WO2010061482A1 - Testing apparatus, serial transmission system, program, and recording medium - Google Patents

Testing apparatus, serial transmission system, program, and recording medium Download PDF

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Publication number
WO2010061482A1
WO2010061482A1 PCT/JP2008/071724 JP2008071724W WO2010061482A1 WO 2010061482 A1 WO2010061482 A1 WO 2010061482A1 JP 2008071724 W JP2008071724 W JP 2008071724W WO 2010061482 A1 WO2010061482 A1 WO 2010061482A1
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WIPO (PCT)
Prior art keywords
transmission
data
unit
expected value
frame
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PCT/JP2008/071724
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French (fr)
Japanese (ja)
Inventor
徳雄 熊木
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株式会社アドバンテスト
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Priority to PCT/JP2008/071724 priority Critical patent/WO2010061482A1/en
Priority to JP2010540283A priority patent/JPWO2010061482A1/en
Publication of WO2010061482A1 publication Critical patent/WO2010061482A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation

Definitions

  • the present invention relates to a test apparatus, a serial transmission system, a program, and a recording medium.
  • the semiconductor test apparatus includes a plurality of test modules. Each test module transmits / receives test data and the like to / from other test modules or a performance board on which a device under test is mounted. The test module performs data transmission through a high-speed serial bus or the like for the purpose of transmitting a large amount of data in a short time.
  • JP 57-145451 A JP 57-145451 A
  • bit error rate In communication between test modules in a semiconductor test apparatus, high reliability with a bit error rate of about 10 ⁇ 17 to 10 ⁇ 19 is required. However, the bit error rate tends to increase with the recent increase in transmission speed.
  • retransmission control As a method for improving the reliability of a transmission path, retransmission control is known in which data to be transmitted / received is framed and a frame in which a bit error occurs is retransmitted.
  • the transmission side can reliably transmit all the transmission data by retransmitting the transmission data that has not been normally received under the control of the CPU or the like.
  • retransmission control using a CPU or the like is performed in a semiconductor test apparatus that tests devices in a multitasking environment, there is a problem that the efficiency of device testing is reduced due to fluctuations in the load on the CPU.
  • an object of one aspect of the present invention is to provide a test apparatus, a serial transmission system, a program, and a recording medium that can solve the above-described problems. This object is achieved by a combination of features described in the independent claims.
  • the dependent claims define further advantageous specific examples of the present invention.
  • a test apparatus for testing a device under test which is electrically connected to the device under test and tests the device under test, A control unit that controls the test unit; and a serial transmission unit that transmits transmission data between the control unit and the test unit.
  • the serial transmission unit receives the transmission data when the transmission side receives the transmission data.
  • a reception notification unit that transmits a confirmation signal indicating that the transmission data has been transmitted to the transmission side, and reception from the transmission side when the transmission data is not received within a predetermined period after transmission data is transmitted on the transmission side.
  • a test apparatus having a retransmission control unit for retransmitting the transmission data on the side is provided.
  • a serial transmission system for transmitting transmission data between a reception side and a transmission side, and when transmission data is received at the reception side, confirmation that the transmission data has been received
  • a reception notifying unit for transmitting a signal to the transmission side, and transmission from the transmission side to the reception side when the transmission data is transmitted on the transmission side and a confirmation signal of the transmission data is not received within a predetermined period.
  • a serial transmission system including a retransmission control unit that retransmits data is provided.
  • a program for causing a test apparatus for testing a device under test to function Functions as a control unit that controls the test unit and a serial transmission unit that transmits transmission data between the control unit and the test unit.
  • the serial transmission unit receives transmission data on the receiving side, it receives the transmission data.
  • a reception notification unit that transmits a confirmation signal indicating that the transmission data has been transmitted to the transmission side, and reception from the transmission side when the transmission data is not received within a predetermined period after transmission data is transmitted on the transmission side.
  • a program and a recording medium are provided that function as a retransmission control unit that retransmits the transmission data.
  • FIG. 1 shows a configuration of a semiconductor test apparatus 10 according to the present embodiment.
  • the structure of the serial transmission part 40 is shown.
  • a normal sequence when data is transmitted from the transmission / reception unit 100 to the transmission / reception unit 200 is shown.
  • a sequence when the transmitted DAT frame is lost is shown.
  • a sequence when the ACK frame transmitted by the transmission / reception unit 200 is lost is shown.
  • a sequence when an error has occurred in the ACK frame transmitted by the transmission / reception unit 200 is shown.
  • the 2nd structure of the serial transmission part 40 is shown.
  • a sequence in the case of transmitting a plurality of frames in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200 is shown.
  • a timing sequence during normal operation when the transmission / reception unit 100 transmits a plurality of DAT frames to the transmission / reception unit 200 is shown.
  • a timing sequence when the transmission / reception unit 200 cannot normally receive the DAT frame is shown.
  • a timing sequence when the ACK frame transmitted by the transmission / reception unit 200 is lost in the transmission medium 42 is shown.
  • a timing sequence in the case where data is transmitted from the transceiver unit 100 to the transceiver unit 200 is shown.
  • a timing sequence in which the transmission / reception unit 100 retransmits due to timeout when retransmission occurs in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200 is shown.
  • An example of the hardware constitutions of the computer 1900 which concerns on 2nd Embodiment is shown.
  • FIG. 1 shows a configuration of a semiconductor test apparatus 10 according to the present embodiment together with a device under test 50.
  • the semiconductor test apparatus 10 includes a control unit 20, a plurality of test units 30, and a plurality of serial transmission units 40.
  • the control unit 20 controls a plurality of test units 30 by executing a plurality of test control programs 22 and the like given in advance, thereby controlling tests on a plurality of devices under test 50.
  • the control unit 20 may include a CPU, for example.
  • the plurality of test units 30 are provided corresponding to the plurality of devices under test 50 or the plurality of pins of the device under test 50.
  • the control unit 20 may control these test units 30 to test a plurality of devices under test 50 in parallel.
  • Each test unit 30 is electrically connected to the device under test and tests the device under test. For example, each test unit 30 may generate data used for testing the device under test and analyze data output from the device under test.
  • the serial transmission unit 40 includes a transmission medium 42, a transmission / reception unit 100, and a transmission / reception unit 200.
  • the transmission / reception unit 100 may be provided at the end of the transmission medium 42 on the control unit 20 side.
  • the transmission / reception unit 200 may be provided at the end of the transmission medium 42 on the test unit 30 side.
  • the transmission / reception unit 100 and the transmission / reception unit 200 transmit transmission data between the control unit 20 and the test unit 30 via the transmission medium 42.
  • the transmission / reception unit 100 and the transmission / reception unit 200 cannot normally transmit / receive transmission data between the control unit 20 and the test unit 30, the transmission / reception unit 100 and the transmission / reception unit 200 restore the transmission data without being controlled by the control unit 20. Thereby, when a transmission error occurs, the transmission data can be recovered without increasing the load on the control unit 20 executing the multitask.
  • the transmission / reception unit 100 and the transmission / reception unit 200 may detect and recover a transmission error by hardware.
  • FIG. 2 shows the configuration of the serial transmission unit 40.
  • the transmission / reception unit 100 and the transmission / reception unit 200 of this example receive the transmission data
  • the transmission / reception unit 100 and the transmission / reception unit 200 notify the other party to that effect.
  • the transmission / reception unit that has transmitted the transmission data retransmits the transmission data when the other party is not notified that the transmission data has been received within a predetermined period.
  • the transmission / reception unit 100 includes a data management unit 102, a data transmission unit 104, a multiplexer 106, a data reception unit 108, a reception notification unit 110, and a retransmission control unit 112.
  • the transmission / reception unit 200 includes a data management unit 202, a data transmission unit 204, a multiplexer 206, a data reception unit 208, a reception notification unit 210, and a retransmission control unit 212.
  • the transceiver unit 100 and the transceiver unit 200 may have the same configuration.
  • the corresponding component in the transmission / reception unit 100 and the transmission / reception unit 200 may have the same function.
  • the data management unit 102 controls transmission / reception of transmission frames performed by the transmission / reception unit 100 with the transmission / reception unit 200.
  • a transmission frame a frame type including transmission data such as a test pattern (hereinafter referred to as a DAT frame) and a frame type including a confirmation signal indicating that the transmission data has been received (hereinafter referred to as an ACK frame) Will be described.
  • the data management unit 102 may transmit data input from the control unit 20 to the transmission / reception unit 200 and may output data received from the transmission / reception unit 200 to the control unit 20.
  • the data management unit 102 may include a dual port memory that can be accessed by the control unit 20, the data transmission unit 104, and the data reception unit 108.
  • the data transmission unit 104 assembles a DAT frame with identification data (hereinafter referred to as frame ID) added to the transmission data stored in the data management unit 102.
  • the data transmission unit 104 transmits the DAT frame to the transmission / reception unit 200 via the multiplexer 106.
  • the data transmission unit 104 may change the frame ID attached to the transmission data to be sequentially transmitted according to a predetermined rule for each transmission data.
  • the data transmission unit 104 may attach a frame ID including a number that is sequentially incremented for each transmission data to the transmission data.
  • the DAT frame may include a frame ID, frame type information, transmission data, and FCS (frame check sequence code) for error detection.
  • the data reception unit 108 recognizes the frame type after extracting the frame type information from the transmission frame received from the transmission / reception unit 200. If the received transmission frame is an ACK frame, the data reception unit 108 may output data included in the received ACK frame to the retransmission control unit 112. Further, when the received transmission data is a DAT frame, the data reception unit 108 may notify the reception notification unit 110 of the frame ID in the received DAT frame. Further, the data reception unit 108 may output data included in the received DAT frame to the data management unit 102.
  • the reception notification unit 110 When the data reception unit 108 receives a DAT frame from the transmission / reception unit 200, the reception notification unit 110 receives at least a part of data included in the DAT frame received by the data reception unit 108 from the data reception unit 108, An ACK frame indicating that the transmission data has been received is transmitted to the transmission / reception unit 200.
  • the reception notification unit 110 may generate an ACK frame with the same frame ID as the frame ID included in the data received from the data reception unit 108 and output the ACK frame to the multiplexer 106.
  • the multiplexer 106 may transmit the DAT frame output from the data transmission unit 104 or the ACK frame output from the reception notification unit 110 to the transmission / reception unit 200.
  • the retransmission control unit 112 controls the transmission order of DAT frames transmitted to the transmission / reception unit 200.
  • the retransmission control unit 112 receives data included in the ACK frame.
  • the data transmission unit 104 does not receive an ACK frame corresponding to the DAT frame within a predetermined period after the data transmission unit 104 transmits the DAT frame
  • the retransmission control unit 112 transmits the data transmission unit 104 to the transmission / reception unit 200.
  • the DAT frame may be retransmitted.
  • the retransmission control unit 112 may notify the data transmission unit 104 of the frame ID to be retransmitted.
  • the data transmission unit 104 may read the data to be retransmitted from the data management unit 102, attach the frame ID notified from the retransmission control unit 112 to the data, and transmit the data to the transmission / reception unit 200. .
  • the retransmission control unit 112 transmits the transmission data transmitted immediately before until the data to be transmitted next is given to the data transmission unit 104.
  • the transmission / reception unit 200 may continue to retransmit.
  • the retransmission control unit 112 may generate a frame ID according to a predetermined rule and notify the data transmission unit 104 of the frame ID.
  • the data transmission unit 104 may be notified to retransmit the DAT frame that has already been transmitted to the transmission / reception unit 200. .
  • the transmission / reception unit 200 includes a data management unit 202, a data transmission unit 204, a multiplexer 206, a data reception unit 208, a reception notification unit 210, and a retransmission control unit 212. Transmission and reception and ACK frame transmission and reception may be performed.
  • the transmission / reception unit 200 may transmit the data input from the test unit 30 to the transmission / reception unit 100, and may output the data received from the transmission / reception unit 100 to the test unit 30.
  • FIG. 3 shows a normal sequence when data is transmitted from the transmission / reception unit 100 to the transmission / reception unit 200.
  • the transmission / reception unit 100 will be described as a DAT frame transmission side and the transmission / reception unit 200 will be described as an ACK frame transmission side. However, even if the transmission / reception unit 200 operates as a DAT frame transmission side and the transmission / reception unit 100 operates as an ACK frame transmission side. Good. Further, the transmission / reception unit 100 and the transmission / reception unit 200 may transmit the DAT frame while receiving the DAT frame.
  • the data reception unit 208 receives the DAT frame (S201).
  • the data reception unit 208 outputs transmission data and the like included in the received DAT frame to the data management unit 202 (S202).
  • the data receiving unit 208 may output the transmission data and the frame ID to the data management unit 202.
  • the data receiving unit 208 notifies the reception notifying unit 210 that the transmission data has been received.
  • the data reception unit 208 may notify the reception notification unit 210 of the frame ID included in the DAT frame.
  • the reception notification unit 210 transmits an ACK frame for the received DAT frame to the transmission / reception unit 100 based on the notification received from the data reception unit 208 (S203).
  • the reception notification unit 210 may transmit an ACK frame including the same frame ID as the frame ID received from the data reception unit 208 to the transmission / reception unit 100.
  • the data reception unit 108 receives the ACK frame (S102).
  • the transmission / reception unit 100 recognizes that the transmission data corresponding to the frame ID has reached the transmission / reception unit 200 by confirming the frame ID included in the received ACK frame.
  • FIG. 4 shows a sequence when the transmitted DAT frame is lost in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200.
  • the transmission / reception unit 100 transmits a DAT frame (S301), but the transmitted DAT frame disappears in the transmission medium 42 (S401), the transmission / reception unit 200 outputs data to the data management unit 202 (S402). ) And transmission of the ACK frame to the transmission / reception unit 100 (S403) cannot be performed.
  • the transmission / reception unit 100 performs normal transmission / reception of the DAT frame. You may judge that it was not. For example, the transmission / reception unit 100 may measure the elapsed time after transmitting the DAT frame to the transmission / reception unit 200 for each DAT frame. When a predetermined time has passed since any DAT frame is transmitted to the transmission / reception unit 200 (S302), the retransmission control unit 112 causes the data transmission unit 104 to retransmit the DAT frame (S303). ).
  • the transmission / reception unit 200 When the transmission / reception unit 200 receives the retransmitted DAT frame (S404), the data reception unit 208 outputs the received data to the data management unit 202 (S405), and also sends the transmission / reception unit 100 to the retransmission frame.
  • An ACK frame is transmitted (S406).
  • the transmission / reception unit 100 receives the ACK frame for the retransmission frame (S304), recognizes that the retransmitted data has reached the transmission / reception unit 200, and ends transmission of the DAT frame to the transmission / reception unit 200.
  • the DAT frame disappearance has been described as an example. However, even when an error occurs in the DAT frame received by the transmission / reception unit 200, the transmission / reception unit 100 and the transmission / reception unit 200 may perform the same processing. . In this case, the data reception unit 208 may detect an error by calculating an FCS (frame check sequence) added to the DAT frame.
  • FCS frame check sequence
  • the data reception unit 208 When an error occurs in the DAT frame, the data reception unit 208 does not notify the reception notification unit 210 that the DAT frame has been received. For this reason, the transmission / reception unit 100 cannot receive an ACK frame corresponding to the DAT frame, and retransmits the DAT frame.
  • the data management unit 202 may discard the DAT frame. Note that when the data receiving unit 208 detects that there is an error in the DAT frame, the data receiving unit 208 may transmit a frame including a confirmation signal indicating that the error has been detected to the transmission / reception unit 100.
  • FIG. 5 shows a sequence when an ACK frame transmitted by the transmission / reception unit 200 is lost in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200.
  • the transmission / reception unit 100 transmits a DAT frame (S501).
  • the data reception unit 208 When receiving the DAT frame (S601), the data reception unit 208 outputs the data included in the received DAT frame to the data management unit 202 (S602).
  • the reception notifying unit 210 transmits an ACK frame to the transmission / reception unit 100 (S603).
  • the transmission / reception unit 100 cannot receive the ACK frame (S502).
  • the retransmission control unit 112 transmits the data to the data transmission unit 104 in S501.
  • the retransmitted DAT frame is retransmitted (S504).
  • the transmission / reception unit 100 receives an ACK frame for the retransmitted DAT frame by the same sequence as in FIG. 4, and the transmission of data from the transmission / reception unit 100 to the transmission / reception unit 200 ends (S505).
  • the transmission / reception unit 200 receives the same DAT frame a plurality of times (S604).
  • the data management unit 202 may discard the transmission data with the same frame ID as the already stored transmission data (S605).
  • FIG. 6 shows a sequence in the case where an error has occurred in the ACK frame transmitted by the transmission / reception unit 200 in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200.
  • the transmission / reception unit 200 When receiving the DAT frame transmitted by the transmission / reception unit 100 (S801), the transmission / reception unit 200 outputs transmission data included in the received DAT frame to the data management unit 202 (S802). Further, the transmission / reception unit 200 transmits an ACK frame for the received DAT frame (S803).
  • the transmission / reception unit 100 receives the ACK frame at the data reception unit 108, but may detect that an error has occurred in the received ACK frame (S702).
  • the data receiving unit 108 may detect an error by calculating an FCS (frame check sequence) added to the ACK frame.
  • FCS frame check sequence
  • the data reception unit 108 may have an error in the frame ID included in the ACK frame, so which DAT frame the ACK frame corresponds to Cannot be determined. For this reason, the data receiving unit 108 ignores the ACK frame. As a result, the data receiving unit 108 determines that the ACK frame for the ACK frame corresponding to the ACK frame has not been received within a predetermined period, and notifies the retransmission control unit 112 to that effect.
  • the retransmission control unit 112 instructs the data transmission unit 104 to retransmit a DAT frame that has not received an ACK frame within a predetermined period based on the notification from the data reception unit 108 (S703). Thereafter, the transmission / reception unit 100 receives the ACK frame for the retransmitted DAT frame by the same sequence as in FIG. 4, and the transmission of the DAT frame from the transmission / reception unit 100 to the transmission / reception unit 200 ends (S704).
  • the transmission / reception unit 200 receives the same DAT frame a plurality of times (S804).
  • the data management unit 202 may discard the transmission data with the same frame ID as the already stored transmission data (S805).
  • FIG. 7 shows a second configuration of the serial transmission unit 40.
  • the transmission / reception unit 100 further includes an expected ID value comparison unit 114, an expected ID value update unit 116, and an expected ID value storage unit 118 in addition to the configuration shown in FIG.
  • the transmission / reception unit 200 further includes an expected ID value comparison unit 214, an expected ID value update unit 216, and an expected ID value storage unit 218.
  • the corresponding components in the transmission / reception unit 100 and the transmission / reception unit 200 may have the same function.
  • the ID expected value storage unit 118 stores the expected value of the frame ID attached to the transmission data received by the data receiving unit 108.
  • the expected ID value storage unit 118 may store the expected value of the frame ID for each frame type.
  • the expected ID value storage unit 118 may function as a data ID expected value storage unit that stores an expected DAT frame ID value for a DAT frame, and an expected ACK frame ID value for an ACK frame. It may function as a confirmation ID expected value storage unit to be stored. Further, the expected ID value storage unit 118 may update the expected value to be stored under the control of the expected ID value update unit 116.
  • the ID expected value comparison unit 114 compares the frame ID attached to the transmission data received by the data receiving unit 108 with the expected value stored in the ID expected value storage unit 118.
  • the expected ID value comparison unit 114 may compare the frame ID and the expected value for each frame type.
  • the expected ID value comparison unit 114 may function as a data ID expected value comparison unit that compares a frame ID with an expected DAT frame ID value for a DAT frame, and a frame ID for an ACK frame.
  • an ACK frame ID may function as a confirmation ID expected value comparison unit.
  • the ID expected value update unit 116 receives the comparison result from the ID expected value comparison unit 114. Also, the ID expected value update unit 116, when the frame ID attached to the transmission data received by the data receiving unit 108 matches the expected value stored in the ID expected value storage unit 118, The expected value stored in the storage unit 118 is updated based on a predetermined rule.
  • the expected ID value updating unit 116 may update the expected value for each frame type. For example, the expected ID value update unit 116 may function as a data ID expected value update unit that updates the expected DAT frame ID value for the DAT frame, and the expected ACK frame ID value for the ACK frame. It may function as a confirmation ID expected value update unit to be updated.
  • the expected ID value updating unit 116 may update each expected ID value by incrementing the ID value by one. More specifically, when the frame ID of the latest DAT frame received by the data reception unit 108 from the transmission / reception unit 200 is “2”, the frame ID of the DAT frame to be received next is “3”. Therefore, the expected ID value storage unit 118 stores “3” as the expected DAT frame ID value to be received.
  • the ID expected value comparison unit 114 informs the ID expected value update unit 116 that the comparison results match. Notice. If the comparison result matches, the ID expected value update unit 116 may instruct the ID expected value storage unit 118 to update the stored DAT frame ID expected value to “4”. .
  • the expected ID value storage unit 118 updates the stored DAT frame ID expected value to “4” based on an instruction from the expected ID value update unit 116.
  • the ID expected value comparison unit 114 notifies the ID expected value update unit 116 that the comparison results do not match. . If the comparison result does not match, the ID expected value update unit 116 does not output an instruction to update the stored DAT frame ID expected value to the ID expected value storage unit 118.
  • the ID expected value comparison unit 114 may notify the data reception unit 108 of the comparison result. Based on the comparison result received from the ID expected value comparison unit 114, the data reception unit 108 may control whether or not to output data included in the received transmission data to a subsequent circuit. For example, the data reception unit 108, when the frame ID of the DAT frame received from the transmission / reception unit 200 is different from the frame ID determined by a predetermined rule based on the comparison result received from the ID expected value comparison unit 114, The output of transmission data to the data management unit 102 may be stopped. Further, the data receiving unit 108 may resume outputting the transmission data to the data management unit 102 when receiving transmission data with a frame ID determined by a predetermined rule.
  • the data reception unit 108 when receiving a notification from the expected ID value comparison unit 114 that the frame ID of the received DAT frame is different from the expected DAT frame ID value, the data reception unit 108 outputs the received data to the data management unit 102. You can discard it without doing it. In addition, when receiving a notification from the expected ID value comparison unit 114 that the frame ID of the received DAT frame matches the expected DAT frame ID value, the data reception unit 108 sends the received data to the data management unit 102. May be output.
  • the data receiving unit 108 discards the transmission data included in the received DAT frame again when the DAT frame having the same frame ID as the frame ID of the ACK frame transmitted by the reception notifying unit 110 is received again. You can do it. Further, the reception notifying unit 110 may transmit an ACK frame for the DAT frame received again to the transmission / reception unit 200.
  • FIG. 8 shows a sequence in the case of transmitting a plurality of DAT frames in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200.
  • the transmission / reception unit 100 transmits a DAT frame 0 (a frame whose frame ID is “0”) (S901).
  • the data receiving unit 208 acquires the frame ID “0” attached to the received frame.
  • the data reception unit 208 notifies the reception notification unit 210 of the acquired frame ID. Furthermore, the data reception unit 208 instructs the reception notification unit 210 to transmit an ACK frame with the notified frame ID to the transmission / reception unit 100. The reception notification unit 210 transmits ACK frame 0 to the transmission / reception unit 100 based on an instruction from the data reception unit 208 (S1003).
  • the data reception unit 208 outputs the acquired frame ID to the ID expected value comparison unit 214.
  • the expected ID value comparison unit 214 reads the expected DAT frame ID value stored in the expected ID value storage unit 218 and compares it with the frame ID received from the data reception unit 208. In the initial state, “0” is stored in the expected ID value storage unit 218 as the expected DAT frame ID value.
  • the ID expected value comparison unit 214 uses the DAT frame in which the frame ID received from the data reception unit 208 is stored in the ID expected value storage unit 218. It is determined that the ID matches the expected value. The expected ID value comparison unit 214 notifies the data reception unit 208 and the expected ID value update unit 216 of the result of comparing the frame IDs.
  • the expected ID value updating unit 216 determines that normal transmission data has been received because the comparison results match, and updates the expected DAT frame ID value stored in the expected ID value storage unit 218 to “1”. .
  • the data reception unit 208 determines that normal transmission data has been received, and outputs the received transmission data to the data management unit 202 (S1002).
  • the transmission / reception unit 100 transmits DAT frame 1 and DAT frame 2 following DAT frame 0 (S902, S903). However, in this example, the DAT frame 1 is lost in the transmission medium 42 (S1004). Therefore, the data receiving unit 208 receives the DAT frame 2 without receiving the DAT frame 1 (S1005).
  • the data receiving unit 208 When receiving the DAT frame 2, the data receiving unit 208 acquires the frame ID “2” attached to the received frame, and outputs the frame ID “2” to the reception notifying unit 210 and the expected ID value comparing unit 214.
  • the reception notification unit 210 transmits the ACK frame 2 to the transmission / reception unit 100 (S1007).
  • the expected ID value comparison unit 214 compares the expected DAT frame ID value “1” stored in the expected ID value storage unit 218 with the frame ID “2” received from the data reception unit 208.
  • the expected ID value comparison unit 214 notifies the data reception unit 208 and the expected ID value update unit 216 that the comparison results do not match.
  • the data receiving unit 208 determines that normal transmission data has not been received, and stops outputting the received transmission data to the data management unit 202 (S1006). Further, the expected ID value updating unit 216 does not update the expected value stored in the expected ID value storage unit 218 because the comparison results do not match.
  • the retransmission control unit 112 instructs the data transmission unit 104 to repeat retransmission of the DAT frame 2 when the data management unit 102 does not have the transmission data to be transmitted next after the transmission of the DAT frame 2. (S904, S906, S907). In the meantime, the data receiving unit 108 receives the ACK frame 0 transmitted by the transmitting / receiving unit 200 (S908).
  • the data receiving unit 108 acquires the frame ID “0” from the received ACK frame 0.
  • the data reception unit 108 outputs the acquired frame ID to the ID expected value comparison unit 114.
  • the expected ID value comparison unit 114 reads the expected value of the frame ID for the ACK frame stored in the expected ID value storage unit 118 and compares it with the frame ID received from the data reception unit 108.
  • the expected ID value comparison unit 114 determines that the frame ID received from the data reception unit 108 matches the expected ACKID frame value stored in the expected ID value storage unit 118.
  • the expected ID value comparison unit 114 notifies the data reception unit 108 and the expected ID value update unit 116 of the result of comparing the frame IDs.
  • the expected ID value update unit 116 determines that the expected ACK frame has been received because the comparison results match, and sets the expected ACK frame ID value stored in the expected ID value storage unit 118 to “1”. Update.
  • the data reception unit 108 notifies the retransmission control unit 112 that the comparison results match.
  • the retransmission control unit 112 recognizes that the transmitted DAT frame 0 has reached the transmission / reception unit 200 and does not retransmit the DAT frame 0.
  • the data receiving unit 208 receives the ACK frame 2.
  • the data receiving unit 108 acquires the frame ID “2” from the received ACK frame 2.
  • the data reception unit 108 outputs the acquired frame ID to the ID expected value comparison unit 114.
  • the expected ID value comparison unit 114 reads the expected ACK frame ID value stored in the expected ID value storage unit 118 and compares it with the frame ID received from the data reception unit 108.
  • the expected ID storage unit 118 stores “1” as the expected DAT frame ID. Therefore, the expected ID value comparison unit 114 determines that the frame ID “2” received from the data reception unit 108 does not match the expected ACK frame ID value “1” stored in the expected ID value storage unit 118. The expected ID value comparison unit 114 notifies the data reception unit 108 and the expected ID value update unit 116 of the result of comparing the frame IDs. The expected ID value update unit 116 does not update the expected ACK frame ID value stored in the expected ID value storage unit 118 because the comparison result does not match.
  • the data receiving unit 108 notifies the retransmission control unit 112 that the frame ID of the received ACK frame 2 does not match the expected ACK frame ID value.
  • the retransmission control unit 112 recognizes that it is necessary to retransmit the DAT frame 1 based on the notification from the data receiving unit 108. Therefore, the retransmission control unit 112 instructs the data transmission unit 104 to retransmit the DAT frame 1.
  • the data transmission unit 104 acquires transmission data transmitted by the DAT frame 1 from the data management unit 102 based on an instruction from the retransmission control unit 112. Further, the data transmission unit 104 assembles the DAT frame 1 with the frame ID “1” added to the transmission data acquired from the data management unit 102, and retransmits the DAT frame 1 to the transmission / reception unit 200 (S909). The retransmission control unit 112 may further cause the data transmission unit 104 to transmit the DAT frame 2 and the DAT frame 3 (S910, S911).
  • the data receiving unit 208 receives the DAT frame 1 retransmitted by the data transmitting unit 104 (S1014). When receiving the DAT frame 1, the data receiving unit 208 acquires the frame ID “1” attached to the received frame.
  • the data reception unit 208 notifies the reception notification unit 210 of the acquired frame ID and instructs the transmission / reception unit 100 to transmit an ACK frame with the acquired frame ID.
  • the reception notification unit 210 transmits ACK frame 1 to the transmission / reception unit 100 based on the instruction of the data reception unit 208 (S1016).
  • the data reception unit 208 outputs the acquired frame ID to the ID expected value comparison unit 214.
  • the expected ID value comparison unit 214 reads the expected DAT frame ID value stored in the expected ID value storage unit 218 and compares it with the frame ID received from the data reception unit 208.
  • the expected ID value storage unit 218 stores “1” as the expected DAT frame ID value.
  • the expected ID value comparison unit 214 determines that the frame ID “1” received from the data reception unit 208 matches the expected DAT frame ID value “1” stored in the expected ID value storage unit 218.
  • the expected ID value comparison unit 214 notifies the data reception unit 208 and the expected ID value update unit 216 of the result of comparing the frame IDs.
  • the ID expected value update unit 216 determines that the normal transmission data has been received because the comparison results match, and updates the expected value stored in the ID expected value storage unit 218 to “2”. Further, since the comparison results match, the data reception unit 208 determines that normal transmission data has been received, and outputs the received transmission data to the data management unit 202. Thereafter, the data reception unit 208 may perform the same processing on the received DAT frame 2 and DAT frame 3 and output the received transmission data to the data management unit 202.
  • FIG. 9 shows a timing sequence during normal operation when the transmission / reception unit 100 transmits a plurality of DAT frames to the transmission / reception unit 200.
  • the “frame period” indicates the time for transmitting the maximum length frame.
  • the transmission / reception unit 100 and the transmission / reception unit 200 may transmit / receive the DAT frame and the ACK frame at intervals of the frame period regardless of the frame length of the frame to be transmitted.
  • the “transmission side data write” signal is a signal for the control unit 20 to write data to the data management unit 102.
  • the control unit 20 may change the “transmission side data write” signal to the H level and write the data to the data management unit 102 when there is “empty” in which the data management unit 102 writes the data.
  • the retransmission control unit 112 controls the order in which DAT frames are transmitted based on the ACK frame.
  • the retransmission control unit 112 instructs the data transmission unit 104 to transmit a DAT frame including new transmission data when the expected value of the ACK frame ID matches the frame ID of the received ACK frame. May be issued.
  • the data transmission unit 104 may read the transmission data from the data management unit 102 and generate a DAT frame and transmit it to the transmission / reception unit 200.
  • the retransmission control unit 112 instructs the data transmission unit 104 to retransmit the DAT frame transmitted immediately before. Good.
  • the data transmission unit 104 transmits the DAT frame 0 over a 4-frame period.
  • T101 when the transmission side data write signal becomes H level and data is written to the data management unit 102, the data transmission unit 104 transmits a DAT frame with the frame ID “1”. Similarly, the data transmission unit 104 may update the transmission side DAT frame ID and transmit a DAT frame each time data is written in the data management unit 102.
  • “Expected ACK frame ID value” indicates the expected frame ID value for the ACK frame stored in the expected ID value storage unit 118.
  • the “ACK frame ID incoming value” indicates the frame ID attached to the ACK frame received from the transmission / reception unit 200 by the data reception unit 108.
  • the ACK frame ID return value indicates the frame ID attached to the ACK frame transmitted from the transmission / reception unit 200 to the transmission / reception unit 100.
  • “Received DAT frame” indicates a DAT frame received by the transmission / reception unit 200.
  • the reason why the “reception DAT frame” is delayed by about three frame periods from the “transmission DAT frame” is a transmission delay that occurs in the transmission medium 42 between the transmission / reception unit 100 and the transmission / reception unit 200.
  • the “DAT frame ID expected value” is an expected DAT frame ID value stored in the expected ID value storage unit 218.
  • “Receiver side data output” indicates data output to the data management unit 202 by the data receiving unit 208 that has received the DAT frame.
  • the DAT frame 1 transmitted by the data transmission unit 104 at T101 is received by the data reception unit 208 at T102.
  • the data reception unit 208 acquires the frame ID “1” from the received DAT frame 1 and notifies the ID expected value comparison unit 214 of the acquired frame ID.
  • the expected ID value comparison unit 214 compares the expected DAT frame ID value stored in the expected ID value storage unit 218.
  • the expected ID value comparison unit 214 notifies the data reception unit 208 and the expected ID value update unit 216 of the comparison result.
  • the ID expected value update unit 216 receives the notification of the comparison result and updates the DAT frame ID expected value stored in the ID expected value storage unit 218 to “2”.
  • the data reception unit 208 outputs the transmission data included in the received DAT frame 1 to the data management unit 202. Further, the data receiving unit 208 instructs the reception notifying unit 210 to transmit ACK frame 1.
  • the reception notification unit 210 transmits the ACK frame 1 based on the instruction from the data reception unit 208. Further, the data reception unit 208 may output the data included in the received DAT frame 1 to the data management unit 202 (T103).
  • the data receiving unit 108 receives the ACK frame 1 transmitted by the reception notifying unit 210.
  • the data reception unit 108 acquires the frame ID “1” from the received ACK frame 1 and notifies the ID expected value comparison unit 114 of the acquired frame ID.
  • the expected ID value comparison unit 114 compares the expected ACK frame ID value stored in the expected ID value storage unit 118.
  • the ID expected value comparison unit 114 notifies the data reception unit 108 and the ID expected value update unit 116 of the comparison result.
  • the expected ID value update unit 116 updates the expected ACK frame ID value stored in the expected ID value storage unit 118 to “2” (T104). Thereafter, the transmission / reception unit 100 can continuously transmit a plurality of DAT frames by repeating the same procedure.
  • FIG. 10 shows a timing sequence when the transmission / reception unit 200 cannot normally receive the DAT frame in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200.
  • the DAT frame 4 transmitted by the transmission / reception unit 100 is lost in the transmission medium 42 (T111).
  • the data receiving unit 208 should receive the DAT frame 4, but has received the DAT frame 5 in the next frame period due to the disappearance of the DAT frame 4.
  • the data receiving unit 208 When receiving the DAT frame 5, the data receiving unit 208 acquires the frame ID “5” from the received DAT frame 5. The data reception unit 208 outputs the acquired frame ID to the ID expected value comparison unit 214.
  • the expected ID value comparison unit 214 compares the expected DAT frame ID value “4” stored in the expected ID value storage unit 218 and notifies the expected ID value update unit 216 of the comparison result.
  • the expected ID value updating unit 216 does not update the expected value stored in the expected ID value storage unit 218 because the comparison results do not match.
  • the data reception unit 208 notifies the reception notification unit 210 that the DAT frame 5 has been received.
  • the reception notification unit 210 transmits the ACK frame 5 to the transmission / reception unit 100 based on the notification from the data reception unit 208.
  • the data receiving unit 108 acquires the frame ID “5” from the received ACK frame 5.
  • the data reception unit 108 outputs the acquired frame ID to the ID expected value comparison unit 114.
  • the expected ID value comparison unit 114 compares the expected ACK frame ID value “4” stored in the expected ID value storage unit 118 and notifies the data reception unit 108 and the expected ID value update unit 116 of the comparison result ( T112).
  • the expected ID value update unit 116 does not update the expected value stored in the expected ID value storage unit 118.
  • the data reception unit 108 notifies the retransmission control unit 112 that the comparison results do not match. Based on the notification, the retransmission control unit 112 determines that the DAT frame 4 needs to be retransmitted, and requests the data transmission unit 104 to retransmit the DAT frame 4.
  • the data transmission unit 104 reads the data of the DAT frame 4 from the data management unit 102, generates the DAT frame 4 with the frame ID “4”, and transmits the data to the transmission / reception unit 200.
  • the data reception unit 208 receives the DAT frame 4 at T113 and outputs the transmission data included in the received DAT frame 4 to the data management unit 202.
  • the transmission / reception unit 100 can quickly detect that the transmitted DAT frame 4 has not arrived at the transmission / reception unit 200 and retransmit the DAT frame 4.
  • FIG. 11 shows a timing sequence when the ACK frame transmitted by the transmission / reception unit 200 disappears in the transmission medium 42 in the data transmission from the transmission / reception unit 100 to the transmission / reception unit 200.
  • the transmission / reception unit 200 normally receives DAT frame 0 to DAT frame 8. Therefore, the data reception unit 208 outputs the received transmission data to the data management unit 202.
  • the ACK frame 4 transmitted by the transmission / reception unit 200 at T121 is lost in the transmission medium 42.
  • the data receiving unit 108 receives the ACK frame 5 after receiving the ACK frame 3.
  • the transmission / reception unit 100 retransmits the DAT frame 4.
  • the data receiving unit 208 receives the DAT frame 4 and acquires the frame ID “4”.
  • FIG. 12 shows a timing sequence when data is transmitted from the transmission / reception unit 100 to the transmission / reception unit 200.
  • the unit of numerical values in the figure is microseconds.
  • the data transmission rate is 800 Mbps (100 MHz ⁇ 1 Byte)
  • the frame data length is 2048 Kbit (256 Bytes).
  • the time required to transmit one frame is 2.56 microseconds.
  • the transmission delay time from when the transmission / reception unit 100 transmits the DAT frame to when the transmission / reception unit 200 receives the DAT frame is 3 microseconds. Based on the above conditions, in FIG. 12, the transmission / reception unit 200 detects the leading portion of the DAT frame A at T201 three microseconds after the transmission / reception unit 100 starts transmitting the DAT frame A.
  • the transmission / reception unit 200 transmits an ACK frame to the transmission / reception unit 100 when detecting a frame ID in T202.
  • the transmission / reception unit 100 receives the ACK frame transmitted by the transmission / reception unit 100 at T205.
  • the transmission / reception unit 200 may transmit a NACK frame including a confirmation signal notifying the occurrence of the error at T204.
  • the transmission / reception unit 100 receives the NACK frame at T206.
  • the transmitting / receiving unit 100 transmits DAT frames B, C, and D at time T206.
  • the transmission / reception unit 100 may stop transmission of the DAT frame E scheduled to be transmitted next and retransmit the DAT frame having the frame ID indicated by the NACK frame.
  • the transmission / reception unit 200 may discard them.
  • FIG. 13 shows a timing sequence in which the transmission / reception unit 100 retransmits due to timeout when retransmission occurs in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200.
  • the DAT frame A is lost in the transmission medium 42 and the transmission / reception unit 200 cannot receive the DAT frame A.
  • the numerical values in the figure indicate the number of delay circuits included in the transmission / reception unit 100 and the transmission / reception unit 200.
  • a one-stage delay circuit causes a delay of 10 nanoseconds. Therefore, when the number of delay stages is 300, it indicates that a delay of 3 microseconds occurs.
  • the “waiting for retransmission” signal is a signal indicating that the data receiving unit 208 is in a waiting state for retransmission.
  • the data reception unit 208 may change the “waiting for retransmission” signal to the H level when the DAT frame expected to be received is not received.
  • the “data output” signal is a signal indicating whether or not the data received by the data reception unit 208 may be output to the data management unit 202.
  • the data reception unit 208 may change the “data output” signal to the L level when the DAT frame expected to be received is not received.
  • the data reception unit 208 may output the transmission data included in the received DAT frame X when the data output signal is at the H level when the DAT frame X is normally received. (T301). Thereafter, the data receiving unit 208 receives the DAT frame B at T303 without receiving the DAT frame A. Since the data reception unit 208 has not received the DAT frame A, the data output signal to the data management unit 202 may be stopped by changing the data output signal to the L level.
  • the data receiving unit 208 may include a buffer that accumulates DAT frames received after the DAT frame B.
  • the transmitting / receiving unit 200 transmits an ACK frame at T302.
  • the transmission / reception unit 100 receives the ACK frame at T304.
  • the transmitting / receiving unit 200 does not transmit an ACK frame for the DAT frame A. Therefore, the transmission / reception unit 100 does not receive an ACK frame at T304.
  • the transmission / reception unit 100 may cause the retransmission control unit 112 to generate a timeout at time T305.
  • the retransmission control unit 112 determines that the DAT frame A needs to be retransmitted, and retransmits the DAT frame A.
  • the retransmission control unit 112 may sequentially generate timeouts for each frame ID of the transmitted DAT frame.
  • the data reception unit 208 completes reception of the DAT frame A at T306.
  • the data receiving unit 208 may output the DAT frames B to F that have already been received and stored in the buffer to the data management unit 202.
  • the data reception unit 208 may output the data of the DAT frame G to the data management unit 202 following the data of the DAT frame F.
  • the transmission / reception unit 100 and the transmission / reception unit 200 quickly detect that the transmitted transmission frame is lost in the transmission medium 42 even when the transmitted DAT frame or ACK frame is lost in the transmission medium 42. it can. Furthermore, the transmission / reception unit 100 and the transmission / reception unit 200 can reliably transmit data even when an error occurs in the transmission medium 42 by retransmitting the DAT frame transmitted according to the detection result. Since the transmission / reception unit 100 and the transmission / reception unit 200 perform the retransmission control, the performance of the control unit 20 is not affected even in a multitasking environment where a plurality of test control programs 22 operate in the control unit 20.
  • the data transmission unit 104 acquires data from the data management unit 102, but the data transmission unit 104 may acquire data from the control unit 20. Although the data received by the data receiving unit 208 is output to the data management unit 202, the data receiving unit 208 may output the received data to the test unit 30.
  • serial transmission unit 40 is connected only to the control unit 20 and the test unit 30.
  • the serial transmission unit 40 can obtain the same effect even in a configuration connected to other serial transmission units.
  • FIG. 14 shows an example of a hardware configuration of a computer 1900 according to the second embodiment.
  • a computer 1900 according to this embodiment is connected to a CPU peripheral unit having a CPU 2000, a RAM 2020, a graphic controller 2075, and a display device 2080 that are connected to each other by a host controller 2082, and to the host controller 2082 by an input / output controller 2084.
  • Input / output unit having communication interface 2030, hard disk drive 2040, and CD-ROM drive 2060, and legacy input / output unit having ROM 2010, flexible disk drive 2050, and input / output chip 2070 connected to input / output controller 2084 With.
  • the host controller 2082 connects the RAM 2020 to the CPU 2000 and the graphic controller 2075 that access the RAM 2020 at a high transfer rate.
  • the CPU 2000 operates based on programs stored in the ROM 2010 and the RAM 2020 and controls each unit.
  • the graphic controller 2075 acquires image data generated by the CPU 2000 or the like on a frame buffer provided in the RAM 2020 and displays it on the display device 2080.
  • the graphic controller 2075 may include a frame buffer for storing image data generated by the CPU 2000 or the like.
  • the input / output controller 2084 connects the host controller 2082 to the communication interface 2030, the hard disk drive 2040, and the CD-ROM drive 2060, which are relatively high-speed input / output devices.
  • the communication interface 2030 communicates with other devices via a network.
  • the hard disk drive 2040 stores programs and data used by the CPU 2000 in the computer 1900.
  • the CD-ROM drive 2060 reads a program or data from the CD-ROM 2095 and provides it to the hard disk drive 2040 via the RAM 2020.
  • the ROM 2010, the flexible disk drive 2050, and the relatively low-speed input / output device of the input / output chip 2070 are connected to the input / output controller 2084.
  • the ROM 2010 stores a boot program that the computer 1900 executes at startup and / or a program that depends on the hardware of the computer 1900.
  • the flexible disk drive 2050 reads a program or data from the flexible disk 2090 and provides it to the hard disk drive 2040 via the RAM 2020.
  • the input / output chip 2070 connects the flexible disk drive 2050 to the input / output controller 2084 and inputs / outputs various input / output devices via, for example, a parallel port, a serial port, a keyboard port, a mouse port, and the like. Connect to controller 2084.
  • the program provided to the hard disk drive 2040 via the RAM 2020 is stored in a recording medium such as the flexible disk 2090, the CD-ROM 2095, or an IC card and provided by the user.
  • the program is read from the recording medium, installed in the hard disk drive 2040 in the computer 1900 via the RAM 2020, and executed by the CPU 2000.
  • a program installed in the computer 1900 and causing the computer 1900 to function as the semiconductor test apparatus 10 causes the computer 1900 to function as the control unit 20, the test unit 30, and the serial transmission unit 40.
  • the program sends a confirmation signal indicating that the transmission data has been received to the transmission side, and after transmitting the transmission data on the transmission side.
  • a retransmission control module for retransmitting the transmission data from the transmission side to the reception side when the confirmation signal of the transmission data is not received within a predetermined period.
  • the information processing described in these programs is read into the computer 1900, whereby the reception notification unit 110 and the retransmission control unit 112, which are specific means in which the software and the various hardware resources described above cooperate. Function as. And the specific semiconductor test apparatus 10 according to the use purpose is constructed
  • the CPU 2000 executes a communication program loaded on the RAM 2020 and executes a communication interface based on the processing content described in the communication program.
  • a communication process is instructed to 2030.
  • the communication interface 2030 reads transmission data stored in a transmission buffer area or the like provided on a storage device such as the RAM 2020, the hard disk drive 2040, the flexible disk 2090, or the CD-ROM 2095, and sends it to the network.
  • the reception data transmitted or received from the network is written into a reception buffer area or the like provided on the storage device.
  • the communication interface 2030 may transfer transmission / reception data to / from the storage device by a DMA (direct memory access) method. Instead, the CPU 2000 transfers the storage device or the communication interface 2030 as a transfer source.
  • the transmission / reception data may be transferred by reading the data from the data and writing the data to the communication interface 2030 or the storage device of the transfer destination.
  • the CPU 2000 is all or necessary from among files or databases stored in an external storage device such as a hard disk drive 2040, a CD-ROM drive 2060 (CD-ROM 2095), and a flexible disk drive 2050 (flexible disk 2090). This portion is read into the RAM 2020 by DMA transfer or the like, and various processes are performed on the data on the RAM 2020. Then, CPU 2000 writes the processed data back to the external storage device by DMA transfer or the like.
  • an external storage device such as a hard disk drive 2040, a CD-ROM drive 2060 (CD-ROM 2095), and a flexible disk drive 2050 (flexible disk 2090).
  • the RAM 2020 and the external storage device are collectively referred to as a memory, a storage unit, or a storage device.
  • Various types of information such as various programs, data, tables, and databases in the present embodiment are stored on such a storage device and are subjected to information processing.
  • the CPU 2000 can also store a part of the RAM 2020 in the cache memory and perform reading and writing on the cache memory. Even in such a form, the cache memory bears a part of the function of the RAM 2020. Therefore, in the present embodiment, the cache memory is also included in the RAM 2020, the memory, and / or the storage device unless otherwise indicated. To do.
  • the CPU 2000 performs various operations, such as various operations, information processing, condition determination, information search / replacement, etc., described in the present embodiment, specified for the data read from the RAM 2020 by the instruction sequence of the program. Is written back to the RAM 2020. For example, when performing the condition determination, the CPU 2000 determines whether the various variables shown in the present embodiment satisfy the conditions such as large, small, above, below, equal, etc., compared to other variables or constants. When the condition is satisfied (or not satisfied), the program branches to a different instruction sequence or calls a subroutine.
  • the CPU 2000 can search for information stored in a file or database in the storage device. For example, in the case where a plurality of entries in which the attribute value of the second attribute is associated with the attribute value of the first attribute are stored in the storage device, the CPU 2000 displays the plurality of entries stored in the storage device. The entry that matches the condition in which the attribute value of the first attribute is specified is retrieved, and the attribute value of the second attribute that is stored in the entry is read, thereby associating with the first attribute that satisfies the predetermined condition The attribute value of the specified second attribute can be obtained.
  • the program or module shown above may be stored in an external recording medium.
  • an optical recording medium such as DVD or CD
  • a magneto-optical recording medium such as MO
  • a tape medium such as an IC card, and the like
  • a storage device such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet may be used as a recording medium, and the program may be provided to the computer 1900 via the network.
  • the transmission / reception unit and the transmission / reception unit perform the retransmission control, the performance of the control unit is not affected even in a multitasking environment where a plurality of test control programs operate in the control unit.

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Abstract

A semiconductor testing apparatus provided with serial transmission units each of which transmits transmission data between a testing unit which is connected electrically with a device to be tested to test the device and a control unit which controls the testing unit. The serial transmission unit is provided with a reception reporting section and a retransmission control section. The reception reporting section transmits to the transmission side a confirmation signal to the effect that the transmission data is received, when the reception side receives the transmission data. When the confirmation signal of the transmission data is not received within a predetermined period after the transmission side transmits the transmission data, the retransmission control section controls the transmission side to retransmit the transmission data to the reception side. Therefore, the data can be transmitted and received reliably even when a data error occurs during serial transmission.

Description

試験装置、シリアル伝送システム、プログラム、および、記録媒体Test apparatus, serial transmission system, program, and recording medium
　本発明は、試験装置、シリアル伝送システム、プログラム、および、記録媒体に関する。 The present invention relates to a test apparatus, a serial transmission system, a program, and a recording medium.
　半導体試験装置は、複数の試験モジュールを備える。それぞれの試験モジュールは、他の試験モジュールとの間、あるいは、被試験デバイスを搭載するパフォーマンスボード等との間で、試験用データ等の送受信を行う。試験モジュールは、大量のデータを短時間で伝送することを目的として、高速シリアルバス等によりデータ伝送を行う。なお、関連する技術文献として、以下の特許文献１を把握している。
特開昭５７－１４５４５１号公報 The semiconductor test apparatus includes a plurality of test modules. Each test module transmits / receives test data and the like to / from other test modules or a performance board on which a device under test is mounted. The test module performs data transmission through a high-speed serial bus or the like for the purpose of transmitting a large amount of data in a short time. In addition, the following patent document 1 is grasped | ascertained as related technical literature.
JP 57-145451 A
　半導体試験装置における試験モジュール間の通信においては、ビット誤り率１０－１７から１０－１９程度の高い信頼性が要求される。ところが、近年の伝送速度の高速化に伴い、ビット誤り率は増える傾向にある。伝送路の信頼性を高める方法として、送受信するデータをフレーム化した上で、ビット誤りの生じたフレームを再送する再送制御が知られている。 In communication between test modules in a semiconductor test apparatus, high reliability with a bit error rate of about 10 −17 to 10 −19 is required. However, the bit error rate tends to increase with the recent increase in transmission speed. As a method for improving the reliability of a transmission path, retransmission control is known in which data to be transmitted / received is framed and a frame in which a bit error occurs is retransmitted.
　送信側は、正常に受信されなかった伝送データを、ＣＰＵ等の制御によって再送することにより、全ての伝送データを確実に送信することができる。ところが、マルチタスク環境下でデバイスを試験する半導体試験装置においてＣＰＵ等を用いた再送制御を行うと、ＣＰＵの負荷が変動することにより、デバイス試験の効率が低下するという課題がある。 The transmission side can reliably transmit all the transmission data by retransmitting the transmission data that has not been normally received under the control of the CPU or the like. However, if retransmission control using a CPU or the like is performed in a semiconductor test apparatus that tests devices in a multitasking environment, there is a problem that the efficiency of device testing is reduced due to fluctuations in the load on the CPU.
　そこで本発明の１つの側面においては、上記の課題を解決することのできる試験装置、シリアル伝送システム、プログラム、および、記録媒体を提供することを目的とする。この目的は請求の範囲における独立項に記載の特徴の組み合わせにより達成される。また従属項は本発明の更なる有利な具体例を規定する。 Therefore, an object of one aspect of the present invention is to provide a test apparatus, a serial transmission system, a program, and a recording medium that can solve the above-described problems. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous specific examples of the present invention.
　上記課題を解決するために、本発明の第１の態様においては、被試験デバイスを試験する試験装置であって、被試験デバイスと電気的に接続され、被試験デバイスを試験する試験ユニットと、試験ユニットを制御する制御部と、制御部および試験ユニットの間で伝送データを伝送するシリアル伝送部とを備え、シリアル伝送部は、受信側において伝送データを受け取った場合に、当該伝送データを受け取った旨の確認信号を送信側に送信する受信通知部と、送信側において伝送データを送信してから、予め定められた期間内に当該伝送データの確認信号を受け取らない場合に、送信側から受信側に当該伝送データを再送させる再送制御部を有する試験装置を提供する。 In order to solve the above-mentioned problems, in a first aspect of the present invention, a test apparatus for testing a device under test, which is electrically connected to the device under test and tests the device under test, A control unit that controls the test unit; and a serial transmission unit that transmits transmission data between the control unit and the test unit. The serial transmission unit receives the transmission data when the transmission side receives the transmission data. A reception notification unit that transmits a confirmation signal indicating that the transmission data has been transmitted to the transmission side, and reception from the transmission side when the transmission data is not received within a predetermined period after transmission data is transmitted on the transmission side. A test apparatus having a retransmission control unit for retransmitting the transmission data on the side is provided.
　本発明の第２の態様においては、受信側および送信側の間で伝送データを伝送するシリアル伝送システムであって、受信側において伝送データを受け取った場合に、当該伝送データを受け取った旨の確認信号を送信側に送信する受信通知部と、送信側において伝送データを送信してから、予め定められた期間内に当該伝送データの確認信号を受け取らない場合に、送信側から受信側に当該伝送データを再送させる再送制御部とを備えるシリアル伝送システムを提供する。 In the second aspect of the present invention, a serial transmission system for transmitting transmission data between a reception side and a transmission side, and when transmission data is received at the reception side, confirmation that the transmission data has been received A reception notifying unit for transmitting a signal to the transmission side, and transmission from the transmission side to the reception side when the transmission data is transmitted on the transmission side and a confirmation signal of the transmission data is not received within a predetermined period. A serial transmission system including a retransmission control unit that retransmits data is provided.
　本発明の第３の態様においては、被試験デバイスを試験する試験装置を機能させるプログラムであって、試験装置を、被試験デバイスと電気的に接続され、被試験デバイスを試験する試験ユニットと、試験ユニットを制御する制御部と、制御部および試験ユニットの間で伝送データを伝送するシリアル伝送部として機能させ、シリアル伝送部を、受信側において伝送データを受け取った場合に、当該伝送データを受け取った旨の確認信号を送信側に送信する受信通知部と、送信側において伝送データを送信してから、予め定められた期間内に当該伝送データの確認信号を受け取らない場合に、送信側から受信側に当該伝送データを再送させる再送制御部として機能させるプログラムおよび記録媒体を提供する。 In a third aspect of the present invention, a program for causing a test apparatus for testing a device under test to function, the test apparatus being electrically connected to the device under test and testing the device under test, Functions as a control unit that controls the test unit and a serial transmission unit that transmits transmission data between the control unit and the test unit. When the serial transmission unit receives transmission data on the receiving side, it receives the transmission data. A reception notification unit that transmits a confirmation signal indicating that the transmission data has been transmitted to the transmission side, and reception from the transmission side when the transmission data is not received within a predetermined period after transmission data is transmitted on the transmission side. A program and a recording medium are provided that function as a retransmission control unit that retransmits the transmission data.
　なお、上記の発明の概要は、本発明の必要な特徴の全てを列挙したものではなく、これらの特徴群のサブコンビネーションもまた、発明となりうる。 Note that the above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.
本実施形態に係る半導体試験装置１０の構成を示す。1 shows a configuration of a semiconductor test apparatus 10 according to the present embodiment. シリアル伝送部４０の構成を示す。The structure of the serial transmission part 40 is shown. 送受信部１００から送受信部２００にデータを送信する場合の正常時のシーケンスを示す。A normal sequence when data is transmitted from the transmission / reception unit 100 to the transmission / reception unit 200 is shown. 送受信部１００から送受信部２００へのデータ送信において、送信したＤＡＴフレームが消失した場合のシーケンスを示す。In the data transmission from the transmission / reception unit 100 to the transmission / reception unit 200, a sequence when the transmitted DAT frame is lost is shown. 送受信部１００から送受信部２００へのデータ送信において、送受信部２００が送信したＡＣＫフレームが消失した場合のシーケンスを示す。In the data transmission from the transmission / reception unit 100 to the transmission / reception unit 200, a sequence when the ACK frame transmitted by the transmission / reception unit 200 is lost is shown. 送受信部１００から送受信部２００へのデータ送信において、送受信部２００が送信したＡＣＫフレームにエラーが生じていた場合のシーケンスを示す。In the data transmission from the transmission / reception unit 100 to the transmission / reception unit 200, a sequence when an error has occurred in the ACK frame transmitted by the transmission / reception unit 200 is shown. シリアル伝送部４０の第２の構成を示す。The 2nd structure of the serial transmission part 40 is shown. 送受信部１００から送受信部２００へのデータ送信において、複数のフレームを送信する場合のシーケンスを示す。A sequence in the case of transmitting a plurality of frames in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200 is shown. 送受信部１００が送受信部２００に対して複数のＤＡＴフレームを送信する場合の、正常動作時のタイミングシーケンスを示す。A timing sequence during normal operation when the transmission / reception unit 100 transmits a plurality of DAT frames to the transmission / reception unit 200 is shown. 送受信部１００から送受信部２００へのデータ送信において、送受信部２００がＤＡＴフレームを正常に受信できない場合のタイミングシーケンスを示す。In the data transmission from the transmission / reception unit 100 to the transmission / reception unit 200, a timing sequence when the transmission / reception unit 200 cannot normally receive the DAT frame is shown. 送受信部１００から送受信部２００へのデータ送信において、送受信部２００が送信したＡＣＫフレームが伝送媒体４２において消失した場合のタイミングシーケンスを示す。In the data transmission from the transmission / reception unit 100 to the transmission / reception unit 200, a timing sequence when the ACK frame transmitted by the transmission / reception unit 200 is lost in the transmission medium 42 is shown. 送受信部１００から送受信部２００にデータを送信する場合のタイミングシーケンスを示す。A timing sequence in the case where data is transmitted from the transceiver unit 100 to the transceiver unit 200 is shown. 送受信部１００から送受信部２００へのデータ送信において再送が発生した場合に、送受信部１００がタイムアウトにより再送するタイミングシーケンスを示す。A timing sequence in which the transmission / reception unit 100 retransmits due to timeout when retransmission occurs in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200 is shown. 第２の実施形態に係るコンピュータ１９００のハードウェア構成の一例を示す。An example of the hardware constitutions of the computer 1900 which concerns on 2nd Embodiment is shown.
符号の説明Explanation of symbols
１０　半導体試験装置
２０　制御部
２２　試験制御プログラム
３０　試験ユニット
４０　シリアル伝送部
４２　伝送媒体
５０　被試験デバイス
１００　送受信部
１０２　データ管理部
１０４　データ送信部
１０６　マルチプレクサ
１０８　データ受信部
１１０　受信通知部
１１２　再送制御部
１１４　ＩＤ期待値比較部
１１６　ＩＤ期待値更新部
１１８　ＩＤ期待値記憶部
２００　送受信部
２０２　データ管理部
２０４　データ送信部
２０６　マルチプレクサ
２０８　データ受信部
２１０　受信通知部
２１２　再送制御部
２１４　ＩＤ期待値比較部
２１６　ＩＤ期待値更新部
２１８　ＩＤ期待値記憶部
１９００　コンピュータ
２０００　ＣＰＵ
２０１０　ＲＯＭ
２０２０　ＲＡＭ
２０３０　通信インターフェイス
２０４０　ハードディスクドライブ
２０５０　フレキシブルディスク・ドライブ
２０６０　ＣＤ－ＲＯＭドライブ
２０７０　入出力チップ
２０７５　グラフィック・コントローラ
２０８０　表示装置
２０８２　ホスト・コントローラ
２０８４　入出力コントローラ
２０９０　フレキシブルディスク
２０９５　ＣＤ－ＲＯＭ DESCRIPTION OF SYMBOLS 10 Semiconductor test apparatus 20 Control part 22 Test control program 30 Test unit 40 Serial transmission part 42 Transmission medium 50 Device under test 100 Transmission / reception part 102 Data management part 104 Data transmission part 106 Multiplexer 108 Data reception part 110 Reception notification part 112 Retransmission control part 114 ID expected value comparison unit 116 ID expected value update unit 118 ID expected value storage unit 200 transmission / reception unit 202 data management unit 204 data transmission unit 206 multiplexer 208 data reception unit 210 reception notification unit 212 retransmission control unit 214 ID expected value comparison unit 216 Expected ID value update unit 218 Expected ID value storage unit 1900 Computer 2000 CPU
2010 ROM
2020 RAM
2030 Communication interface 2040 Hard disk drive 2050 Flexible disk drive 2060 CD-ROM drive 2070 Input / output chip 2075 Graphic controller 2080 Display device 2082 Host controller 2084 Input / output controller 2090 Flexible disk 2095 CD-ROM
　以下、発明の実施の形態を通じて本発明の一側面を説明するが、以下の実施形態は請求の範囲にかかる発明を限定するものではなく、また実施形態の中で説明されている特徴の組み合わせの全てが発明の解決手段に必須であるとは限らない。 Hereinafter, one aspect of the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the scope of claims, and are combinations of features described in the embodiments. Not all are essential to the solution of the invention.
　図１は、本実施形態に係る半導体試験装置１０の構成を、被試験デバイス５０と共に示す。半導体試験装置１０は、制御部２０、複数の試験ユニット３０、および、複数のシリアル伝送部４０を備える。制御部２０は、予め与えられる複数の試験制御プログラム２２等を実行することにより、複数の試験ユニット３０を制御して、複数の被試験デバイス５０の試験を制御する。制御部２０は、例えばＣＰＵを有してよい。 FIG. 1 shows a configuration of a semiconductor test apparatus 10 according to the present embodiment together with a device under test 50. The semiconductor test apparatus 10 includes a control unit 20, a plurality of test units 30, and a plurality of serial transmission units 40. The control unit 20 controls a plurality of test units 30 by executing a plurality of test control programs 22 and the like given in advance, thereby controlling tests on a plurality of devices under test 50. The control unit 20 may include a CPU, for example.
　複数の試験ユニット３０は、複数の被試験デバイス５０または被試験デバイス５０の複数のピンに対応して設けられる。制御部２０は、これらの試験ユニット３０を制御して、複数の被試験デバイス５０を並行して試験してよい。それぞれの試験ユニット３０は、被試験デバイスと電気的に接続されて、被試験デバイスを試験する。例えば、それぞれの試験ユニット３０は、被試験デバイスの試験に用いるデータを生成すると共に、被試験デバイスが出力するデータを解析してもよい。 The plurality of test units 30 are provided corresponding to the plurality of devices under test 50 or the plurality of pins of the device under test 50. The control unit 20 may control these test units 30 to test a plurality of devices under test 50 in parallel. Each test unit 30 is electrically connected to the device under test and tests the device under test. For example, each test unit 30 may generate data used for testing the device under test and analyze data output from the device under test.
　シリアル伝送部４０は、伝送媒体４２、送受信部１００、および、送受信部２００を備える。送受信部１００は、伝送媒体４２の制御部２０側の端部に設けられてよい。また、送受信部２００は、伝送媒体４２の試験ユニット３０側の端部に設けられてよい。送受信部１００および送受信部２００は、伝送媒体４２を介して、制御部２０および試験ユニット３０の間で伝送データを伝送する。 The serial transmission unit 40 includes a transmission medium 42, a transmission / reception unit 100, and a transmission / reception unit 200. The transmission / reception unit 100 may be provided at the end of the transmission medium 42 on the control unit 20 side. The transmission / reception unit 200 may be provided at the end of the transmission medium 42 on the test unit 30 side. The transmission / reception unit 100 and the transmission / reception unit 200 transmit transmission data between the control unit 20 and the test unit 30 via the transmission medium 42.
　また、送受信部１００および送受信部２００は、制御部２０および試験ユニット３０の間で伝送データを正常に送受信できない場合に、制御部２０からの制御を介さずに、当該伝送データを復旧する。これにより、伝送エラーが生じた場合に、マルチタスクを実行している制御部２０の負荷を増大させずに、伝送データを復旧することができる。送受信部１００および送受信部２００は、ハードウェアにより、伝送エラーの検出および復旧を行ってよい。 Further, when the transmission / reception unit 100 and the transmission / reception unit 200 cannot normally transmit / receive transmission data between the control unit 20 and the test unit 30, the transmission / reception unit 100 and the transmission / reception unit 200 restore the transmission data without being controlled by the control unit 20. Thereby, when a transmission error occurs, the transmission data can be recovered without increasing the load on the control unit 20 executing the multitask. The transmission / reception unit 100 and the transmission / reception unit 200 may detect and recover a transmission error by hardware.
　図２は、シリアル伝送部４０の構成を示す。本例の送受信部１００および送受信部２００は、伝送データを受け取った場合に、その旨を相手方に通知する。伝送データを送信した送受信部は、当該伝送データを受け取った旨が、所定の期間内に相手方から通知されない場合に、当該伝送データを再送する。同図において、送受信部１００は、データ管理部１０２、データ送信部１０４、マルチプレクサ１０６、データ受信部１０８、受信通知部１１０、および、再送制御部１１２を有する。また、送受信部２００は、データ管理部２０２、データ送信部２０４、マルチプレクサ２０６、データ受信部２０８、受信通知部２１０、および、再送制御部２１２を有する。送受信部１００および送受信部２００は、同一の構成を有してよい。また、送受信部１００および送受信部２００において対応する構成要素は、同一の機能を有してよい。 FIG. 2 shows the configuration of the serial transmission unit 40. When the transmission / reception unit 100 and the transmission / reception unit 200 of this example receive the transmission data, the transmission / reception unit 100 and the transmission / reception unit 200 notify the other party to that effect. The transmission / reception unit that has transmitted the transmission data retransmits the transmission data when the other party is not notified that the transmission data has been received within a predetermined period. In the figure, the transmission / reception unit 100 includes a data management unit 102, a data transmission unit 104, a multiplexer 106, a data reception unit 108, a reception notification unit 110, and a retransmission control unit 112. The transmission / reception unit 200 includes a data management unit 202, a data transmission unit 204, a multiplexer 206, a data reception unit 208, a reception notification unit 210, and a retransmission control unit 212. The transceiver unit 100 and the transceiver unit 200 may have the same configuration. Moreover, the corresponding component in the transmission / reception unit 100 and the transmission / reception unit 200 may have the same function.
　データ管理部１０２は、送受信部１００が送受信部２００との間で行う、伝送フレームの送受信を制御する。本例では、伝送フレームとして、試験パターン等の伝送データを含むフレーム種別（以下、ＤＡＴフレームと称する）と、伝送データを受け取った旨の確認信号を含むフレーム種別（以下、ＡＣＫフレームと称する）とを用いて説明する。また、データ管理部１０２は、制御部２０から入力されたデータを送受信部２００に対して送信してよく、送受信部２００から受信したデータを制御部２０に対して出力してよい。データ管理部１０２は、制御部２０、データ送信部１０４、および、データ受信部１０８がアクセスできる、デュアルポートメモリを有してよい。 The data management unit 102 controls transmission / reception of transmission frames performed by the transmission / reception unit 100 with the transmission / reception unit 200. In this example, as a transmission frame, a frame type including transmission data such as a test pattern (hereinafter referred to as a DAT frame) and a frame type including a confirmation signal indicating that the transmission data has been received (hereinafter referred to as an ACK frame) Will be described. In addition, the data management unit 102 may transmit data input from the control unit 20 to the transmission / reception unit 200 and may output data received from the transmission / reception unit 200 to the control unit 20. The data management unit 102 may include a dual port memory that can be accessed by the control unit 20, the data transmission unit 104, and the data reception unit 108.
　データ送信部１０４は、データ管理部１０２が記憶している伝送データに識別データ（以下、フレームＩＤ）を付したＤＡＴフレームを組み立てる。また、データ送信部１０４は、マルチプレクサ１０６を介して、当該ＤＡＴフレームを送受信部２００に対して送信する。データ送信部１０４は、順次送信する伝送データに付するフレームＩＤを、伝送データ毎に予め定められた規則で変化させてよい。例えばデータ送信部１０４は、伝送データ毎に順次インクリメントした数字を含むフレームＩＤを、伝送データに付してよい。ＤＡＴフレームは、フレームＩＤ、フレーム種別情報、伝送データ、および、誤り検出用のＦＣＳ（フレームチェックシーケンス符号）を含んでよい。 The data transmission unit 104 assembles a DAT frame with identification data (hereinafter referred to as frame ID) added to the transmission data stored in the data management unit 102. In addition, the data transmission unit 104 transmits the DAT frame to the transmission / reception unit 200 via the multiplexer 106. The data transmission unit 104 may change the frame ID attached to the transmission data to be sequentially transmitted according to a predetermined rule for each transmission data. For example, the data transmission unit 104 may attach a frame ID including a number that is sequentially incremented for each transmission data to the transmission data. The DAT frame may include a frame ID, frame type information, transmission data, and FCS (frame check sequence code) for error detection.
　データ受信部１０８は、送受信部２００から受信した伝送フレームからフレーム種別情報を抽出した上で、フレーム種別を認識する。データ受信部１０８は、受信した伝送フレームがＡＣＫフレームである場合には、受信したＡＣＫフレームに含まれるデータを再送制御部１１２に対して出力してよい。また、データ受信部１０８は、受信した伝送データがＤＡＴフレームである場合には、受信通知部１１０に対して、受信したＤＡＴフレーム内のフレームＩＤを通知してよい。さらに、データ受信部１０８は、受信したＤＡＴフレームに含まれるデータをデータ管理部１０２に対して出力してよい。 The data reception unit 108 recognizes the frame type after extracting the frame type information from the transmission frame received from the transmission / reception unit 200. If the received transmission frame is an ACK frame, the data reception unit 108 may output data included in the received ACK frame to the retransmission control unit 112. Further, when the received transmission data is a DAT frame, the data reception unit 108 may notify the reception notification unit 110 of the frame ID in the received DAT frame. Further, the data reception unit 108 may output data included in the received DAT frame to the data management unit 102.
　受信通知部１１０は、データ受信部１０８が送受信部２００からＤＡＴフレームを受信した場合には、データ受信部１０８が受信したＤＡＴフレームに含まれる、少なくとも一部のデータをデータ受信部１０８から受け取り、当該伝送データを受け取った旨のＡＣＫフレームを送受信部２００に送信する。例えば、受信通知部１１０は、データ受信部１０８から受け取ったデータに含まれているフレームＩＤと同一のフレームＩＤを付したＡＣＫフレームを生成した上で、マルチプレクサ１０６に出力してよい。マルチプレクサ１０６は、データ送信部１０４が出力するＤＡＴフレーム、または、受信通知部１１０が出力するＡＣＫフレームを、送受信部２００に対して送信してよい。 When the data reception unit 108 receives a DAT frame from the transmission / reception unit 200, the reception notification unit 110 receives at least a part of data included in the DAT frame received by the data reception unit 108 from the data reception unit 108, An ACK frame indicating that the transmission data has been received is transmitted to the transmission / reception unit 200. For example, the reception notification unit 110 may generate an ACK frame with the same frame ID as the frame ID included in the data received from the data reception unit 108 and output the ACK frame to the multiplexer 106. The multiplexer 106 may transmit the DAT frame output from the data transmission unit 104 or the ACK frame output from the reception notification unit 110 to the transmission / reception unit 200.
　再送制御部１１２は、送受信部２００に対して送信するＤＡＴフレームの送信順序を制御する。また、再送制御部１１２は、データ受信部１０８が受信した伝送データがＡＣＫフレームである場合に、当該ＡＣＫフレームに含まれるデータを受け取る。再送制御部１１２は、データ送信部１０４がＤＡＴフレームを送信してから、予め定められた期間内に当該ＤＡＴフレームに対応するＡＣＫフレームを受け取らない場合に、データ送信部１０４から送受信部２００に対して、当該ＤＡＴフレームを再送させてよい。 The retransmission control unit 112 controls the transmission order of DAT frames transmitted to the transmission / reception unit 200. In addition, when the transmission data received by the data reception unit 108 is an ACK frame, the retransmission control unit 112 receives data included in the ACK frame. When the data transmission unit 104 does not receive an ACK frame corresponding to the DAT frame within a predetermined period after the data transmission unit 104 transmits the DAT frame, the retransmission control unit 112 transmits the data transmission unit 104 to the transmission / reception unit 200. The DAT frame may be retransmitted.
　例えば、再送制御部１１２は、再送すべきフレームＩＤをデータ送信部１０４に通知してよい。データ送信部１０４は、データ管理部１０２から再送すべきデータを読み出した上で、再送制御部１１２から通知されたフレームＩＤを当該データに付した上で、送受信部２００に対して送信してよい。 For example, the retransmission control unit 112 may notify the data transmission unit 104 of the frame ID to be retransmitted. The data transmission unit 104 may read the data to be retransmitted from the data management unit 102, attach the frame ID notified from the retransmission control unit 112 to the data, and transmit the data to the transmission / reception unit 200. .
　なお、再送制御部１１２は、次に送信すべきデータがデータ送信部１０４に与えられていない場合に、次に送信すべきデータがデータ送信部１０４に与えられるまで、直前に送信した伝送データを送受信部２００に対して再送させ続けてよい。例えば、データ管理部１０２が送受信部２００に送信すべき伝送データを有する場合には、再送制御部１１２は、予め定められた規則に従うフレームＩＤを生成して、データ送信部１０４に通知してよい。これに対して、データ管理部１０２が送受信部２００に送信すべきデータを有しない場合には、既に送信したＤＡＴフレームを送受信部２００に対して再送するべく、データ送信部１０４に通知してよい。 Note that, when the data to be transmitted next is not given to the data transmission unit 104, the retransmission control unit 112 transmits the transmission data transmitted immediately before until the data to be transmitted next is given to the data transmission unit 104. The transmission / reception unit 200 may continue to retransmit. For example, when the data management unit 102 has transmission data to be transmitted to the transmission / reception unit 200, the retransmission control unit 112 may generate a frame ID according to a predetermined rule and notify the data transmission unit 104 of the frame ID. . On the other hand, when the data management unit 102 does not have data to be transmitted to the transmission / reception unit 200, the data transmission unit 104 may be notified to retransmit the DAT frame that has already been transmitted to the transmission / reception unit 200. .
　送受信部２００は、送受信部２００が有するデータ管理部２０２、データ送信部２０４、マルチプレクサ２０６、データ受信部２０８、受信通知部２１０、および、再送制御部２１２により、送受信部１００と同様に、ＤＡＴフレームの送受信、および、ＡＣＫフレームの送受信を行ってよい。送受信部２００は、試験ユニット３０から入力されたデータを送受信部１００に送信してよく、送受信部１００から受け取ったデータを試験ユニット３０に対して出力してよい。 Similar to the transmission / reception unit 100, the transmission / reception unit 200 includes a data management unit 202, a data transmission unit 204, a multiplexer 206, a data reception unit 208, a reception notification unit 210, and a retransmission control unit 212. Transmission and reception and ACK frame transmission and reception may be performed. The transmission / reception unit 200 may transmit the data input from the test unit 30 to the transmission / reception unit 100, and may output the data received from the transmission / reception unit 100 to the test unit 30.
　図３は、送受信部１００から送受信部２００にデータを送信する場合の正常時のシーケンスを示す。以下、送受信部１００をＤＡＴフレームの送信側、送受信部２００をＡＣＫフレームの送信側として説明するが、送受信部２００がＤＡＴフレームの送信側、送受信部１００がＡＣＫフレームの送信側として動作してもよい。また、送受信部１００および送受信部２００は、ＤＡＴフレームを受信しながら、ＤＡＴフレームを送信してもよい。 FIG. 3 shows a normal sequence when data is transmitted from the transmission / reception unit 100 to the transmission / reception unit 200. The transmission / reception unit 100 will be described as a DAT frame transmission side and the transmission / reception unit 200 will be described as an ACK frame transmission side. However, even if the transmission / reception unit 200 operates as a DAT frame transmission side and the transmission / reception unit 100 operates as an ACK frame transmission side. Good. Further, the transmission / reception unit 100 and the transmission / reception unit 200 may transmit the DAT frame while receiving the DAT frame.
　データ送信部１０４がＤＡＴフレームを送信すると（Ｓ１０１）、データ受信部２０８は、当該ＤＡＴフレームを受信する（Ｓ２０１）。データ受信部２０８は、受信したＤＡＴフレームに含まれる伝送データ等を、データ管理部２０２に対して出力する（Ｓ２０２）。データ受信部２０８は、伝送データおよびフレームＩＤをデータ管理部２０２に出力してよい。 When the data transmission unit 104 transmits a DAT frame (S101), the data reception unit 208 receives the DAT frame (S201). The data reception unit 208 outputs transmission data and the like included in the received DAT frame to the data management unit 202 (S202). The data receiving unit 208 may output the transmission data and the frame ID to the data management unit 202.
　さらに、データ受信部２０８は、伝送データを受信したことを受信通知部２１０に通知する。データ受信部２０８は、ＤＡＴフレームに含まれるフレームＩＤを、受信通知部２１０に通知してよい。受信通知部２１０は、データ受信部２０８から受けた通知に基づいて、受信したＤＡＴフレームに対するＡＣＫフレームを、送受信部１００に対して送信する（Ｓ２０３）。例えば、受信通知部２１０は、データ受信部２０８から受け取ったフレームＩＤと同一のフレームＩＤを含むＡＣＫフレームを、送受信部１００に対して送信してよい。送受信部１００は、データ受信部１０８においてＡＣＫフレームを受信する（Ｓ１０２）。送受信部１００は、受信したＡＣＫフレームに含まれるフレームＩＤを確認することで、当該フレームＩＤに対応する伝送データが送受信部２００に届いたことを認識する。 Further, the data receiving unit 208 notifies the reception notifying unit 210 that the transmission data has been received. The data reception unit 208 may notify the reception notification unit 210 of the frame ID included in the DAT frame. The reception notification unit 210 transmits an ACK frame for the received DAT frame to the transmission / reception unit 100 based on the notification received from the data reception unit 208 (S203). For example, the reception notification unit 210 may transmit an ACK frame including the same frame ID as the frame ID received from the data reception unit 208 to the transmission / reception unit 100. In the transmission / reception unit 100, the data reception unit 108 receives the ACK frame (S102). The transmission / reception unit 100 recognizes that the transmission data corresponding to the frame ID has reached the transmission / reception unit 200 by confirming the frame ID included in the received ACK frame.
　図４は、送受信部１００から送受信部２００へのデータ送信において、送信したＤＡＴフレームが消失した場合のシーケンスを示す。送受信部１００がＤＡＴフレームを送信したにもかかわらず（Ｓ３０１）、送信したＤＡＴフレームが伝送媒体４２において消失した場合には（Ｓ４０１）、送受信部２００は、データ管理部２０２へのデータ出力（Ｓ４０２）、および、送受信部１００へのＡＣＫフレームの送信（Ｓ４０３）を行うことができない。 FIG. 4 shows a sequence when the transmitted DAT frame is lost in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200. When the transmission / reception unit 100 transmits a DAT frame (S301), but the transmitted DAT frame disappears in the transmission medium 42 (S401), the transmission / reception unit 200 outputs data to the data management unit 202 (S402). ) And transmission of the ACK frame to the transmission / reception unit 100 (S403) cannot be performed.
　そこで、送受信部１００は、送受信部２００にＤＡＴフレームを送信してから所定の期間内に、送受信部２００から当該ＤＡＴフレームに対応するＡＣＫフレームが送信されない場合、当該ＤＡＴフレームの送受信が正常に行われなかったと判断してよい。例えば送受信部１００は、送受信部２００にＤＡＴフレームを送信してからの経過時間を、それぞれのＤＡＴフレーム毎に計測してよい。いずれかのＤＡＴフレームについて、送受信部２００に送信してから所定の時間が経過した場合には（Ｓ３０２）、再送制御部１１２は、データ送信部１０４に対して、当該ＤＡＴフレームを再送させる（Ｓ３０３）。送受信部２００が再送されたＤＡＴフレームを受信すると（Ｓ４０４）、データ受信部２０８は、受信したデータをデータ管理部２０２に対して出力すると共に（Ｓ４０５）、送受信部１００に対して、再送フレームに対するＡＣＫフレームを送信する（Ｓ４０６）。送受信部１００は、再送フレームに対するＡＣＫフレームを受信し（Ｓ３０４）、再送したデータが送受信部２００に届いたことを認識して、送受信部２００に対する当該ＤＡＴフレームの送信が終了する。 Therefore, when the ACK frame corresponding to the DAT frame is not transmitted from the transmission / reception unit 200 within a predetermined period after the transmission of the DAT frame to the transmission / reception unit 200, the transmission / reception unit 100 performs normal transmission / reception of the DAT frame. You may judge that it was not. For example, the transmission / reception unit 100 may measure the elapsed time after transmitting the DAT frame to the transmission / reception unit 200 for each DAT frame. When a predetermined time has passed since any DAT frame is transmitted to the transmission / reception unit 200 (S302), the retransmission control unit 112 causes the data transmission unit 104 to retransmit the DAT frame (S303). ). When the transmission / reception unit 200 receives the retransmitted DAT frame (S404), the data reception unit 208 outputs the received data to the data management unit 202 (S405), and also sends the transmission / reception unit 100 to the retransmission frame. An ACK frame is transmitted (S406). The transmission / reception unit 100 receives the ACK frame for the retransmission frame (S304), recognizes that the retransmitted data has reached the transmission / reception unit 200, and ends transmission of the DAT frame to the transmission / reception unit 200.
　なお、図４においては、ＤＡＴフレームの消失を例として説明したが、送受信部２００が受信したＤＡＴフレームにエラーが生じた場合も、送受信部１００および送受信部２００は、同様の処理を行ってよい。この場合、データ受信部２０８は、エラーの検出を、ＤＡＴフレームに付加されたＦＣＳ（フレームチェックシーケンス）の演算によって行ってよい。 In FIG. 4, the DAT frame disappearance has been described as an example. However, even when an error occurs in the DAT frame received by the transmission / reception unit 200, the transmission / reception unit 100 and the transmission / reception unit 200 may perform the same processing. . In this case, the data reception unit 208 may detect an error by calculating an FCS (frame check sequence) added to the DAT frame.
　ＤＡＴフレームにエラーが生じた場合、データ受信部２０８は、当該ＤＡＴフレームを受信した旨を、受信通知部２１０に通知しない。このため、送受信部１００では、当該ＤＡＴフレームに対応するＡＣＫフレームを受信できず、当該ＤＡＴフレームが再送される。なお、送受信部２００が受信したＤＡＴフレームにエラーが生じた場合、データ管理部２０２は、当該ＤＡＴフレームを破棄してよい。なお、データ受信部２０８は、ＤＡＴフレームにエラーがあることを検出した場合に、エラーを検出したことを示す確認信号を含むフレームを送受信部１００に送信してもよい。 When an error occurs in the DAT frame, the data reception unit 208 does not notify the reception notification unit 210 that the DAT frame has been received. For this reason, the transmission / reception unit 100 cannot receive an ACK frame corresponding to the DAT frame, and retransmits the DAT frame. When an error occurs in the DAT frame received by the transmission / reception unit 200, the data management unit 202 may discard the DAT frame. Note that when the data receiving unit 208 detects that there is an error in the DAT frame, the data receiving unit 208 may transmit a frame including a confirmation signal indicating that the error has been detected to the transmission / reception unit 100.
　図５は、送受信部１００から送受信部２００へのデータ送信において、送受信部２００が送信したＡＣＫフレームが消失した場合のシーケンスを示す。まず、送受信部１００がＤＡＴフレームを送信する（Ｓ５０１）。ＤＡＴフレームを受信すると（Ｓ６０１）、データ受信部２０８は、受信したＤＡＴフレームに含まれるデータをデータ管理部２０２に出力する（Ｓ６０２）。また、受信通知部２１０は、送受信部１００に対してＡＣＫフレームを送信する（Ｓ６０３）。ところが、送受信部２００が送信したＡＣＫフレームが伝送媒体４２等において消失すると、送受信部１００は、当該ＡＣＫフレームを受信できない（Ｓ５０２）。 FIG. 5 shows a sequence when an ACK frame transmitted by the transmission / reception unit 200 is lost in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200. First, the transmission / reception unit 100 transmits a DAT frame (S501). When receiving the DAT frame (S601), the data reception unit 208 outputs the data included in the received DAT frame to the data management unit 202 (S602). The reception notifying unit 210 transmits an ACK frame to the transmission / reception unit 100 (S603). However, if the ACK frame transmitted by the transmission / reception unit 200 disappears in the transmission medium 42 or the like, the transmission / reception unit 100 cannot receive the ACK frame (S502).
　この場合にも、図４の場合と同様に、ＤＡＴフレームを送信してから所定の時間が経過した場合には（Ｓ５０３）、再送制御部１１２は、データ送信部１０４に対して、Ｓ５０１で送信したＤＡＴフレームを再送させる（Ｓ５０４）。それ以降は、図４と同様のシーケンスにより、送受信部１００は、再送したＤＡＴフレームに対するＡＣＫフレームを受信して、送受信部１００から送受信部２００に対するデータの送信が終了する（Ｓ５０５）。 Also in this case, as in the case of FIG. 4, when a predetermined time has elapsed since the transmission of the DAT frame (S503), the retransmission control unit 112 transmits the data to the data transmission unit 104 in S501. The retransmitted DAT frame is retransmitted (S504). Thereafter, the transmission / reception unit 100 receives an ACK frame for the retransmitted DAT frame by the same sequence as in FIG. 4, and the transmission of data from the transmission / reception unit 100 to the transmission / reception unit 200 ends (S505).
　なお、図５の例においては、送受信部２００は、同一のＤＡＴフレームを複数回受信する（Ｓ６０４）。データ管理部２０２は、既に格納した伝送データと同一のフレームＩＤが付された伝送データを破棄してよい（Ｓ６０５）。 In the example of FIG. 5, the transmission / reception unit 200 receives the same DAT frame a plurality of times (S604). The data management unit 202 may discard the transmission data with the same frame ID as the already stored transmission data (S605).
　図６は、送受信部１００から送受信部２００へのデータ送信において、送受信部２００が送信したＡＣＫフレームにエラーが生じていた場合のシーケンスを示す。送受信部２００は、送受信部１００が送信したＤＡＴフレームを受信すると（Ｓ８０１）、受信したＤＡＴフレームに含まれる伝送データをデータ管理部２０２に出力する（Ｓ８０２）。また、送受信部２００は、受信したＤＡＴフレームに対するＡＣＫフレームを送信する（Ｓ８０３）。送受信部１００は、データ受信部１０８において、ＡＣＫフレームを受信するが、受信したＡＣＫフレームにエラーが生じていることを検出する場合がある（Ｓ７０２）。データ受信部１０８は、エラーの検出を、ＡＣＫフレームに付加されたＦＣＳ（フレームチェックシーケンス）の演算によって行ってよい。 FIG. 6 shows a sequence in the case where an error has occurred in the ACK frame transmitted by the transmission / reception unit 200 in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200. When receiving the DAT frame transmitted by the transmission / reception unit 100 (S801), the transmission / reception unit 200 outputs transmission data included in the received DAT frame to the data management unit 202 (S802). Further, the transmission / reception unit 200 transmits an ACK frame for the received DAT frame (S803). The transmission / reception unit 100 receives the ACK frame at the data reception unit 108, but may detect that an error has occurred in the received ACK frame (S702). The data receiving unit 108 may detect an error by calculating an FCS (frame check sequence) added to the ACK frame.
　データ受信部１０８は、ＡＣＫフレームにエラーが生じている場合には、当該ＡＣＫフレームに含まれるフレームＩＤに誤りが生じている可能性があるので、当該ＡＣＫフレームがいずれのＤＡＴフレームに対応するのかを判別できない。このため、データ受信部１０８は、当該ＡＣＫフレームを無視する。この結果、データ受信部１０８において、当該ＡＣＫフレームに対応するＤＡＴフレームについて、所定期間内にＡＣＫフレームを受信しなかったと判断され、その旨が再送制御部１１２に通知される。 If there is an error in the ACK frame, the data reception unit 108 may have an error in the frame ID included in the ACK frame, so which DAT frame the ACK frame corresponds to Cannot be determined. For this reason, the data receiving unit 108 ignores the ACK frame. As a result, the data receiving unit 108 determines that the ACK frame for the ACK frame corresponding to the ACK frame has not been received within a predetermined period, and notifies the retransmission control unit 112 to that effect.
　再送制御部１１２は、データ受信部１０８からの通知に基づいて、データ送信部１０４に対して、所定期間内にＡＣＫフレームを受信しなかったＤＡＴフレームを再送するように指示をする（Ｓ７０３）。それ以降は、図４と同様のシーケンスにより、送受信部１００は、再送したＤＡＴフレームに対するＡＣＫフレームを受信して、送受信部１００から送受信部２００に対する当該ＤＡＴフレームの送信が終了する（Ｓ７０４）。 The retransmission control unit 112 instructs the data transmission unit 104 to retransmit a DAT frame that has not received an ACK frame within a predetermined period based on the notification from the data reception unit 108 (S703). Thereafter, the transmission / reception unit 100 receives the ACK frame for the retransmitted DAT frame by the same sequence as in FIG. 4, and the transmission of the DAT frame from the transmission / reception unit 100 to the transmission / reception unit 200 ends (S704).
　なお、図６の例においても、送受信部２００は、同一のＤＡＴフレームを複数回受信する（Ｓ８０４）。データ管理部２０２は、既に格納した伝送データと同一のフレームＩＤが付された伝送データを破棄してよい（Ｓ８０５）。 In addition, also in the example of FIG. 6, the transmission / reception unit 200 receives the same DAT frame a plurality of times (S804). The data management unit 202 may discard the transmission data with the same frame ID as the already stored transmission data (S805).
　図７は、シリアル伝送部４０の第２の構成を示す。送受信部１００は、図２に示す構成に加えて、ＩＤ期待値比較部１１４、ＩＤ期待値更新部１１６、および、ＩＤ期待値記憶部１１８を、さらに有する。また、送受信部２００は、ＩＤ期待値比較部２１４、ＩＤ期待値更新部２１６、および、ＩＤ期待値記憶部２１８を、さらに有する。送受信部１００および送受信部２００において対応する構成要素は、同一の機能を有してよい。 FIG. 7 shows a second configuration of the serial transmission unit 40. The transmission / reception unit 100 further includes an expected ID value comparison unit 114, an expected ID value update unit 116, and an expected ID value storage unit 118 in addition to the configuration shown in FIG. The transmission / reception unit 200 further includes an expected ID value comparison unit 214, an expected ID value update unit 216, and an expected ID value storage unit 218. The corresponding components in the transmission / reception unit 100 and the transmission / reception unit 200 may have the same function.
　ＩＤ期待値記憶部１１８は、データ受信部１０８が受け取った伝送データに付されるフレームＩＤの期待値を記憶する。ＩＤ期待値記憶部１１８は、フレーム種別ごとに、フレームＩＤの期待値を記憶してよい。例えば、ＩＤ期待値記憶部１１８は、ＤＡＴフレームに対しては、ＤＡＴフレームＩＤ期待値を記憶するデータＩＤ期待値記憶部として機能してよく、ＡＣＫフレームに対しては、ＡＣＫフレームＩＤ期待値を記憶する確認ＩＤ期待値記憶部として機能してよい。また、ＩＤ期待値記憶部１１８は、ＩＤ期待値更新部１１６の制御により、記憶する期待値を更新してよい。 The ID expected value storage unit 118 stores the expected value of the frame ID attached to the transmission data received by the data receiving unit 108. The expected ID value storage unit 118 may store the expected value of the frame ID for each frame type. For example, the expected ID value storage unit 118 may function as a data ID expected value storage unit that stores an expected DAT frame ID value for a DAT frame, and an expected ACK frame ID value for an ACK frame. It may function as a confirmation ID expected value storage unit to be stored. Further, the expected ID value storage unit 118 may update the expected value to be stored under the control of the expected ID value update unit 116.
　ＩＤ期待値比較部１１４は、データ受信部１０８が受け取った伝送データに付されているフレームＩＤを、ＩＤ期待値記憶部１１８が記憶している期待値と比較する。ＩＤ期待値比較部１１４は、フレーム種別ごとに、フレームＩＤと期待値とを比較してよい。例えば、ＩＤ期待値比較部１１４は、ＤＡＴフレームに対しては、フレームＩＤとＤＡＴフレームＩＤ期待値とを比較するデータＩＤ期待値比較部として機能してよく、ＡＣＫフレームに対しては、フレームＩＤとＡＣＫフレームＩＤとを比較する確認ＩＤ期待値比較部として機能してよい。 The ID expected value comparison unit 114 compares the frame ID attached to the transmission data received by the data receiving unit 108 with the expected value stored in the ID expected value storage unit 118. The expected ID value comparison unit 114 may compare the frame ID and the expected value for each frame type. For example, the expected ID value comparison unit 114 may function as a data ID expected value comparison unit that compares a frame ID with an expected DAT frame ID value for a DAT frame, and a frame ID for an ACK frame. And an ACK frame ID may function as a confirmation ID expected value comparison unit.
　ＩＤ期待値更新部１１６は、ＩＤ期待値比較部１１４から比較結果を受け取る。また、ＩＤ期待値更新部１１６は、データ受信部１０８が受け取った伝送データに付されているフレームＩＤが、ＩＤ期待値記憶部１１８が記憶している期待値と一致する場合に、ＩＤ期待値記憶部１１８が記憶する期待値を、予め定められた規則に基づいて更新する。ＩＤ期待値更新部１１６は、フレーム種別ごとに期待値を更新してよい。例えば、ＩＤ期待値更新部１１６は、ＤＡＴフレームに対しては、ＤＡＴフレームＩＤ期待値を更新するデータＩＤ期待値更新部として機能してよく、ＡＣＫフレームに対しては、ＡＣＫフレームＩＤ期待値を更新する確認ＩＤ期待値更新部として機能してよい。 The ID expected value update unit 116 receives the comparison result from the ID expected value comparison unit 114. Also, the ID expected value update unit 116, when the frame ID attached to the transmission data received by the data receiving unit 108 matches the expected value stored in the ID expected value storage unit 118, The expected value stored in the storage unit 118 is updated based on a predetermined rule. The expected ID value updating unit 116 may update the expected value for each frame type. For example, the expected ID value update unit 116 may function as a data ID expected value update unit that updates the expected DAT frame ID value for the DAT frame, and the expected ACK frame ID value for the ACK frame. It may function as a confirmation ID expected value update unit to be updated.
　例えば、ＩＤ期待値更新部１１６は、ＩＤの値を１ずつ増加させることで、それぞれのＩＤ期待値を更新してよい。より具体的には、データ受信部１０８が送受信部２００から受信した、最新のＤＡＴフレームのフレームＩＤが「２」の場合、次に受け取るべきＤＡＴフレームのフレームＩＤは「３」である。従って、ＩＤ期待値記憶部１１８は、受信するＤＡＴフレームＩＤ期待値として「３」を記憶している。 For example, the expected ID value updating unit 116 may update each expected ID value by incrementing the ID value by one. More specifically, when the frame ID of the latest DAT frame received by the data reception unit 108 from the transmission / reception unit 200 is “2”, the frame ID of the DAT frame to be received next is “3”. Therefore, the expected ID value storage unit 118 stores “3” as the expected DAT frame ID value to be received.
　この状態で、データ受信部１０８が受信したＤＡＴフレームのフレームＩＤが「３」である場合には、ＩＤ期待値比較部１１４は、比較結果が一致していることをＩＤ期待値更新部１１６に通知する。ＩＤ期待値更新部１１６は、比較結果が一致している場合には、ＩＤ期待値記憶部１１８に対して、記憶しているＤＡＴフレームＩＤ期待値を「４」に更新する指示を出してよい。ＩＤ期待値記憶部１１８は、ＩＤ期待値更新部１１６の指示に基づいて、記憶するＤＡＴフレームＩＤ期待値を「４」に更新する。 In this state, when the frame ID of the DAT frame received by the data reception unit 108 is “3”, the ID expected value comparison unit 114 informs the ID expected value update unit 116 that the comparison results match. Notice. If the comparison result matches, the ID expected value update unit 116 may instruct the ID expected value storage unit 118 to update the stored DAT frame ID expected value to “4”. . The expected ID value storage unit 118 updates the stored DAT frame ID expected value to “4” based on an instruction from the expected ID value update unit 116.
　これに対して、データ受信部１０８が受信したＤＡＴフレームのフレームＩＤが「３」でない場合には、ＩＤ期待値比較部１１４は、比較結果が一致しないことをＩＤ期待値更新部１１６に通知する。ＩＤ期待値更新部１１６は、比較結果が一致しない場合には、ＩＤ期待値記憶部１１８に対して、記憶しているＤＡＴフレームＩＤ期待値を更新する指示を出力しない。 On the other hand, when the frame ID of the DAT frame received by the data reception unit 108 is not “3”, the ID expected value comparison unit 114 notifies the ID expected value update unit 116 that the comparison results do not match. . If the comparison result does not match, the ID expected value update unit 116 does not output an instruction to update the stored DAT frame ID expected value to the ID expected value storage unit 118.
　ＩＤ期待値比較部１１４は、比較結果をデータ受信部１０８に通知してよい。データ受信部１０８は、ＩＤ期待値比較部１１４から受け取った比較結果に基づいて、後段の回路に対して、受信した伝送データに含まれるデータを出力するか否かを制御してよい。例えば、データ受信部１０８は、ＩＤ期待値比較部１１４から受けた比較結果に基づいて、送受信部２００から受け取ったＤＡＴフレームのフレームＩＤが、予め定められた規則により定まるフレームＩＤと異なる場合に、データ管理部１０２への伝送データの出力を停止してよい。また、データ受信部１０８は、予め定められた規則により定まるフレームＩＤが付された伝送データを受け取った場合に、データ管理部１０２への伝送データの出力を再開してよい。 The ID expected value comparison unit 114 may notify the data reception unit 108 of the comparison result. Based on the comparison result received from the ID expected value comparison unit 114, the data reception unit 108 may control whether or not to output data included in the received transmission data to a subsequent circuit. For example, the data reception unit 108, when the frame ID of the DAT frame received from the transmission / reception unit 200 is different from the frame ID determined by a predetermined rule based on the comparison result received from the ID expected value comparison unit 114, The output of transmission data to the data management unit 102 may be stopped. Further, the data receiving unit 108 may resume outputting the transmission data to the data management unit 102 when receiving transmission data with a frame ID determined by a predetermined rule.
　さらに、データ受信部１０８は、受信したＤＡＴフレームのフレームＩＤがＤＡＴフレームＩＤ期待値と異なるという通知を、ＩＤ期待値比較部１１４から受けた場合には、受信したデータをデータ管理部１０２に出力することなく、破棄してよい。また、データ受信部１０８は、受信したＤＡＴフレームのフレームＩＤがＤＡＴフレームＩＤ期待値と一致するという通知を、ＩＤ期待値比較部１１４から受けた場合には、受信データをデータ管理部１０２に対して出力してよい。 Further, when receiving a notification from the expected ID value comparison unit 114 that the frame ID of the received DAT frame is different from the expected DAT frame ID value, the data reception unit 108 outputs the received data to the data management unit 102. You can discard it without doing it. In addition, when receiving a notification from the expected ID value comparison unit 114 that the frame ID of the received DAT frame matches the expected DAT frame ID value, the data reception unit 108 sends the received data to the data management unit 102. May be output.
　なお、データ受信部１０８は、受信通知部１１０が送信したＡＣＫフレームのフレームＩＤと同一のフレームＩＤが付されたＤＡＴフレームを再度受け取った場合に、再度受け取ったＤＡＴフレームに含まれる伝送データを破棄してよい。また、受信通知部１１０は、再度受け取ったＤＡＴフレームに対するＡＣＫフレームを、送受信部２００に送信してよい。 The data receiving unit 108 discards the transmission data included in the received DAT frame again when the DAT frame having the same frame ID as the frame ID of the ACK frame transmitted by the reception notifying unit 110 is received again. You can do it. Further, the reception notifying unit 110 may transmit an ACK frame for the DAT frame received again to the transmission / reception unit 200.
　図８は、送受信部１００から送受信部２００へのデータ送信において、複数のＤＡＴフレームを送信する場合のシーケンスを示す。送受信部１００は、ＤＡＴフレーム０（フレームＩＤが「０」であるフレーム）を送信する（Ｓ９０１）。データ受信部２０８は、フレーム０を受信すると（Ｓ１００１）、受信したフレームに付されているフレームＩＤ「０」を取得する。 FIG. 8 shows a sequence in the case of transmitting a plurality of DAT frames in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200. The transmission / reception unit 100 transmits a DAT frame 0 (a frame whose frame ID is “0”) (S901). When receiving the frame 0 (S1001), the data receiving unit 208 acquires the frame ID “0” attached to the received frame.
　データ受信部２０８は、受信通知部２１０に対して、取得したフレームＩＤを通知する。さらに、データ受信部２０８は、受信通知部２１０に対して、通知したフレームＩＤを付したＡＣＫフレームを送受信部１００に送信するように指示する。受信通知部２１０は、データ受信部２０８の指示に基づいて、ＡＣＫフレーム０を送受信部１００に対して送信する（Ｓ１００３）。 The data reception unit 208 notifies the reception notification unit 210 of the acquired frame ID. Furthermore, the data reception unit 208 instructs the reception notification unit 210 to transmit an ACK frame with the notified frame ID to the transmission / reception unit 100. The reception notification unit 210 transmits ACK frame 0 to the transmission / reception unit 100 based on an instruction from the data reception unit 208 (S1003).
　また、データ受信部２０８は、取得したフレームＩＤをＩＤ期待値比較部２１４に対して出力する。ＩＤ期待値比較部２１４は、ＩＤ期待値記憶部２１８に記憶されているＤＡＴフレームＩＤ期待値を読み出した上で、データ受信部２０８から受け取ったフレームＩＤと比較する。初期状態では、ＩＤ期待値記憶部２１８にはＤＡＴフレームＩＤ期待値として「０」が記憶されている。 In addition, the data reception unit 208 outputs the acquired frame ID to the ID expected value comparison unit 214. The expected ID value comparison unit 214 reads the expected DAT frame ID value stored in the expected ID value storage unit 218 and compares it with the frame ID received from the data reception unit 208. In the initial state, “0” is stored in the expected ID value storage unit 218 as the expected DAT frame ID value.
　データ受信部２０８が受信したＤＡＴフレームのフレームＩＤは「０」なので、ＩＤ期待値比較部２１４は、データ受信部２０８から受け取ったフレームＩＤが、ＩＤ期待値記憶部２１８に記憶されているＤＡＴフレームＩＤ期待値と一致すると判断する。ＩＤ期待値比較部２１４は、フレームＩＤを比較した結果をデータ受信部２０８およびＩＤ期待値更新部２１６に通知する。 Since the frame ID of the DAT frame received by the data reception unit 208 is “0”, the ID expected value comparison unit 214 uses the DAT frame in which the frame ID received from the data reception unit 208 is stored in the ID expected value storage unit 218. It is determined that the ID matches the expected value. The expected ID value comparison unit 214 notifies the data reception unit 208 and the expected ID value update unit 216 of the result of comparing the frame IDs.
　ＩＤ期待値更新部２１６は、比較結果が一致しているので、正常な伝送データを受信したと判断して、ＩＤ期待値記憶部２１８が記憶するＤＡＴフレームＩＤ期待値を「１」に更新する。また、データ受信部２０８は、比較結果が一致しているので、正常な伝送データを受信したと判断して、受信した伝送データをデータ管理部２０２に出力する（Ｓ１００２）。 The expected ID value updating unit 216 determines that normal transmission data has been received because the comparison results match, and updates the expected DAT frame ID value stored in the expected ID value storage unit 218 to “1”. . In addition, since the comparison results match, the data reception unit 208 determines that normal transmission data has been received, and outputs the received transmission data to the data management unit 202 (S1002).
　送受信部１００は、ＤＡＴフレーム０に続いて、ＤＡＴフレーム１およびＤＡＴフレーム２を送信する（Ｓ９０２、Ｓ９０３）。ところが、本例においては、ＤＡＴフレーム１は、伝送媒体４２において消失している（Ｓ１００４）。従って、データ受信部２０８は、ＤＡＴフレーム１を受信することなく、ＤＡＴフレーム２を受信する（Ｓ１００５）。 The transmission / reception unit 100 transmits DAT frame 1 and DAT frame 2 following DAT frame 0 (S902, S903). However, in this example, the DAT frame 1 is lost in the transmission medium 42 (S1004). Therefore, the data receiving unit 208 receives the DAT frame 2 without receiving the DAT frame 1 (S1005).
　データ受信部２０８は、ＤＡＴフレーム２を受信すると、受信したフレームに付されているフレームＩＤ「２」を取得して、受信通知部２１０およびＩＤ期待値比較部２１４に出力する。受信通知部２１０は、ＡＣＫフレーム２を送受信部１００に対して送信する（Ｓ１００７）。また、ＩＤ期待値比較部２１４は、ＩＤ期待値記憶部２１８に記憶されているＤＡＴフレームＩＤ期待値「１」と、データ受信部２０８から受信したフレームＩＤ「２」とを比較する。ＩＤ期待値比較部２１４は、比較結果が一致しないことを、データ受信部２０８およびＩＤ期待値更新部２１６に通知する。 When receiving the DAT frame 2, the data receiving unit 208 acquires the frame ID “2” attached to the received frame, and outputs the frame ID “2” to the reception notifying unit 210 and the expected ID value comparing unit 214. The reception notification unit 210 transmits the ACK frame 2 to the transmission / reception unit 100 (S1007). Also, the expected ID value comparison unit 214 compares the expected DAT frame ID value “1” stored in the expected ID value storage unit 218 with the frame ID “2” received from the data reception unit 208. The expected ID value comparison unit 214 notifies the data reception unit 208 and the expected ID value update unit 216 that the comparison results do not match.
　データ受信部２０８は、比較結果が一致しないので、正常な伝送データを受信していないと判断して、データ管理部２０２に対しての受信した伝送データの出力を停止する（Ｓ１００６）。また、ＩＤ期待値更新部２１６は、比較結果が一致しないので、ＩＤ期待値記憶部２１８が記憶する期待値を更新しない。 Since the comparison result does not match, the data receiving unit 208 determines that normal transmission data has not been received, and stops outputting the received transmission data to the data management unit 202 (S1006). Further, the expected ID value updating unit 216 does not update the expected value stored in the expected ID value storage unit 218 because the comparison results do not match.
　再送制御部１１２は、ＤＡＴフレーム２の送信後、次に送信すべき伝送データをデータ管理部１０２が有しない場合には、データ送信部１０４に対して、ＤＡＴフレーム２の再送を繰り返すことを指示してよい（Ｓ９０４、Ｓ９０６、Ｓ９０７）。その間に、データ受信部１０８は、送受信部２００が送信したＡＣＫフレーム０を受信する（Ｓ９０８）。 The retransmission control unit 112 instructs the data transmission unit 104 to repeat retransmission of the DAT frame 2 when the data management unit 102 does not have the transmission data to be transmitted next after the transmission of the DAT frame 2. (S904, S906, S907). In the meantime, the data receiving unit 108 receives the ACK frame 0 transmitted by the transmitting / receiving unit 200 (S908).
　データ受信部１０８は、受信したＡＣＫフレーム０からフレームＩＤ「０」を取得する。データ受信部１０８は、取得したフレームＩＤをＩＤ期待値比較部１１４に対して出力する。ＩＤ期待値比較部１１４は、ＩＤ期待値記憶部１１８に記憶されているＡＣＫフレームに対するフレームＩＤの期待値を読み出した上で、データ受信部１０８から受け取ったフレームＩＤと比較する。 The data receiving unit 108 acquires the frame ID “0” from the received ACK frame 0. The data reception unit 108 outputs the acquired frame ID to the ID expected value comparison unit 114. The expected ID value comparison unit 114 reads the expected value of the frame ID for the ACK frame stored in the expected ID value storage unit 118 and compares it with the frame ID received from the data reception unit 108.
　初期状態では、ＩＤ期待値記憶部１１８にはＡＣＫフレームＩＤ期待値として「０」が記憶されている。従って、ＩＤ期待値比較部１１４は、データ受信部１０８から受け取ったフレームＩＤが、ＩＤ期待値記憶部１１８に記憶されているＡＣＫＩＤフレーム期待値に一致すると判断する。ＩＤ期待値比較部１１４は、フレームＩＤを比較した結果をデータ受信部１０８およびＩＤ期待値更新部１１６に通知する。 In the initial state, “0” is stored in the expected ID value storage unit 118 as the expected ACK frame ID value. Therefore, the expected ID value comparison unit 114 determines that the frame ID received from the data reception unit 108 matches the expected ACKID frame value stored in the expected ID value storage unit 118. The expected ID value comparison unit 114 notifies the data reception unit 108 and the expected ID value update unit 116 of the result of comparing the frame IDs.
　ＩＤ期待値更新部１１６は、比較結果が一致しているので、期待していたＡＣＫフレームを受信したと判断して、ＩＤ期待値記憶部１１８が記憶するＡＣＫフレームＩＤ期待値を「１」に更新する。また、データ受信部１０８は、比較結果が一致していることを再送制御部１１２に通知する。再送制御部１１２は、送信したＤＡＴフレーム０が送受信部２００に届いたと認識し、ＤＡＴフレーム０を再送しない。 The expected ID value update unit 116 determines that the expected ACK frame has been received because the comparison results match, and sets the expected ACK frame ID value stored in the expected ID value storage unit 118 to “1”. Update. In addition, the data reception unit 108 notifies the retransmission control unit 112 that the comparison results match. The retransmission control unit 112 recognizes that the transmitted DAT frame 0 has reached the transmission / reception unit 200 and does not retransmit the DAT frame 0.
　続いて、データ受信部２０８は、ＡＣＫフレーム２を受信する。データ受信部１０８は、受信したＡＣＫフレーム２からフレームＩＤ「２」を取得する。データ受信部１０８は、取得したフレームＩＤをＩＤ期待値比較部１１４に対して出力する。ＩＤ期待値比較部１１４は、ＩＤ期待値記憶部１１８が記憶しているＡＣＫフレームＩＤ期待値を読み出した上で、データ受信部１０８から受け取ったフレームＩＤと比較する。 Subsequently, the data receiving unit 208 receives the ACK frame 2. The data receiving unit 108 acquires the frame ID “2” from the received ACK frame 2. The data reception unit 108 outputs the acquired frame ID to the ID expected value comparison unit 114. The expected ID value comparison unit 114 reads the expected ACK frame ID value stored in the expected ID value storage unit 118 and compares it with the frame ID received from the data reception unit 108.
　ＩＤ期待値記憶部１１８は、ＤＡＴフレームＩＤ期待値として「１」を記憶している。従って、ＩＤ期待値比較部１１４は、データ受信部１０８から受け取ったフレームＩＤ「２」が、ＩＤ期待値記憶部１１８に記憶されているＡＣＫフレームＩＤ期待値「１」に一致しないと判断する。ＩＤ期待値比較部１１４は、フレームＩＤを比較した結果をデータ受信部１０８およびＩＤ期待値更新部１１６に通知する。ＩＤ期待値更新部１１６は、比較結果が一致しないので、ＩＤ期待値記憶部１１８が記憶するＡＣＫフレームＩＤ期待値を更新しない。 The expected ID storage unit 118 stores “1” as the expected DAT frame ID. Therefore, the expected ID value comparison unit 114 determines that the frame ID “2” received from the data reception unit 108 does not match the expected ACK frame ID value “1” stored in the expected ID value storage unit 118. The expected ID value comparison unit 114 notifies the data reception unit 108 and the expected ID value update unit 116 of the result of comparing the frame IDs. The expected ID value update unit 116 does not update the expected ACK frame ID value stored in the expected ID value storage unit 118 because the comparison result does not match.
　また、データ受信部１０８は、受信したＡＣＫフレーム２のフレームＩＤが、ＡＣＫフレームＩＤ期待値と一致していないことを、再送制御部１１２に通知する。再送制御部１１２は、データ受信部１０８からの通知に基づいて、ＤＡＴフレーム１を再送する必要があると認識する。そこで、再送制御部１１２は、データ送信部１０４に対して、ＤＡＴフレーム１を再送するよう指示する。 In addition, the data receiving unit 108 notifies the retransmission control unit 112 that the frame ID of the received ACK frame 2 does not match the expected ACK frame ID value. The retransmission control unit 112 recognizes that it is necessary to retransmit the DAT frame 1 based on the notification from the data receiving unit 108. Therefore, the retransmission control unit 112 instructs the data transmission unit 104 to retransmit the DAT frame 1.
　データ送信部１０４は、再送制御部１１２の指示に基づいて、データ管理部１０２からＤＡＴフレーム１で送信した伝送データを取得する。さらに、データ送信部１０４は、データ管理部１０２から取得した伝送データにフレームＩＤ「１」を付したＤＡＴフレーム１を組み立てて、送受信部２００に対してＤＡＴフレーム１を再送する（Ｓ９０９）。再送制御部１１２は、さらに、ＤＡＴフレーム２およびＤＡＴフレーム３をデータ送信部１０４に送信させてもよい（Ｓ９１０、Ｓ９１１）。 The data transmission unit 104 acquires transmission data transmitted by the DAT frame 1 from the data management unit 102 based on an instruction from the retransmission control unit 112. Further, the data transmission unit 104 assembles the DAT frame 1 with the frame ID “1” added to the transmission data acquired from the data management unit 102, and retransmits the DAT frame 1 to the transmission / reception unit 200 (S909). The retransmission control unit 112 may further cause the data transmission unit 104 to transmit the DAT frame 2 and the DAT frame 3 (S910, S911).
　データ受信部２０８は、データ送信部１０４が再送したＤＡＴフレーム１を受信する（Ｓ１０１４）。データ受信部２０８は、ＤＡＴフレーム１を受信すると、受信したフレームに付されているフレームＩＤ「１」を取得する。 The data receiving unit 208 receives the DAT frame 1 retransmitted by the data transmitting unit 104 (S1014). When receiving the DAT frame 1, the data receiving unit 208 acquires the frame ID “1” attached to the received frame.
　データ受信部２０８は、受信通知部２１０に対して、取得したフレームＩＤを通知すると共に、取得したフレームＩＤを付したＡＣＫフレームを送受信部１００に送信するように指示する。受信通知部２１０は、データ受信部２０８の指示に基づいて、ＡＣＫフレーム１を送受信部１００に対して送信する（Ｓ１０１６）。 The data reception unit 208 notifies the reception notification unit 210 of the acquired frame ID and instructs the transmission / reception unit 100 to transmit an ACK frame with the acquired frame ID. The reception notification unit 210 transmits ACK frame 1 to the transmission / reception unit 100 based on the instruction of the data reception unit 208 (S1016).
　また、データ受信部２０８は、取得したフレームＩＤをＩＤ期待値比較部２１４に対して出力する。ＩＤ期待値比較部２１４は、ＩＤ期待値記憶部２１８に記憶されているＤＡＴフレームＩＤ期待値を読み出した上で、データ受信部２０８から受け取ったフレームＩＤと比較する。ＩＤ期待値記憶部２１８にはＤＡＴフレームＩＤ期待値として「１」が記憶されている。 In addition, the data reception unit 208 outputs the acquired frame ID to the ID expected value comparison unit 214. The expected ID value comparison unit 214 reads the expected DAT frame ID value stored in the expected ID value storage unit 218 and compares it with the frame ID received from the data reception unit 208. The expected ID value storage unit 218 stores “1” as the expected DAT frame ID value.
　従って、ＩＤ期待値比較部２１４は、データ受信部２０８から受け取ったフレームＩＤ「１」が、ＩＤ期待値記憶部２１８に記憶されているＤＡＴフレームＩＤ期待値「１」に一致すると判断する。ＩＤ期待値比較部２１４は、フレームＩＤを比較した結果をデータ受信部２０８およびＩＤ期待値更新部２１６に通知する。 Therefore, the expected ID value comparison unit 214 determines that the frame ID “1” received from the data reception unit 208 matches the expected DAT frame ID value “1” stored in the expected ID value storage unit 218. The expected ID value comparison unit 214 notifies the data reception unit 208 and the expected ID value update unit 216 of the result of comparing the frame IDs.
　ＩＤ期待値更新部２１６は、比較結果が一致しているので、正常な伝送データを受信したと判断して、ＩＤ期待値記憶部２１８が記憶する期待値を「２」に更新する。また、データ受信部２０８は、比較結果が一致しているので、正常な伝送データを受信したと判断して、受信した伝送データをデータ管理部２０２に出力する。以下、データ受信部２０８は、受信したＤＡＴフレーム２およびＤＡＴフレーム３についても同様の処理を行い、受信した伝送データをデータ管理部２０２に出力してよい。 The ID expected value update unit 216 determines that the normal transmission data has been received because the comparison results match, and updates the expected value stored in the ID expected value storage unit 218 to “2”. Further, since the comparison results match, the data reception unit 208 determines that normal transmission data has been received, and outputs the received transmission data to the data management unit 202. Thereafter, the data reception unit 208 may perform the same processing on the received DAT frame 2 and DAT frame 3 and output the received transmission data to the data management unit 202.
　図９は、送受信部１００が送受信部２００に対して複数のＤＡＴフレームを送信する場合の、正常動作時のタイミングシーケンスを示す。同図において、「フレーム周期」は、最大長のフレームを送信する時間を示す。送受信部１００および送受信部２００は、送信するフレームのフレーム長にかかわらず、フレーム周期の間隔で、ＤＡＴフレームおよびＡＣＫフレームを送受信してよい。 FIG. 9 shows a timing sequence during normal operation when the transmission / reception unit 100 transmits a plurality of DAT frames to the transmission / reception unit 200. In the figure, the “frame period” indicates the time for transmitting the maximum length frame. The transmission / reception unit 100 and the transmission / reception unit 200 may transmit / receive the DAT frame and the ACK frame at intervals of the frame period regardless of the frame length of the frame to be transmitted.
　「送信側データ書き込み」信号は、制御部２０がデータ管理部１０２にデータを書き込む信号である。制御部２０は、データ管理部１０２にデータを書き込む「空き」がある場合に「送信側データ書き込み」信号をＨレベルに変化させ、データをデータ管理部１０２に書き込んでよい。 The “transmission side data write” signal is a signal for the control unit 20 to write data to the data management unit 102. The control unit 20 may change the “transmission side data write” signal to the H level and write the data to the data management unit 102 when there is “empty” in which the data management unit 102 writes the data.
　再送制御部１１２は、ＡＣＫフレームに基づいて、ＤＡＴフレームを送信する順序を制御する。再送制御部１１２は、ＡＣＫフレームＩＤ期待値と、受信したＡＣＫフレームのフレームＩＤとが一致している場合には、データ送信部１０４に対して、新たな伝送データを含むＤＡＴフレームを送信する指示を出してよい。データ送信部１０４は、再送制御部１１２から送信指示を受けると、データ管理部１０２から伝送データを読み出した上で、ＤＡＴフレームを生成して送受信部２００に対して送信してよい。これに対して、再送制御部１１２は、ＡＣＫフレームＩＤ期待値と、受信したＡＣＫフレームのフレームＩＤとが一致しない場合には直前に送信したＤＡＴフレームを再送するべくデータ送信部１０４に指示してよい。 The retransmission control unit 112 controls the order in which DAT frames are transmitted based on the ACK frame. The retransmission control unit 112 instructs the data transmission unit 104 to transmit a DAT frame including new transmission data when the expected value of the ACK frame ID matches the frame ID of the received ACK frame. May be issued. Upon receiving a transmission instruction from the retransmission control unit 112, the data transmission unit 104 may read the transmission data from the data management unit 102 and generate a DAT frame and transmit it to the transmission / reception unit 200. On the other hand, when the expected ACK frame ID value does not match the frame ID of the received ACK frame, the retransmission control unit 112 instructs the data transmission unit 104 to retransmit the DAT frame transmitted immediately before. Good.
　例えば、図９においては、データ管理部１０２にデータが存在しない為に、データ送信部１０４が４フレーム周期に渡ってＤＡＴフレーム０を送信する。Ｔ１０１において、送信側データ書き込み信号がＨレベルとなりデータがデータ管理部１０２に書き込みされると、データ送信部１０４は、フレームＩＤ「１」のＤＡＴフレームを送信する。以下、同様に、データ送信部１０４は、データ管理部１０２にデータが書き込まれるたびに、送信側ＤＡＴフレームＩＤを更新させ、ＤＡＴフレームを送信してよい。 For example, in FIG. 9, since there is no data in the data management unit 102, the data transmission unit 104 transmits the DAT frame 0 over a 4-frame period. In T101, when the transmission side data write signal becomes H level and data is written to the data management unit 102, the data transmission unit 104 transmits a DAT frame with the frame ID “1”. Similarly, the data transmission unit 104 may update the transmission side DAT frame ID and transmit a DAT frame each time data is written in the data management unit 102.
　「ＡＣＫフレームＩＤ期待値」は、ＩＤ期待値記憶部１１８が記憶している、ＡＣＫフレームに対するフレームＩＤ期待値を示す。「ＡＣＫフレームＩＤ着信値」は、データ受信部１０８が送受信部２００から受信したＡＣＫフレームに付されているフレームＩＤを示す。ＡＣＫフレームＩＤ返信値は、送受信部２００が送受信部１００に対して送信するＡＣＫフレームに付されているフレームＩＤを示す。 “Expected ACK frame ID value” indicates the expected frame ID value for the ACK frame stored in the expected ID value storage unit 118. The “ACK frame ID incoming value” indicates the frame ID attached to the ACK frame received from the transmission / reception unit 200 by the data reception unit 108. The ACK frame ID return value indicates the frame ID attached to the ACK frame transmitted from the transmission / reception unit 200 to the transmission / reception unit 100.
　「受信ＤＡＴフレーム」は、送受信部２００が受信したＤＡＴフレームを示す。「受信ＤＡＴフレーム」が「送信ＤＡＴフレーム」に対して約３フレーム周期分遅延している理由は、送受信部１００および送受信部２００の間の伝送媒体４２において生じる伝送遅延である。「ＤＡＴフレームＩＤ期待値」は、ＩＤ期待値記憶部２１８に記憶されている、ＤＡＴフレームＩＤ期待値である。「受信側データ出力」は、ＤＡＴフレームを受信したデータ受信部２０８が、データ管理部２０２に出力するデータを示す。 “Received DAT frame” indicates a DAT frame received by the transmission / reception unit 200. The reason why the “reception DAT frame” is delayed by about three frame periods from the “transmission DAT frame” is a transmission delay that occurs in the transmission medium 42 between the transmission / reception unit 100 and the transmission / reception unit 200. The “DAT frame ID expected value” is an expected DAT frame ID value stored in the expected ID value storage unit 218. “Receiver side data output” indicates data output to the data management unit 202 by the data receiving unit 208 that has received the DAT frame.
　データ送信部１０４がＴ１０１において送信したＤＡＴフレーム１は、Ｔ１０２において、データ受信部２０８が受信する。データ受信部２０８は、受信したＤＡＴフレーム１からフレームＩＤ「１」を取得して、取得したフレームＩＤをＩＤ期待値比較部２１４に通知する。ＩＤ期待値比較部２１４は、ＩＤ期待値記憶部２１８に記憶されているＤＡＴフレームＩＤ期待値と比較する。ＩＤ期待値比較部２１４は、比較結果をデータ受信部２０８およびＩＤ期待値更新部２１６に通知する。 The DAT frame 1 transmitted by the data transmission unit 104 at T101 is received by the data reception unit 208 at T102. The data reception unit 208 acquires the frame ID “1” from the received DAT frame 1 and notifies the ID expected value comparison unit 214 of the acquired frame ID. The expected ID value comparison unit 214 compares the expected DAT frame ID value stored in the expected ID value storage unit 218. The expected ID value comparison unit 214 notifies the data reception unit 208 and the expected ID value update unit 216 of the comparison result.
　ＩＤ期待値更新部２１６は、比較結果の通知を受けて、ＩＤ期待値記憶部２１８が記憶するＤＡＴフレームＩＤ期待値を「２」に更新する。データ受信部２０８は、比較結果の通知を受けて、受信したＤＡＴフレーム１に含まれている伝送データをデータ管理部２０２に出力する。また、データ受信部２０８は、受信通知部２１０に対して、ＡＣＫフレーム１を送信するべく指示する。受信通知部２１０は、データ受信部２０８の指示に基づいて、ＡＣＫフレーム１を送信する。さらに、データ受信部２０８は、受信したＤＡＴフレーム１に含まれているデータを、データ管理部２０２に対して出力してよい（Ｔ１０３）。 The ID expected value update unit 216 receives the notification of the comparison result and updates the DAT frame ID expected value stored in the ID expected value storage unit 218 to “2”. In response to the notification of the comparison result, the data reception unit 208 outputs the transmission data included in the received DAT frame 1 to the data management unit 202. Further, the data receiving unit 208 instructs the reception notifying unit 210 to transmit ACK frame 1. The reception notification unit 210 transmits the ACK frame 1 based on the instruction from the data reception unit 208. Further, the data reception unit 208 may output the data included in the received DAT frame 1 to the data management unit 202 (T103).
　データ受信部１０８は、受信通知部２１０が送信したＡＣＫフレーム１を受信する。データ受信部１０８は、受信したＡＣＫフレーム１からフレームＩＤ「１」を取得した上で、取得したフレームＩＤをＩＤ期待値比較部１１４に通知する。ＩＤ期待値比較部１１４は、ＩＤ期待値記憶部１１８に記憶されているＡＣＫフレームＩＤ受信期待値と比較する。 The data receiving unit 108 receives the ACK frame 1 transmitted by the reception notifying unit 210. The data reception unit 108 acquires the frame ID “1” from the received ACK frame 1 and notifies the ID expected value comparison unit 114 of the acquired frame ID. The expected ID value comparison unit 114 compares the expected ACK frame ID value stored in the expected ID value storage unit 118.
　ＩＤ期待値比較部１１４は、比較結果をデータ受信部１０８およびＩＤ期待値更新部１１６に通知する。ＩＤ期待値更新部１１６は、比較結果の通知を受けて、ＩＤ期待値記憶部１１８が記憶するＡＣＫフレームＩＤ期待値を「２」に更新する（Ｔ１０４）。以下、送受信部１００は、同様の手順を繰り返すことによって、複数のＤＡＴフレームを連続して送信することができる。 The ID expected value comparison unit 114 notifies the data reception unit 108 and the ID expected value update unit 116 of the comparison result. In response to the notification of the comparison result, the expected ID value update unit 116 updates the expected ACK frame ID value stored in the expected ID value storage unit 118 to “2” (T104). Thereafter, the transmission / reception unit 100 can continuously transmit a plurality of DAT frames by repeating the same procedure.
　図１０は、送受信部１００から送受信部２００へのデータ送信において、送受信部２００がＤＡＴフレームを正常に受信できない場合のタイミングシーケンスを示す。同図では、送受信部１００が送信したＤＡＴフレーム４が、伝送媒体４２において消失した場合を想定している（Ｔ１１１）。Ｔ１１１において、データ受信部２０８は、ＤＡＴフレーム４を受信すべきところであるが、ＤＡＴフレーム４が消失したことにより、次のフレーム周期において、ＤＡＴフレーム５を受信している。 FIG. 10 shows a timing sequence when the transmission / reception unit 200 cannot normally receive the DAT frame in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200. In the figure, it is assumed that the DAT frame 4 transmitted by the transmission / reception unit 100 is lost in the transmission medium 42 (T111). At T111, the data receiving unit 208 should receive the DAT frame 4, but has received the DAT frame 5 in the next frame period due to the disappearance of the DAT frame 4.
　データ受信部２０８は、ＤＡＴフレーム５を受信すると、受信したＤＡＴフレーム５からフレームＩＤ「５」を取得する。データ受信部２０８は、取得したフレームＩＤをＩＤ期待値比較部２１４に出力する。ＩＤ期待値比較部２１４は、ＩＤ期待値記憶部２１８が記憶しているＤＡＴフレームＩＤ期待値「４」と比較して、比較結果をＩＤ期待値更新部２１６に通知する。ＩＤ期待値更新部２１６は、比較結果が一致しないので、ＩＤ期待値記憶部２１８が記憶する期待値を更新しない。 When receiving the DAT frame 5, the data receiving unit 208 acquires the frame ID “5” from the received DAT frame 5. The data reception unit 208 outputs the acquired frame ID to the ID expected value comparison unit 214. The expected ID value comparison unit 214 compares the expected DAT frame ID value “4” stored in the expected ID value storage unit 218 and notifies the expected ID value update unit 216 of the comparison result. The expected ID value updating unit 216 does not update the expected value stored in the expected ID value storage unit 218 because the comparison results do not match.
　データ受信部２０８は、受信通知部２１０に対して、ＤＡＴフレーム５を受信したことを通知する。受信通知部２１０は、データ受信部２０８からの通知に基づいて、送受信部１００に対してＡＣＫフレーム５を送信する。データ受信部１０８は、Ｔ１１２においてＡＣＫフレーム５を受信すると、受信したＡＣＫフレーム５からフレームＩＤ「５」を取得する。データ受信部１０８は、取得したフレームＩＤをＩＤ期待値比較部１１４に出力する。ＩＤ期待値比較部１１４は、ＩＤ期待値記憶部１１８が記憶しているＡＣＫフレームＩＤ期待値「４」と比較して、比較結果をデータ受信部１０８およびＩＤ期待値更新部１１６に通知する（Ｔ１１２）。 The data reception unit 208 notifies the reception notification unit 210 that the DAT frame 5 has been received. The reception notification unit 210 transmits the ACK frame 5 to the transmission / reception unit 100 based on the notification from the data reception unit 208. When receiving the ACK frame 5 at T112, the data receiving unit 108 acquires the frame ID “5” from the received ACK frame 5. The data reception unit 108 outputs the acquired frame ID to the ID expected value comparison unit 114. The expected ID value comparison unit 114 compares the expected ACK frame ID value “4” stored in the expected ID value storage unit 118 and notifies the data reception unit 108 and the expected ID value update unit 116 of the comparison result ( T112).
　比較結果が一致しないので、ＩＤ期待値更新部１１６は、ＩＤ期待値記憶部１１８が記憶する期待値を更新しない。また、データ受信部１０８は、比較結果が一致しないことを、再送制御部１１２に通知する。再送制御部１１２は、通知に基づいて、ＤＡＴフレーム４を再送する必要があると判断し、データ送信部１０４に対して、ＤＡＴフレーム４の再送を要求する。 Since the comparison result does not match, the expected ID value update unit 116 does not update the expected value stored in the expected ID value storage unit 118. In addition, the data reception unit 108 notifies the retransmission control unit 112 that the comparison results do not match. Based on the notification, the retransmission control unit 112 determines that the DAT frame 4 needs to be retransmitted, and requests the data transmission unit 104 to retransmit the DAT frame 4.
　データ送信部１０４は、データ管理部１０２からＤＡＴフレーム４のデータを読み出して、フレームＩＤ「４」を付したＤＡＴフレーム４を生成した上で、送受信部２００に対して送信する。データ受信部２０８は、Ｔ１１３において、ＤＡＴフレーム４を受信して、受信したＤＡＴフレーム４に含まれる伝送データをデータ管理部２０２に出力する。以上の手順により、送受信部１００は、送信したＤＡＴフレーム４が送受信部２００に届かなかったことを速やかに検出して、ＤＡＴフレーム４を再送することができる。 The data transmission unit 104 reads the data of the DAT frame 4 from the data management unit 102, generates the DAT frame 4 with the frame ID “4”, and transmits the data to the transmission / reception unit 200. The data reception unit 208 receives the DAT frame 4 at T113 and outputs the transmission data included in the received DAT frame 4 to the data management unit 202. Through the above procedure, the transmission / reception unit 100 can quickly detect that the transmitted DAT frame 4 has not arrived at the transmission / reception unit 200 and retransmit the DAT frame 4.
　図１１は、送受信部１００から送受信部２００へのデータ送信において、送受信部２００が送信したＡＣＫフレームが伝送媒体４２において消失した場合のタイミングシーケンスを示す。同図では、送受信部２００は、ＤＡＴフレーム０からＤＡＴフレーム８を正常に受信している。従って、データ受信部２０８は、データ管理部２０２に対して、受信した伝送データを出力している。ところが、送受信部２００がＴ１２１において送信したＡＣＫフレーム４は、伝送媒体４２において消失している。その結果、データ受信部１０８はＡＣＫフレーム３を受信した後で、ＡＣＫフレーム５を受信している。 FIG. 11 shows a timing sequence when the ACK frame transmitted by the transmission / reception unit 200 disappears in the transmission medium 42 in the data transmission from the transmission / reception unit 100 to the transmission / reception unit 200. In the figure, the transmission / reception unit 200 normally receives DAT frame 0 to DAT frame 8. Therefore, the data reception unit 208 outputs the received transmission data to the data management unit 202. However, the ACK frame 4 transmitted by the transmission / reception unit 200 at T121 is lost in the transmission medium 42. As a result, the data receiving unit 108 receives the ACK frame 5 after receiving the ACK frame 3.
　ＡＣＫフレーム５のフレームＩＤは、ＩＤ期待値記憶部１１８が記憶しているＡＣＫフレームＩＤ期待値と異なるので、送受信部１００は、ＤＡＴフレーム４を再送する。データ受信部２０８は、ＤＡＴフレーム４を受信して、フレームＩＤ「４」を取得する。 Since the frame ID of the ACK frame 5 is different from the expected ACK frame ID value stored in the expected ID value storage unit 118, the transmission / reception unit 100 retransmits the DAT frame 4. The data receiving unit 208 receives the DAT frame 4 and acquires the frame ID “4”.
　ところが、データ受信部２０８は、既にＤＡＴフレーム４からＤＡＴフレームｘまでを正常に受信して、データ管理部２０２に対して出力しているので、ＩＤ期待値記憶部２１８には、フレームＩＤ期待値として、ｙ（＝ｘ＋１）が記憶されている。従って、データ受信部２０８は、フレームＩＤがｙであるＤＡＴフレームを受信するまでは、受信したＤＡＴフレームを破棄してよい。以上のように、送受信部１００および送受信部２００は、ＡＣＫフレームが消失した場合であっても、データを正確に送受信できる。 However, since the data reception unit 208 has already normally received the DAT frame 4 to the DAT frame x and has output them to the data management unit 202, the expected ID value storage unit 218 stores the expected frame ID value. , Y (= x + 1) is stored. Therefore, the data receiving unit 208 may discard the received DAT frame until it receives a DAT frame whose frame ID is y. As described above, the transmission / reception unit 100 and the transmission / reception unit 200 can accurately transmit / receive data even when the ACK frame is lost.
　図１２は、送受信部１００から送受信部２００にデータを送信する場合のタイミングシーケンスを示す。同図における数値の単位は、マイクロ秒である。本実施形態においては、データ伝送速度は８００Ｍｂｐｓ（１００ＭＨｚ×１Ｂｙｔｅ）、フレームのデータ長は２０４８Ｋｂｉｔ（２５６Ｂｙｔｅ）としている。この場合には、１フレームの伝送に要する時間は、２．５６マイクロ秒となる。また、送受信部１００がＤＡＴフレームを送信してから送受信部２００が受信するまでの伝送遅延時間は、３マイクロ秒であると想定している。以上の条件により、図１２においては、送受信部１００がＤＡＴフレームＡの送出を開始してから３マイクロ秒後のＴ２０１において、送受信部２００はＤＡＴフレームＡの先頭部を検出する。 FIG. 12 shows a timing sequence when data is transmitted from the transmission / reception unit 100 to the transmission / reception unit 200. The unit of numerical values in the figure is microseconds. In this embodiment, the data transmission rate is 800 Mbps (100 MHz × 1 Byte), and the frame data length is 2048 Kbit (256 Bytes). In this case, the time required to transmit one frame is 2.56 microseconds. Further, it is assumed that the transmission delay time from when the transmission / reception unit 100 transmits the DAT frame to when the transmission / reception unit 200 receives the DAT frame is 3 microseconds. Based on the above conditions, in FIG. 12, the transmission / reception unit 200 detects the leading portion of the DAT frame A at T201 three microseconds after the transmission / reception unit 100 starts transmitting the DAT frame A.
　送受信部２００は、Ｔ２０２においてフレームＩＤを検出すると、送受信部１００に対してＡＣＫフレームを送出する。送受信部１００は、送受信部１００が送出したＡＣＫフレームをＴ２０５において受信する。送受信部２００は、Ｔ２０３において、フレーム内にエラーが生じていることを検出すると、Ｔ２０４において、エラーの発生を通知する確認信号を含むＮＡＣＫフレームを送出してよい。 The transmission / reception unit 200 transmits an ACK frame to the transmission / reception unit 100 when detecting a frame ID in T202. The transmission / reception unit 100 receives the ACK frame transmitted by the transmission / reception unit 100 at T205. When detecting that an error has occurred in the frame at T203, the transmission / reception unit 200 may transmit a NACK frame including a confirmation signal notifying the occurrence of the error at T204.
　送受信部１００は、ＮＡＣＫフレームをＴ２０６において受信する。送受信部１００は、Ｔ２０６の時点で、ＤＡＴフレームＢ、Ｃ、および、Ｄを送信している。送受信部１００は、ＮＡＣＫフレームを受信した場合には、次に送信を予定していたＤＡＴフレームＥの送信を中止すると共に、ＮＡＣＫフレームが示すフレームＩＤのＤＡＴフレームを再送してよい。送受信部２００は、ＤＡＴフレームＢ、Ｃ、および、Ｄを受信すると、それらを破棄してよい。 The transmission / reception unit 100 receives the NACK frame at T206. The transmitting / receiving unit 100 transmits DAT frames B, C, and D at time T206. When the transmission / reception unit 100 receives the NACK frame, the transmission / reception unit 100 may stop transmission of the DAT frame E scheduled to be transmitted next and retransmit the DAT frame having the frame ID indicated by the NACK frame. When the transmission / reception unit 200 receives the DAT frames B, C, and D, the transmission / reception unit 200 may discard them.
　図１３は、送受信部１００から送受信部２００へのデータ送信において再送が発生した場合に、送受信部１００がタイムアウトにより再送するタイミングシーケンスを示す。同図においては、ＤＡＴフレームＡが伝送媒体４２において消失して、送受信部２００がＤＡＴフレームＡを受信できない場合を想定している。なお、図中の数値は、送受信部１００および送受信部２００が有する遅延回路の段数を示す。１段の遅延回路により１０ナノ秒の遅延を生じる。従って、遅延段数が３００の場合には、３マイクロ秒の遅延が生じることを示す。 FIG. 13 shows a timing sequence in which the transmission / reception unit 100 retransmits due to timeout when retransmission occurs in data transmission from the transmission / reception unit 100 to the transmission / reception unit 200. In the figure, it is assumed that the DAT frame A is lost in the transmission medium 42 and the transmission / reception unit 200 cannot receive the DAT frame A. Note that the numerical values in the figure indicate the number of delay circuits included in the transmission / reception unit 100 and the transmission / reception unit 200. A one-stage delay circuit causes a delay of 10 nanoseconds. Therefore, when the number of delay stages is 300, it indicates that a delay of 3 microseconds occurs.
　「再送待ち」信号は、データ受信部２０８が再送待ち状態にあることを示す信号である。データ受信部２０８は、受信することを期待していたＤＡＴフレームを受信しなかった場合に、「再送待ち」信号をＨレベルに変化させてよい。「データ出力」信号は、データ受信部２０８が受信したデータを、データ管理部２０２に出力してよいか否かを示す信号である。データ受信部２０８は、受信することを期待していたＤＡＴフレームを受信しなかった場合に、「データ出力」信号をＬレベルに変化させてよい。 The “waiting for retransmission” signal is a signal indicating that the data receiving unit 208 is in a waiting state for retransmission. The data reception unit 208 may change the “waiting for retransmission” signal to the H level when the DAT frame expected to be received is not received. The “data output” signal is a signal indicating whether or not the data received by the data reception unit 208 may be output to the data management unit 202. The data reception unit 208 may change the “data output” signal to the L level when the DAT frame expected to be received is not received.
　データ受信部２０８は、ＤＡＴフレームＸを正常に受信した時点で、データ出力信号がＨレベルになっている場合には、受信したＤＡＴフレームＸに含まれる伝送データをデータ管理部２０２出力してよい（Ｔ３０１）。その後、データ受信部２０８は、ＤＡＴフレームＡを受信することなく、Ｔ３０３においてＤＡＴフレームＢを受信する。データ受信部２０８は、ＤＡＴフレームＡを受信していないので、データ出力信号をＬレベルに変化させてデータ管理部２０２に対するデータ出力を停止してよい。また、データ受信部２０８は、ＤＡＴフレームＢ以降に受信するＤＡＴフレームを蓄積するバッファを有してよい。 The data reception unit 208 may output the transmission data included in the received DAT frame X when the data output signal is at the H level when the DAT frame X is normally received. (T301). Thereafter, the data receiving unit 208 receives the DAT frame B at T303 without receiving the DAT frame A. Since the data reception unit 208 has not received the DAT frame A, the data output signal to the data management unit 202 may be stopped by changing the data output signal to the L level. The data receiving unit 208 may include a buffer that accumulates DAT frames received after the DAT frame B.
　送受信部２００は、ＤＡＴフレームＡを正常に受信しているならば、Ｔ３０２においてＡＣＫフレームを送信する。送受信部１００は、Ｔ３０４において当該ＡＣＫフレームを受信する。ところが、送受信部２００は、ＤＡＴフレームＡを受信していないので、ＤＡＴフレームＡに対するＡＣＫフレームを送信しない。従って、送受信部１００は、Ｔ３０４においてＡＣＫフレームを受信しない。 If the DAT frame A is normally received, the transmitting / receiving unit 200 transmits an ACK frame at T302. The transmission / reception unit 100 receives the ACK frame at T304. However, since the transmitting / receiving unit 200 has not received the DAT frame A, the transmitting / receiving unit 200 does not transmit an ACK frame for the DAT frame A. Therefore, the transmission / reception unit 100 does not receive an ACK frame at T304.
　そこで、送受信部１００は、再送制御部１１２において、Ｔ３０５の時点でタイムアウトを発生させてよい。再送制御部１１２は、タイムアウトを発生させると、ＤＡＴフレームＡを再送する必要があると判断し、ＤＡＴフレームＡを再送する。再送制御部１１２は、送信したＤＡＴフレームのフレームＩＤごとに、タイムアウトを順次発生してよい。 Therefore, the transmission / reception unit 100 may cause the retransmission control unit 112 to generate a timeout at time T305. When a retransmission occurs, the retransmission control unit 112 determines that the DAT frame A needs to be retransmitted, and retransmits the DAT frame A. The retransmission control unit 112 may sequentially generate timeouts for each frame ID of the transmitted DAT frame.
　データ受信部２０８は、Ｔ３０６において、ＤＡＴフレームＡの受信を完了する。データ受信部２０８は、ＤＡＴフレームＡを受信すると、既に受信してバッファに格納していたＤＡＴフレームＢ～Ｆをデータ管理部２０２に出力してよい。データ受信部２０８がＤＡＴフレームＦのデータをデータ管理部２０２に出力する時点では、既にＤＡＴフレームＧを受信している。従って、データ受信部２０８は、ＤＡＴフレームＦのデータに続いて、ＤＡＴフレームＧのデータをデータ管理部２０２に出力してよい。 The data reception unit 208 completes reception of the DAT frame A at T306. When receiving the DAT frame A, the data receiving unit 208 may output the DAT frames B to F that have already been received and stored in the buffer to the data management unit 202. At the time when the data receiving unit 208 outputs the data of the DAT frame F to the data management unit 202, the DAT frame G has already been received. Therefore, the data reception unit 208 may output the data of the DAT frame G to the data management unit 202 following the data of the DAT frame F.
　以上の構成により、送受信部１００および送受信部２００は、送信したＤＡＴフレームまたはＡＣＫフレームが伝送媒体４２において消失した場合であっても、送信した伝送フレームが伝送媒体４２において消失したことを速やかに検出できる。さらに、送受信部１００および送受信部２００は、検出結果に応じて送信したＤＡＴフレームを再送することにより、伝送媒体４２において誤りが生じる場合であっても、確実にデータを送信できる。送受信部１００および送受信部２００が当該再送制御をするので、制御部２０において複数の試験制御プログラム２２が動作するマルチタスク環境下においても、制御部２０のパフォーマンスに影響を及ぼさない。 With the above configuration, the transmission / reception unit 100 and the transmission / reception unit 200 quickly detect that the transmitted transmission frame is lost in the transmission medium 42 even when the transmitted DAT frame or ACK frame is lost in the transmission medium 42. it can. Furthermore, the transmission / reception unit 100 and the transmission / reception unit 200 can reliably transmit data even when an error occurs in the transmission medium 42 by retransmitting the DAT frame transmitted according to the detection result. Since the transmission / reception unit 100 and the transmission / reception unit 200 perform the retransmission control, the performance of the control unit 20 is not affected even in a multitasking environment where a plurality of test control programs 22 operate in the control unit 20.
　なお、以上の説明においては、データ送信部１０４は、データ管理部１０２からデータを取得するとしたが、データ送信部１０４は、制御部２０からデータを取得してもよい。また、データ受信部２０８が受信したデータをデータ管理部２０２に出力するとしたが、データ受信部２０８は、受信したデータを試験ユニット３０に出力してもよい。 In the above description, the data transmission unit 104 acquires data from the data management unit 102, but the data transmission unit 104 may acquire data from the control unit 20. Although the data received by the data receiving unit 208 is output to the data management unit 202, the data receiving unit 208 may output the received data to the test unit 30.
　また、以上の説明においては、シリアル伝送部４０は、制御部２０および試験ユニット３０のみと接続されているとした。しかし、シリアル伝送部４０は、他の複数のシリアル伝送部と接続される構成においても、同等の効果を得ることができる。 In the above description, it is assumed that the serial transmission unit 40 is connected only to the control unit 20 and the test unit 30. However, the serial transmission unit 40 can obtain the same effect even in a configuration connected to other serial transmission units.
　さらに、以上の説明においては、１つのＤＡＴフレームに対して、１つのＡＣＫフレームを受信する場合についてのみ説明した。しかし、複数のＤＡＴフレームをバーストフレームとして扱い、１つのバーストフレームに対して、１つのＡＣＫフレームを受信する構成にしても、同等の効果を得ることができる。 Furthermore, in the above description, only the case where one ACK frame is received for one DAT frame has been described. However, even when a plurality of DAT frames are handled as burst frames and one ACK frame is received for one burst frame, the same effect can be obtained.
　図１４は、第２の実施形態に係るコンピュータ１９００のハードウェア構成の一例を示す。本実施形態に係るコンピュータ１９００は、ホスト・コントローラ２０８２により相互に接続されるＣＰＵ２０００、ＲＡＭ２０２０、グラフィック・コントローラ２０７５、及び表示装置２０８０を有するＣＰＵ周辺部と、入出力コントローラ２０８４によりホスト・コントローラ２０８２に接続される通信インターフェイス２０３０、ハードディスクドライブ２０４０、及びＣＤ－ＲＯＭドライブ２０６０を有する入出力部と、入出力コントローラ２０８４に接続されるＲＯＭ２０１０、フレキシブルディスク・ドライブ２０５０、及び入出力チップ２０７０を有するレガシー入出力部とを備える。 FIG. 14 shows an example of a hardware configuration of a computer 1900 according to the second embodiment. A computer 1900 according to this embodiment is connected to a CPU peripheral unit having a CPU 2000, a RAM 2020, a graphic controller 2075, and a display device 2080 that are connected to each other by a host controller 2082, and to the host controller 2082 by an input / output controller 2084. Input / output unit having communication interface 2030, hard disk drive 2040, and CD-ROM drive 2060, and legacy input / output unit having ROM 2010, flexible disk drive 2050, and input / output chip 2070 connected to input / output controller 2084 With.
　ホスト・コントローラ２０８２は、ＲＡＭ２０２０と、高い転送レートでＲＡＭ２０２０をアクセスするＣＰＵ２０００及びグラフィック・コントローラ２０７５とを接続する。ＣＰＵ２０００は、ＲＯＭ２０１０及びＲＡＭ２０２０に格納されたプログラムに基づいて動作し、各部の制御を行う。グラフィック・コントローラ２０７５は、ＣＰＵ２０００等がＲＡＭ２０２０内に設けたフレーム・バッファ上に生成する画像データを取得し、表示装置２０８０上に表示させる。これに代えて、グラフィック・コントローラ２０７５は、ＣＰＵ２０００等が生成する画像データを格納するフレーム・バッファを、内部に含んでもよい。 The host controller 2082 connects the RAM 2020 to the CPU 2000 and the graphic controller 2075 that access the RAM 2020 at a high transfer rate. The CPU 2000 operates based on programs stored in the ROM 2010 and the RAM 2020 and controls each unit. The graphic controller 2075 acquires image data generated by the CPU 2000 or the like on a frame buffer provided in the RAM 2020 and displays it on the display device 2080. Instead of this, the graphic controller 2075 may include a frame buffer for storing image data generated by the CPU 2000 or the like.
　入出力コントローラ２０８４は、ホスト・コントローラ２０８２と、比較的高速な入出力装置である通信インターフェイス２０３０、ハードディスクドライブ２０４０、ＣＤ－ＲＯＭドライブ２０６０を接続する。通信インターフェイス２０３０は、ネットワークを介して他の装置と通信する。ハードディスクドライブ２０４０は、コンピュータ１９００内のＣＰＵ２０００が使用するプログラム及びデータを格納する。ＣＤ－ＲＯＭドライブ２０６０は、ＣＤ－ＲＯＭ２０９５からプログラム又はデータを読み取り、ＲＡＭ２０２０を介してハードディスクドライブ２０４０に提供する。 The input / output controller 2084 connects the host controller 2082 to the communication interface 2030, the hard disk drive 2040, and the CD-ROM drive 2060, which are relatively high-speed input / output devices. The communication interface 2030 communicates with other devices via a network. The hard disk drive 2040 stores programs and data used by the CPU 2000 in the computer 1900. The CD-ROM drive 2060 reads a program or data from the CD-ROM 2095 and provides it to the hard disk drive 2040 via the RAM 2020.
　また、入出力コントローラ２０８４には、ＲＯＭ２０１０と、フレキシブルディスク・ドライブ２０５０、及び入出力チップ２０７０の比較的低速な入出力装置とが接続される。ＲＯＭ２０１０は、コンピュータ１９００が起動時に実行するブート・プログラム、及び／又は、コンピュータ１９００のハードウェアに依存するプログラム等を格納する。フレキシブルディスク・ドライブ２０５０は、フレキシブルディスク２０９０からプログラム又はデータを読み取り、ＲＡＭ２０２０を介してハードディスクドライブ２０４０に提供する。入出力チップ２０７０は、フレキシブルディスク・ドライブ２０５０を入出力コントローラ２０８４へと接続すると共に、例えばパラレル・ポート、シリアル・ポート、キーボード・ポート、マウス・ポート等を介して各種の入出力装置を入出力コントローラ２０８４へと接続する。 Also, the ROM 2010, the flexible disk drive 2050, and the relatively low-speed input / output device of the input / output chip 2070 are connected to the input / output controller 2084. The ROM 2010 stores a boot program that the computer 1900 executes at startup and / or a program that depends on the hardware of the computer 1900. The flexible disk drive 2050 reads a program or data from the flexible disk 2090 and provides it to the hard disk drive 2040 via the RAM 2020. The input / output chip 2070 connects the flexible disk drive 2050 to the input / output controller 2084 and inputs / outputs various input / output devices via, for example, a parallel port, a serial port, a keyboard port, a mouse port, and the like. Connect to controller 2084.
　ＲＡＭ２０２０を介してハードディスクドライブ２０４０に提供されるプログラムは、フレキシブルディスク２０９０、ＣＤ－ＲＯＭ２０９５、又はＩＣカード等の記録媒体に格納されて利用者によって提供される。プログラムは、記録媒体から読み出され、ＲＡＭ２０２０を介してコンピュータ１９００内のハードディスクドライブ２０４０にインストールされ、ＣＰＵ２０００において実行される。 The program provided to the hard disk drive 2040 via the RAM 2020 is stored in a recording medium such as the flexible disk 2090, the CD-ROM 2095, or an IC card and provided by the user. The program is read from the recording medium, installed in the hard disk drive 2040 in the computer 1900 via the RAM 2020, and executed by the CPU 2000.
　コンピュータ１９００にインストールされ、コンピュータ１９００を半導体試験装置１０として機能させるプログラムは、コンピュータ１９００を、制御部２０、試験ユニット３０、および、シリアル伝送部４０として機能させる。当該プログラムは、コンピュータ１９００に、受信側において伝送データを受け取った場合に、当該伝送データを受け取った旨の確認信号を送信側に送信させる受信通知モジュールと、送信側において伝送データを送信してから、予め定められた期間内に当該伝送データの確認信号を受け取らない場合に、送信側から受信側に当該伝送データを再送させる再送制御モジュールとを備える。これらのプログラム又はモジュールは、ＣＰＵ２０００等に働きかけて、コンピュータ１９００を、半導体試験装置１０としてそれぞれ機能させる。 A program installed in the computer 1900 and causing the computer 1900 to function as the semiconductor test apparatus 10 causes the computer 1900 to function as the control unit 20, the test unit 30, and the serial transmission unit 40. When the transmission data is received on the reception side, the program sends a confirmation signal indicating that the transmission data has been received to the transmission side, and after transmitting the transmission data on the transmission side. A retransmission control module for retransmitting the transmission data from the transmission side to the reception side when the confirmation signal of the transmission data is not received within a predetermined period. These programs or modules work on the CPU 2000 or the like to cause the computer 1900 to function as the semiconductor test apparatus 10.
　これらのプログラムに記述された情報処理は、コンピュータ１９００に読込まれることにより、ソフトウェアと上述した各種のハードウェア資源とが協働した具体的手段である受信通知部１１０、および、再送制御部１１２として機能する。そして、これらの具体的手段によって、本実施形態におけるコンピュータ１９００の使用目的に応じた情報の演算又は加工を実現することにより、使用目的に応じた特有の半導体試験装置１０が構築される。 The information processing described in these programs is read into the computer 1900, whereby the reception notification unit 110 and the retransmission control unit 112, which are specific means in which the software and the various hardware resources described above cooperate. Function as. And the specific semiconductor test apparatus 10 according to the use purpose is constructed | assembled by implement | achieving the calculation or processing of the information according to the use purpose of the computer 1900 in this embodiment by these concrete means.
　一例として、コンピュータ１９００と外部の装置等との間で通信を行う場合には、ＣＰＵ２０００は、ＲＡＭ２０２０上にロードされた通信プログラムを実行し、通信プログラムに記述された処理内容に基づいて、通信インターフェイス２０３０に対して通信処理を指示する。通信インターフェイス２０３０は、ＣＰＵ２０００の制御を受けて、ＲＡＭ２０２０、ハードディスクドライブ２０４０、フレキシブルディスク２０９０、又はＣＤ－ＲＯＭ２０９５等の記憶装置上に設けた送信バッファ領域等に記憶された伝送データを読み出してネットワークへと送信し、もしくは、ネットワークから受信した受信データを記憶装置上に設けた受信バッファ領域等へと書き込む。このように、通信インターフェイス２０３０は、ＤＭＡ（ダイレクト・メモリ・アクセス）方式により記憶装置との間で送受信データを転送してもよく、これに代えて、ＣＰＵ２０００が転送元の記憶装置又は通信インターフェイス２０３０からデータを読み出し、転送先の通信インターフェイス２０３０又は記憶装置へとデータを書き込むことにより送受信データを転送してもよい。 As an example, when communication is performed between the computer 1900 and an external device or the like, the CPU 2000 executes a communication program loaded on the RAM 2020 and executes a communication interface based on the processing content described in the communication program. A communication process is instructed to 2030. Under the control of the CPU 2000, the communication interface 2030 reads transmission data stored in a transmission buffer area or the like provided on a storage device such as the RAM 2020, the hard disk drive 2040, the flexible disk 2090, or the CD-ROM 2095, and sends it to the network. The reception data transmitted or received from the network is written into a reception buffer area or the like provided on the storage device. As described above, the communication interface 2030 may transfer transmission / reception data to / from the storage device by a DMA (direct memory access) method. Instead, the CPU 2000 transfers the storage device or the communication interface 2030 as a transfer source. The transmission / reception data may be transferred by reading the data from the data and writing the data to the communication interface 2030 or the storage device of the transfer destination.
　また、ＣＰＵ２０００は、ハードディスクドライブ２０４０、ＣＤ－ＲＯＭドライブ２０６０（ＣＤ－ＲＯＭ２０９５）、フレキシブルディスク・ドライブ２０５０（フレキシブルディスク２０９０）等の外部記憶装置に格納されたファイルまたはデータベース等の中から、全部または必要な部分をＤＭＡ転送等によりＲＡＭ２０２０へと読み込ませ、ＲＡＭ２０２０上のデータに対して各種の処理を行う。そして、ＣＰＵ２０００は、処理を終えたデータを、ＤＭＡ転送等により外部記憶装置へと書き戻す。 The CPU 2000 is all or necessary from among files or databases stored in an external storage device such as a hard disk drive 2040, a CD-ROM drive 2060 (CD-ROM 2095), and a flexible disk drive 2050 (flexible disk 2090). This portion is read into the RAM 2020 by DMA transfer or the like, and various processes are performed on the data on the RAM 2020. Then, CPU 2000 writes the processed data back to the external storage device by DMA transfer or the like.
　このような処理において、ＲＡＭ２０２０は、外部記憶装置の内容を一時的に保持するものとみなせるから、本実施形態においてはＲＡＭ２０２０および外部記憶装置等をメモリ、記憶部、または記憶装置等と総称する。本実施形態における各種のプログラム、データ、テーブル、データベース等の各種の情報は、このような記憶装置上に格納されて、情報処理の対象となる。なお、ＣＰＵ２０００は、ＲＡＭ２０２０の一部をキャッシュメモリに保持し、キャッシュメモリ上で読み書きを行うこともできる。このような形態においても、キャッシュメモリはＲＡＭ２０２０の機能の一部を担うから、本実施形態においては、区別して示す場合を除き、キャッシュメモリもＲＡＭ２０２０、メモリ、及び／又は記憶装置に含まれるものとする。 In such processing, since the RAM 2020 can be regarded as temporarily holding the contents of the external storage device, in the present embodiment, the RAM 2020 and the external storage device are collectively referred to as a memory, a storage unit, or a storage device. Various types of information such as various programs, data, tables, and databases in the present embodiment are stored on such a storage device and are subjected to information processing. Note that the CPU 2000 can also store a part of the RAM 2020 in the cache memory and perform reading and writing on the cache memory. Even in such a form, the cache memory bears a part of the function of the RAM 2020. Therefore, in the present embodiment, the cache memory is also included in the RAM 2020, the memory, and / or the storage device unless otherwise indicated. To do.
　また、ＣＰＵ２０００は、ＲＡＭ２０２０から読み出したデータに対して、プログラムの命令列により指定された、本実施形態中に記載した各種の演算、情報の加工、条件判断、情報の検索・置換等を含む各種の処理を行い、ＲＡＭ２０２０へと書き戻す。例えば、ＣＰＵ２０００は、条件判断を行う場合においては、本実施形態において示した各種の変数が、他の変数または定数と比較して、大きい、小さい、以上、以下、等しい等の条件を満たすかどうかを判断し、条件が成立した場合（又は不成立であった場合）に、異なる命令列へと分岐し、またはサブルーチンを呼び出す。 In addition, the CPU 2000 performs various operations, such as various operations, information processing, condition determination, information search / replacement, etc., described in the present embodiment, specified for the data read from the RAM 2020 by the instruction sequence of the program. Is written back to the RAM 2020. For example, when performing the condition determination, the CPU 2000 determines whether the various variables shown in the present embodiment satisfy the conditions such as large, small, above, below, equal, etc., compared to other variables or constants. When the condition is satisfied (or not satisfied), the program branches to a different instruction sequence or calls a subroutine.
　また、ＣＰＵ２０００は、記憶装置内のファイルまたはデータベース等に格納された情報を検索することができる。例えば、第１属性の属性値に対し第２属性の属性値がそれぞれ対応付けられた複数のエントリが記憶装置に格納されている場合において、ＣＰＵ２０００は、記憶装置に格納されている複数のエントリの中から第１属性の属性値が指定された条件と一致するエントリを検索し、そのエントリに格納されている第２属性の属性値を読み出すことにより、所定の条件を満たす第１属性に対応付けられた第２属性の属性値を得ることができる。 Further, the CPU 2000 can search for information stored in a file or database in the storage device. For example, in the case where a plurality of entries in which the attribute value of the second attribute is associated with the attribute value of the first attribute are stored in the storage device, the CPU 2000 displays the plurality of entries stored in the storage device. The entry that matches the condition in which the attribute value of the first attribute is specified is retrieved, and the attribute value of the second attribute that is stored in the entry is read, thereby associating with the first attribute that satisfies the predetermined condition The attribute value of the specified second attribute can be obtained.
　以上に示したプログラム又はモジュールは、外部の記録媒体に格納されてもよい。記録媒体としては、フレキシブルディスク２０９０、ＣＤ－ＲＯＭ２０９５の他に、ＤＶＤ又はＣＤ等の光学記録媒体、ＭＯ等の光磁気記録媒体、テープ媒体、ＩＣカード等の半導体メモリ等を用いることができる。また、専用通信ネットワーク又はインターネットに接続されたサーバシステムに設けたハードディスク又はＲＡＭ等の記憶装置を記録媒体として使用し、ネットワークを介してプログラムをコンピュータ１９００に提供してもよい。 The program or module shown above may be stored in an external recording medium. As the recording medium, in addition to the flexible disk 2090 and the CD-ROM 2095, an optical recording medium such as DVD or CD, a magneto-optical recording medium such as MO, a tape medium, a semiconductor memory such as an IC card, and the like can be used. Further, a storage device such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet may be used as a recording medium, and the program may be provided to the computer 1900 via the network.
　以上、本発明を実施の形態を用いて説明したが、本発明の技術的範囲は上記実施の形態に記載の範囲には限定されない。上記実施の形態に、多様な変更または改良を加えることが可能であることが当業者に明らかである。その様な変更または改良を加えた形態も本発明の技術的範囲に含まれ得ることが、請求の範囲の記載から明らかである。 As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.
　請求の範囲、明細書、および図面中において示した装置、システム、プログラム、および方法における動作、手順、ステップ、および段階等の各処理の実行順序は、特段「より前に」、「先立って」等と明示しておらず、また、前の処理の出力を後の処理で用いるのでない限り、任意の順序で実現しうることに留意すべきである。請求の範囲、明細書、および図面中の動作フローに関して、便宜上「まず、」、「次に、」等を用いて説明したとしても、この順で実施することが必須であることを意味するものではない。 The execution order of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior”. It should be noted that they can be implemented in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for the sake of convenience, it means that it is essential to carry out in this order. is not.
　以上のように、本発明の実施形態によれば、半導体試験装置におけるデータ伝送中にデータ誤りが生じた場合であっても、確実にデータの受け渡しを行うことができる。特に、送受信部および送受信部が当該再送制御をするので、制御部において複数の試験制御プログラムが動作するマルチタスク環境下においても、制御部のパフォーマンスに影響を及ぼさない。 As described above, according to the embodiment of the present invention, even when a data error occurs during data transmission in the semiconductor test apparatus, data can be reliably transferred. In particular, since the transmission / reception unit and the transmission / reception unit perform the retransmission control, the performance of the control unit is not affected even in a multitasking environment where a plurality of test control programs operate in the control unit.

Claims (24)

  1. 　被試験デバイスを試験する試験装置であって、
    　前記被試験デバイスと電気的に接続され、前記被試験デバイスを試験する試験ユニットと、
    　前記試験ユニットを制御する制御部と、
    　前記制御部および前記試験ユニットの間で伝送データを伝送するシリアル伝送部と
    　を備え、
    　前記シリアル伝送部は、
    　受信側において前記伝送データを受け取った場合に、当該伝送データを受け取った旨の確認信号を送信側に送信する受信通知部と、
    　前記送信側において前記伝送データを送信してから、予め定められた期間内に当該伝送データの前記確認信号を受け取らない場合に、前記送信側から前記受信側に当該伝送データを再送させる再送制御部と
    　を有する試験装置。     A test apparatus for testing a device under test,
    A test unit electrically connected to the device under test and testing the device under test;
    A control unit for controlling the test unit;
    A serial transmission unit for transmitting transmission data between the control unit and the test unit;
    The serial transmission unit is
    When receiving the transmission data on the reception side, a reception notification unit that transmits a confirmation signal to the transmission side indicating that the transmission data has been received;
    A retransmission control unit for retransmitting the transmission data from the transmission side to the reception side when the confirmation signal of the transmission data is not received within a predetermined period after the transmission data is transmitted on the transmission side And a testing apparatus having:
  2. 　前記シリアル伝送部は、それぞれの前記伝送データを識別する識別データを付して、前記伝送データを伝送し、
    　前記受信通知部は、受け取った前記伝送データの前記識別データを含む前記確認信号を前記送信側に送信する
    　請求項１に記載の試験装置。     The serial transmission unit attaches identification data for identifying the transmission data, and transmits the transmission data.
    The test apparatus according to claim 1, wherein the reception notification unit transmits the confirmation signal including the identification data of the received transmission data to the transmission side.
  3. 　前記再送制御部は、前記送信側において前記伝送データを送信してから、予め定められた期間内に当該伝送データの前記識別データを含む前記確認信号を受け取らない場合に、前記送信側から前記受信側に当該伝送データを再送させる
    　請求項２に記載の試験装置。     When the retransmission control unit does not receive the confirmation signal including the identification data of the transmission data within a predetermined period after transmitting the transmission data on the transmission side, the retransmission control unit receives the reception signal from the transmission side. The test apparatus according to claim 2, wherein the transmission data is retransmitted on the side.
  4. 　前記シリアル伝送部は、前記受信側において、前記受信通知部が送信した前記確認信号の前記識別データと同一の前記識別データが付された前記伝送データを再度受け取った場合に、再度受け取った前記伝送データを破棄するデータ受信部を更に有し、
    　前記受信通知部は、再度受け取った前記伝送データについて、前記確認信号を前記送信側に送信する
    　請求項３に記載の試験装置。     The serial transmission unit receives the transmission again when the transmission side receives the transmission data with the same identification data as the identification data of the confirmation signal transmitted by the reception notification unit on the reception side. A data receiving unit for discarding data;
    The test apparatus according to claim 3, wherein the reception notification unit transmits the confirmation signal to the transmission side for the transmission data received again.
  5. 　前記シリアル伝送部は、前記送信側において、順次送信される前記伝送データに付される前記識別データを、前記伝送データ毎に予め定められた規則で変化させるデータ送信部を更に有し、
    　前記データ受信部は、受け取った前記伝送データの前記識別データが、前記予め定められた規則により定まる前記識別データと異なる場合に、後段の回路への前記伝送データの出力を停止する
    　請求項４に記載の試験装置。     The serial transmission unit further includes, on the transmission side, a data transmission unit that changes the identification data attached to the transmission data sequentially transmitted according to a predetermined rule for each transmission data,
    The data reception unit stops output of the transmission data to a subsequent circuit when the identification data of the received transmission data is different from the identification data determined by the predetermined rule. The test apparatus described.
  6. 　前記データ受信部は、前記予め定められた規則により定まる前記識別データが付された前記伝送データを受け取った場合に、後段の回路への前記伝送データの出力を再開する
    　請求項５に記載の試験装置。     The test according to claim 5, wherein the data receiving unit restarts output of the transmission data to a subsequent circuit when receiving the transmission data to which the identification data determined by the predetermined rule is added. apparatus.
  7. 　前記再送制御部は、次に送信すべき前記伝送データが前記データ送信部に与えられていない場合に、次に送信すべき前記伝送データが前記データ送信部に与えられるまで、直前に送信した前記伝送データを前記受信側に再送させ続ける
    　請求項６に記載の試験装置。     The retransmission control unit, when the transmission data to be transmitted next is not given to the data transmission unit, until the transmission data to be transmitted next is given to the data transmission unit, The test apparatus according to claim 6, wherein transmission data is continuously retransmitted to the reception side.
  8. 　前記シリアル伝送部は、
    　前記受信側において受け取った前記伝送データに付されるべき前記識別データの期待値を記憶するデータＩＤ期待値記憶部と、
    　前記受信側において受け取った前記伝送データに付されている前記識別データを、前記データＩＤ期待値記憶部が記憶している前記期待値と比較するデータＩＤ期待値比較部と、
    　前記受信側において受け取った前記伝送データに付されている前記識別データが、前記データＩＤ期待値記憶部が記憶している前記期待値と一致した場合に、前記データＩＤ期待値記憶部が記憶する前記期待値を、前記予め定められた規則に基づいて更新するデータＩＤ期待値更新部と
    　を更に有する請求項７に記載の試験装置。     The serial transmission unit is
    A data ID expected value storage unit for storing an expected value of the identification data to be attached to the transmission data received at the receiving side;
    A data ID expected value comparison unit that compares the identification data attached to the transmission data received at the receiving side with the expected value stored in the data ID expected value storage unit;
    The data ID expected value storage unit stores the identification data attached to the transmission data received on the receiving side when the expected value stored in the data ID expected value storage unit matches the expected value. The test apparatus according to claim 7, further comprising: a data ID expected value update unit that updates the expected value based on the predetermined rule.
  9. 　前記データ受信部は、前記データＩＤ期待値比較部における比較結果に基づいて、後段の回路へ前記伝送データを出力するか否かを制御する
    　請求項８に記載の試験装置。     The test apparatus according to claim 8, wherein the data receiving unit controls whether to output the transmission data to a subsequent circuit based on a comparison result in the data ID expected value comparison unit.
  10. 　前記シリアル伝送部は、
    　前記送信側において受け取った前記確認信号に付されるべき前記識別データの期待値を記憶する確認ＩＤ期待値記憶部と、
    　前記送信側において受け取った前記確認信号に付されている前記識別データを、前記確認ＩＤ期待値記憶部が記憶している前記期待値と比較する確認ＩＤ期待値比較部と、
    　前記送信側において受け取った前記確認信号に付されている前記識別データが、前記確認ＩＤ期待値記憶部が記憶している前記期待値と一致した場合に、前記確認ＩＤ期待値記憶部が記憶する前記期待値を、前記予め定められた規則に基づいて更新する確認ＩＤ期待値更新部と
    　を更に有する請求項９に記載の試験装置。     The serial transmission unit is
    A confirmation ID expected value storage unit that stores an expected value of the identification data to be attached to the confirmation signal received on the transmission side;
    A confirmation ID expected value comparison unit that compares the identification data attached to the confirmation signal received on the transmission side with the expected value stored in the confirmation ID expected value storage unit;
    When the identification data attached to the confirmation signal received on the transmission side matches the expected value stored in the confirmation ID expected value storage unit, the confirmation ID expected value storage unit stores the identification data. The test apparatus according to claim 9, further comprising: a confirmation ID expected value update unit that updates the expected value based on the predetermined rule.
  11. 　前記再送制御部は、前記送信側において受け取った前記確認信号に付されている前記識別データが前記期待値と一致しない場合に、前記期待値に応じた前記伝送データから、順次前記伝送データを再送させる
    　請求項１０に記載の試験装置。     The retransmission control unit retransmits the transmission data sequentially from the transmission data according to the expected value when the identification data attached to the confirmation signal received at the transmission side does not match the expected value. The test apparatus according to claim 10.
  12. 　受信側および送信側の間で伝送データを伝送するシリアル伝送システムであって、
    　受信側において前記伝送データを受け取った場合に、当該伝送データを受け取った旨の確認信号を送信側に送信する受信通知部と、
    　前記送信側において前記伝送データを送信してから、予め定められた期間内に当該伝送データの前記確認信号を受け取らない場合に、前記送信側から前記受信側に当該伝送データを再送させる再送制御部と
    　を備えるシリアル伝送システム。     A serial transmission system for transmitting transmission data between a reception side and a transmission side,
    When receiving the transmission data on the reception side, a reception notification unit that transmits a confirmation signal to the transmission side indicating that the transmission data has been received;
    A retransmission control unit for retransmitting the transmission data from the transmission side to the reception side when the confirmation signal of the transmission data is not received within a predetermined period after the transmission data is transmitted on the transmission side And a serial transmission system.
  13. 　前記シリアル伝送システムは、それぞれの前記伝送データを識別する識別データを付して、前記伝送データを伝送し、
    　前記受信通知部は、受け取った前記伝送データの前記識別データを含む前記確認信号を前記送信側に送信する
    　請求項１２に記載のシリアル伝送システム。     The serial transmission system attaches identification data for identifying the transmission data, and transmits the transmission data.
    The serial transmission system according to claim 12, wherein the reception notification unit transmits the confirmation signal including the identification data of the received transmission data to the transmission side.
  14. 　前記再送制御部は、前記送信側において前記伝送データを送信してから、予め定められた期間内に当該伝送データの前記識別データを含む前記確認信号を受け取らない場合に、前記送信側から前記受信側に当該伝送データを再送させる
    　請求項１３に記載のシリアル伝送システム。     When the retransmission control unit does not receive the confirmation signal including the identification data of the transmission data within a predetermined period after transmitting the transmission data on the transmission side, the retransmission control unit receives the reception signal from the transmission side. The serial transmission system according to claim 13, wherein the transmission data is retransmitted on the side.
  15. 　前記受信側において、前記受信通知部が送信した前記確認信号の前記識別データと同一の前記識別データが付された前記伝送データを再度受け取った場合に、再度受け取った前記伝送データを破棄するデータ受信部を更に備え、
    　前記受信通知部は、再度受け取った前記伝送データについて、前記確認信号を前記送信側に送信する
    　請求項１４に記載のシリアル伝送システム。     In the receiving side, when the transmission data to which the same identification data as the identification data of the confirmation signal transmitted by the reception notification unit is received is received again, data reception for discarding the received transmission data again Further comprising
    The serial transmission system according to claim 14, wherein the reception notification unit transmits the confirmation signal to the transmission side for the transmission data received again.
  16. 　前記送信側において、順次送信される前記伝送データに付される前記識別データを、前記伝送データ毎に予め定められた規則で変化させるデータ送信部を更に備え、
    　前記データ受信部は、受け取った前記伝送データの前記識別データが、前記予め定められた規則により定まる前記識別データと異なる場合に、後段の回路への前記伝送データの出力を停止する
    　請求項１５に記載のシリアル伝送システム。     The transmission side further includes a data transmission unit that changes the identification data attached to the transmission data that is sequentially transmitted according to a predetermined rule for each transmission data,
    The data reception unit stops output of the transmission data to a subsequent circuit when the identification data of the received transmission data is different from the identification data determined by the predetermined rule. The serial transmission system described.
  17. 　前記データ受信部は、前記予め定められた規則により定まる前記識別データが付された前記伝送データを受け取った場合に、後段の回路への前記伝送データの出力を再開する
    　請求項１６に記載のシリアル伝送システム。     The serial number according to claim 16, wherein the data receiving unit resumes outputting the transmission data to a subsequent circuit when receiving the transmission data to which the identification data determined by the predetermined rule is added. Transmission system.
  18. 　前記再送制御部は、次に送信すべき前記伝送データが前記データ送信部に与えられていない場合に、次に送信すべき前記伝送データが前記データ送信部に与えられるまで、直前に送信した前記伝送データを前記受信側に再送させ続ける
    　請求項１７に記載のシリアル伝送システム。     The retransmission control unit, when the transmission data to be transmitted next is not given to the data transmission unit, until the transmission data to be transmitted next is given to the data transmission unit, The serial transmission system according to claim 17, wherein transmission data is continuously retransmitted to the reception side.
  19. 　前記受信側において受け取った前記伝送データに付されるべき前記識別データの期待値を記憶するデータＩＤ期待値記憶部と、
    　前記受信側において受け取った前記伝送データに付されている前記識別データを、前記データＩＤ期待値記憶部が記憶している前記期待値と比較するデータＩＤ期待値比較部と、
    　前記受信側において受け取った前記伝送データに付されている前記識別データが、前記データＩＤ期待値記憶部が記憶している前記期待値と一致した場合に、前記データＩＤ期待値記憶部が記憶する前記期待値を、前記予め定められた規則に基づいて更新するデータＩＤ期待値更新部と
    　を更に備える請求項１８に記載のシリアル伝送システム。     A data ID expected value storage unit for storing an expected value of the identification data to be attached to the transmission data received at the receiving side;
    A data ID expected value comparison unit that compares the identification data attached to the transmission data received at the receiving side with the expected value stored in the data ID expected value storage unit;
    The data ID expected value storage unit stores the identification data attached to the transmission data received on the receiving side when the expected value stored in the data ID expected value storage unit matches the expected value. The serial transmission system according to claim 18, further comprising: a data ID expected value update unit that updates the expected value based on the predetermined rule.
  20. 　前記データ受信部は、前記データＩＤ期待値比較部における比較結果に基づいて、後段の回路へ前記伝送データを出力するか否かを制御する
    　請求項１９に記載のシリアル伝送システム。     The serial transmission system according to claim 19, wherein the data receiving unit controls whether or not to output the transmission data to a subsequent circuit based on a comparison result in the data ID expected value comparison unit.
  21. 　前記送信側において受け取った前記確認信号に付されるべき前記識別データの期待値を記憶する確認ＩＤ期待値記憶部と、
    　前記送信側において受け取った前記確認信号に付されている前記識別データを、前記確認ＩＤ期待値記憶部が記憶している前記期待値と比較する確認ＩＤ期待値比較部と、
    　前記送信側において受け取った前記確認信号に付されている前記識別データが、前記確認ＩＤ期待値記憶部が記憶している前記期待値と一致した場合に、前記確認ＩＤ期待値記憶部が記憶する前記期待値を、前記予め定められた規則に基づいて更新する確認ＩＤ期待値更新部と
    　を更に備える請求項２０に記載のシリアル伝送システム。     A confirmation ID expected value storage unit that stores an expected value of the identification data to be attached to the confirmation signal received on the transmission side;
    A confirmation ID expected value comparison unit that compares the identification data attached to the confirmation signal received on the transmission side with the expected value stored in the confirmation ID expected value storage unit;
    When the identification data attached to the confirmation signal received on the transmission side matches the expected value stored in the confirmation ID expected value storage unit, the confirmation ID expected value storage unit stores the identification data. The serial transmission system according to claim 20, further comprising: a confirmation ID expected value update unit that updates the expected value based on the predetermined rule.
  22. 　前記再送制御部は、前記送信側において受け取った前記確認信号に付されている前記識別データが前記期待値と一致しない場合に、前記期待値に応じた前記伝送データから、順次前記伝送データを再送させる
    　請求項２１に記載のシリアル伝送システム。     The retransmission control unit retransmits the transmission data sequentially from the transmission data according to the expected value when the identification data attached to the confirmation signal received at the transmission side does not match the expected value. The serial transmission system according to claim 21.
  23. 　被試験デバイスを試験する試験装置を機能させるプログラムであって、
    　前記試験装置を、
    　前記被試験デバイスと電気的に接続され、前記被試験デバイスを試験する試験ユニットと、
    　前記試験ユニットを制御する制御部と、
    　前記制御部および前記試験ユニットの間で伝送データを伝送するシリアル伝送部と
    　して機能させ、
    　前記シリアル伝送部を、
    　受信側において前記伝送データを受け取った場合に、当該伝送データを受け取った旨の確認信号を送信側に送信する受信通知部と、
    　前記送信側において前記伝送データを送信してから、予め定められた期間内に当該伝送データの前記確認信号を受け取らない場合に、前記送信側から前記受信側に当該伝送データを再送させる再送制御部と
    　して機能させるプログラム。     A program for operating a test apparatus for testing a device under test,
    The test apparatus
    A test unit electrically connected to the device under test and testing the device under test;
    A control unit for controlling the test unit;
    Function as a serial transmission unit for transmitting transmission data between the control unit and the test unit;
    The serial transmission unit,
    When receiving the transmission data on the reception side, a reception notification unit that transmits a confirmation signal to the transmission side indicating that the transmission data has been received;
    A retransmission control unit for retransmitting the transmission data from the transmission side to the reception side when the confirmation signal of the transmission data is not received within a predetermined period after the transmission data is transmitted on the transmission side A program that functions as a program.
  24. 　請求項２３に記載のプログラムを記録した記録媒体。 A recording medium on which the program according to claim 23 is recorded.
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JPH02100538A (en) * 1988-10-07 1990-04-12 Japan Radio Co Ltd Data communication method for local area network
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