JP2004030172A - Inspection method and inspection device for usb standard communication function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To conduct an inspection of abnormal sequence when communication is actually carried out between a USB host unit and a USB device unit. <P>SOLUTION: An inspection device is equipped with a control means 121 which previously sets a packet, of USB standard, for which abnormal data are to be generated; bus monitor means 123, 124 which monitor signals on USB and detect a packet based on the USB standard; a transaction management means 122 which verifies whether or not the detected packet of the USB standard matches with a packet of the USB standard for which the abnormal data that is set by the control means 121 should be generated; and an error generation means 125 which generates the abnormal data if the matching is verified. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inspection method and an inspection apparatus for a USB standard communication function for generating abnormal data in order to verify an abnormal sequence between a USB host device and a USB device device connected by a USB (Universal Serial Bus) cable.
[0002]
[Prior art]
Conventionally, in an abnormal sequence verification in a USB host device and a USB device device, a user-programmable signal generator conforming to the USB standard is used in order to generate an error for each test. The USB signal generation device is connected as a counterpart of the device to be inspected, and when testing a USB host device, as shown in FIG. 5, the USB host device 500 is connected to the USB signal generation device 501 to test the USB device device. In this case, the USB device 601 is connected to the USB signal generator 600 as shown in FIG.
[0003]
The USB signal generator shown in FIGS. 5 and 6 is programmed in advance with a command or a bit string so that it operates virtually as a communication partner of the device under test, and generates a USB signal based on the program content. The USB signal was generated from the device. When abnormal data is generated, an error is generated by programming an error pattern in advance as program contents.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional method, only the operation of the communication pattern programmed in advance is performed because of the user-programmable USB signal generator. For this reason, the operation timing of the USB signal generation device is not the operation at the timing of executing the actual packet communication between the USB host device and the USB device device, and the operation timing of the USB signal generation device is to transmit and receive the packet to the USB host device or the USB device device. It differs from the actual operation timing.
[0005]
Further, even in a form in which an actual USB host device and a USB device device are connected, PID (packet identifier) and CRC based on the USB standard are assigned by hardware, so that abnormal data is intentionally created and abnormal data is generated. It is difficult to inspect the sequence.
[0006]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and has a USB standard communication function capable of inspecting an abnormal sequence in a state where communication is actually performed between a USB host device and a USB device device. It is an object to provide an inspection device and an inspection method.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, a method for testing a USB standard communication function according to claim 1 provides a communication method between a USB standard host device and a USB standard device device connected to each other via a USB standard cable. This is a test method of a USB standard communication function for generating abnormal data in data, in which a USB standard packet in which abnormal data is to be generated is set in advance (procedure 200), and a signal on a USB bus is monitored to comply with the USB standard. A packet is detected (step 201), and it is verified whether or not the detected USB standard packet matches a preset USB standard packet that should cause abnormal data (step 202). In some cases, abnormal data is generated (step 203).
[0008]
According to a third aspect of the present invention, there is provided an inspection apparatus for a USB standard communication function, which generates abnormal data in communication data between a USB standard host device and a USB standard device connected to each other via a USB standard cable. An inspection device (error generation device 120) having a USB standard communication function, which includes a control unit (control unit 121) for setting in advance a USB standard packet in which abnormal data is to be generated, and a USB device which monitors a signal on a USB bus and monitors the signal. Packet detecting means (bus monitoring means 123, 124) for detecting a packet based on the standard; and a USB standard packet detected by the packet detecting means, the USB standard packet which is to generate abnormal data set by the control means. Transaction management means (transaction management) that verifies whether a packet matches A stage 122), wherein the matching by the transaction management means is provided with an abnormal data generation means for generating an error data when it is verified (the error generating means 125).
[0009]
According to the above configuration, an abnormal sequence can be inspected during actual communication by generating abnormal data for a predetermined packet that should cause an error between the USB host device and the USB device device.
[0010]
The USB standard communication function inspection method according to claim 2, wherein the USB standard generates abnormal data in communication data between the USB standard host device and the USB standard device connected to each other via a USB standard cable. This is a communication function inspection method, in which a USB standard packet for generating abnormal data is set in advance (procedure 400), and USB communication data between the USB host device and the USB device device is obtained (procedure 401). ), A signal on the USB bus is monitored to detect a packet based on the USB standard (procedure 402), and whether the detected USB standard packet matches a predetermined USB standard packet that should generate abnormal data. Verifying whether or not there is no match (step 403), and generating abnormal data when the match is verified (step 404) And it features.
[0011]
In addition, a USB standard communication function inspection device (error) that generates abnormal data in communication data between a USB standard host device and a USB standard device device connected to each other via a USB standard cable according to claim 4. A control unit (control unit 321) for setting in advance a USB standard packet in which abnormal data is to be generated, and receiving the notification from the control unit, the USB host device and the USB device device Log management means (log management means 326) for acquiring USB communication data between the two, and packet detection means (bus monitoring means 323, 324) for monitoring signals on the USB bus and detecting packets based on the USB standard. The packet of the USB standard detected by the packet detection means is transmitted to Transaction management means (transaction management means 322) for verifying whether or not the packet matches a USB standard packet for which data is to be generated, and abnormal data generation means for generating abnormal data when the transaction management means verifies the match ( Error generating means 325).
[0012]
According to the above configuration, an abnormal sequence can be inspected during actual communication by generating abnormal data for a predetermined packet that should cause an error between the USB host device and the USB device device. Further, a record on the receiving side of the USB communication can be obtained.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of an inspection device for a USB standard communication function according to the first embodiment of the present invention. In FIG. 1, a USB error generating device 120 which is a testing device of a USB standard communication function connected to the USB host device 100 and the USB device device 101 via the USB cables 114 and 115 conforms to a USB standard that generates abnormal data. A control unit 121 for setting a packet based on the USB signal; a transaction management unit 122 for monitoring whether the USB signal is a packet based on the USB standard and a packet that should include abnormal data; Bus monitoring means 123 and 124 for outputting corresponding USB signals to the transaction management means 122; and error generating means 125 for generating abnormal data.
[0014]
The control unit 121 sets a packet based on the USB standard for generating abnormal data and a bit time for generating abnormal data. The transaction management unit 122 acquires USB bus signals from the bus monitoring unit 123 and the bus monitoring unit 124. In the USB communication between the USB host device 100 and the USB device device 101, first, packet transmission from the host device 100 is performed by scheduling of the host device 100. Thereafter, the transaction management unit 122 determines the communication direction of the next packet by interpreting the current USB communication. As a result, at the time of USB communication, a USB bus signal is obtained from the bus monitor located on the transmitting side.
[0015]
When the transaction management unit 122 recognizes that the USB signal obtained from the bus monitoring units 123 and 124 is a packet based on the USB standard, the transaction management unit 122 further converts this packet into a packet that causes the control unit 121 to generate abnormal data. It is verified whether the packet is set as a packet based on the USB standard, and when it is determined that the packet is set as a packet based on the USB standard, a notification for starting the generation of abnormal data is sent to the error generating unit 125. Send out.
[0016]
The bus monitoring unit 123 is provided on the USB host device 100 side with respect to the error generating unit 125 in order to monitor a packet transmitted from the USB host device 100. The bus monitor 124 is provided on the USB device 101 side with respect to the error generator 125 in order to monitor a packet transmitted from the USB device 101.
[0017]
The error generating means 125 generates abnormal data in response to the notification from the transaction management means 122. In the error generating means 125, there are two methods for generating abnormal data.
[0018]
One is to set the signals 110 (D +) and 111 (D−) or the signals 112 (D +) and 113 (D−) based on the USB standard to GND (ground) for a bit time set in the control unit 121, This is to set the state to SE0 based on the USB standard.
[0019]
The other is to invert the levels of the signals 110 (D +) and 111 (D−) or the signals 112 (D +) and 113 (D−) based on the USB standard by the bit time set in the control unit 121. It is.
[0020]
Examples of the abnormal sequence include a CRC error and a PID error. The CRC error can be caused by generating abnormal data in the data area of the data packet based on the USB standard. When a CRC error is generated on the USB host device 100 side, abnormal data is transmitted on a signal line of signals 110 (D +) and 111 (D−) based on the USB standard with respect to a data packet transmitted from the USB device device 101 side. It can be generated. Similarly, when a CRC error is generated on the USB device 101 side, a data packet transmitted from the USB host apparatus 100 side is transmitted on the signal lines of signals 112 (D +) and 113 (D−) based on the USB standard. What is necessary is just to generate abnormal data.
[0021]
A PID error can be caused by generating abnormal data for a packet identification field in each packet. For example, when a PID error occurs on the USB host device 100 side, signals 110 (D +) and 111 (D−) based on the USB standard are applied to a packet identification field in each packet transmitted from the USB device device 101 side. ) May be generated on the signal line. Similarly, in the case of a PID error generated on the USB device 101 side, the signal 112 (D +) and 113 (D−) based on the USB standard are applied to the packet identification field in each packet transmitted from the USB host device 100 side. ) May be forcibly generated abnormal data on the signal line.
[0022]
Hereinafter, the operation of the inspection apparatus of the USB standard communication function according to the first embodiment of the present invention will be described with reference to the flowchart shown in FIG. First, according to the procedure 200, the control unit 121 sets a packet for generating abnormal data and a bit time for generating abnormal data. Next, according to the procedure 201, the bus monitoring means 123 and 124 monitor the USB bus, whereby the transaction management unit 122 recognizes the packet based on the USB standard.
[0023]
In step 202, the transaction management unit 122 verifies whether the packet set in step 200 and the packet recognized in step 201 match, and when the two match, the error management unit 125 A notification of a start instruction for generating abnormal data is transmitted. In step 203, the error generating means 125 generates abnormal data.
[0024]
As described above, according to the first embodiment, abnormal data is generated for a predetermined packet that should cause an error during USB communication on a bus between devices having a USB communication function, Inspection of abnormal sequences between devices can be performed without making any changes to each of the devices.
[0025]
FIG. 3 is a block diagram illustrating a configuration of a USB standard communication function inspection apparatus according to the second embodiment of the present invention. In FIG. 3, a USB error generating device 320, which is an inspection device of a USB standard communication function connected to the USB host device 300 and the USB device device 301 via the USB cables 314 and 315, conforms to a USB standard that generates abnormal data. A control unit 321 for setting a packet based on the USB bus; a transaction management unit 322 for monitoring whether the USB signal is a packet based on the USB standard and a packet that should include abnormal data; Bus monitoring means 323 and 224 for outputting a corresponding USB signal to the transaction management means 122, an error generation means 325 for generating abnormal data, and a log management means for acquiring and storing a USB communication log 326.
[0026]
The control unit 321 sets a packet based on the USB standard for generating abnormal data and a bit time for generating abnormal data. The transaction management unit 132 acquires USB bus signals from the bus monitoring unit 323 and the bus monitoring unit 324. In the USB communication between the USB host device 300 and the USB device device 301, first, packet transmission from the host device 300 is performed by the scheduling of the host device 300. Thereafter, the transaction management means 322 determines the communication direction of the next packet by interpreting the current USB communication. As a result, at the time of USB communication, a USB bus signal is obtained from the bus monitor located on the transmitting side.
[0027]
When the transaction management unit 322 recognizes that the USB signal obtained from the bus monitoring units 323 and 324 is a packet based on the USB standard, the transaction management unit 322 further converts this packet into a packet that causes the control unit 321 to generate abnormal data. It is verified whether or not the packet is set as a packet based on the USB standard. If it is determined that the packet is set as a packet based on the USB standard, a notification for starting the generation of abnormal data is sent to the error generating unit 325. Send out.
[0028]
The bus monitoring unit 323 is provided on the USB host device 300 side with respect to the error generating unit 325 in order to monitor a packet transmitted from the USB host device 300. The bus monitor 324 is provided on the USB device 301 side with respect to the error generator 325 in order to monitor a packet transmitted from the USB device 301.
[0029]
The error generator 325 generates abnormal data in response to the notification from the transaction manager 322. In the error generating means 325, there are two methods for generating abnormal data.
[0030]
One is to set the signal 310 (D +), 311 (D−) or the signal 312 (D +), 313 (D−) based on the USB standard to GND (ground) for a bit time set in the control unit 321, This is to set the state to SE0 based on the USB standard.
[0031]
The other is to invert the level of the signal 310 (D +), 311 (D−), or the signal 312 (D +), 313 (D−) based on the USB standard by the bit time set in the control unit 321. It is.
[0032]
Examples of the abnormal sequence include a CRC error and a PID error. The CRC error can be caused by generating abnormal data in the data area of the data packet based on the USB standard. When a CRC error is generated on the USB host device 300 side, abnormal data is transmitted on a signal line of signals 310 (D +) and 111 (D−) based on the USB standard with respect to a data packet transmitted from the USB device device 301 side. It can be generated. Similarly, when a CRC error is generated on the USB device device 101 side, a data packet transmitted from the USB host device 100 side is transmitted on the signal lines of the signals 312 (D +) and 113 (D−) based on the USB standard. What is necessary is just to generate abnormal data.
[0033]
A PID error can be caused by generating abnormal data for a packet identification field in each packet. For example, when a PID error occurs on the USB host device 300 side, the signal 310 (D +) and 311 (D−) based on the USB standard are applied to the packet identification field in each packet transmitted from the USB device device 301 side. ) May be generated on the signal line. Similarly, in the case of a PID error generated on the USB device 301 side, the signal 312 (D +), 313 (D−) based on the USB standard is applied to the packet identification field in each packet transmitted from the USB host device 300 side. ) May be forcibly generated abnormal data on the signal line.
[0034]
The log management unit 326 acquires and stores a USB communication log based on the notification from the control unit 321. At this time, the log management unit 326 determines the receiving side by interpreting the current USB communication, acquires a USB signal from the bus monitoring unit on the receiving side, and stores it.
[0035]
Hereinafter, the operation of the inspection apparatus for the USB standard communication function according to the second embodiment of the present invention will be described with reference to the flowchart shown in FIG. First, the control unit 321 sets a packet for generating abnormal data and a bit time for generating abnormal data according to the procedure. In addition, a notification for starting acquisition and storage of the USB communication log is sent to the log management unit 326. Next, the log management unit 326 receives the USB communication log acquisition and storage start notification from the control unit 321 in accordance with the procedure 401, interprets the current USB communication, determines the receiving side, and determines the bus monitor of the receiving side. Obtain and store the USB signal from the means. In step 402, the bus monitoring units 323 and 324 monitor the USB bus, and thereby the transaction management unit 322 recognizes a packet based on the USB standard.
[0036]
In step 403, the transaction management means 322 verifies whether the packet set in step 400 matches the packet recognized in step 402, and when the two match, the error management device 325 is notified. A notification of a start instruction for generating abnormal data is transmitted. In step 404, the error generator 325 generates abnormal data.
[0037]
As described above, according to the second embodiment, abnormal data is generated for a predetermined packet that should cause an error during USB communication on a bus between devices having a USB communication function, Can be checked for an abnormal sequence between the devices without making any change, and a record on the receiving side of the USB communication between the devices having the USB communication function can be obtained.
[0038]
【The invention's effect】
As described above, according to the present invention, abnormal data is generated between a USB host device and a USB device device for a predetermined packet in which an error is to be generated. Can be inspected.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an inspection apparatus for a USB standard communication function according to a first embodiment of the present invention.
FIG. 2 is a flowchart illustrating an operation of the inspection apparatus for the USB standard communication function according to the first embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration of an inspection apparatus for a USB standard communication function according to a second embodiment of the present invention.
FIG. 4 is a flowchart illustrating an operation of the inspection apparatus for the USB standard communication function according to the second embodiment of the present invention.
FIG. 5 is a diagram illustrating verification of a conventional USB host device.
FIG. 6 is a diagram illustrating verification of a conventional USB device device.
[Explanation of symbols]
100, 300 USB host device 101, 301 USB device device 110, 112, 310, 312 D + signal line 111, 113, 311, 313 based on USB standard D- signal line 114, 115, 314, 315 USB cable based on USB standard 120, 320 USB error generator 121, 321 Control unit 122, 322 Transaction management unit 123, 124, 323, 324 Bus monitor unit 125, 325 Error generation unit 326 Log management unit

Claims (8)

An inspection method of a USB standard communication function for generating abnormal data in communication data between a USB standard host device and a USB standard device device connected to each other via a USB standard cable,
A USB standard packet for which abnormal data should be generated is set in advance, a signal on the USB bus is monitored to detect a packet based on the USB standard, and the detected USB standard packet generates predetermined abnormal data. A method of testing a USB standard communication function, comprising verifying whether a packet conforms to a USB standard packet and generating abnormal data when the match is verified. An inspection method of a USB standard communication function for generating abnormal data in communication data between a USB standard host device and a USB standard device device connected to each other via a USB standard cable,
A packet of the USB standard in which abnormal data is to be generated is set in advance, USB communication data between the USB host device and the USB device device is obtained, a signal on the USB bus is monitored, and a packet based on the USB standard is transmitted. Detecting and detecting whether the detected USB standard packet matches a predetermined USB standard packet that should generate abnormal data, and generating abnormal data when the match is verified. Method for testing USB standard communication functions. An inspection apparatus of a USB standard communication function for generating abnormal data in communication data between a USB standard host device and a USB standard device device connected to each other via a USB standard cable,
Control means for setting in advance a USB standard packet to generate abnormal data;
Packet detection means for monitoring a signal on the USB bus to detect a packet based on the USB standard;
Transaction management means for verifying whether the USB-standard packet detected by the packet detection means matches a USB-standard packet that should cause abnormal data set by the control means,
Abnormal data generating means for generating abnormal data when a match is verified by the transaction management means;
An inspection apparatus for a USB standard communication function, comprising: An inspection apparatus of a USB standard communication function for generating abnormal data in communication data between a USB standard host device and a USB standard device device connected to each other via a USB standard cable,
Control means for setting in advance a USB standard packet to generate abnormal data;
Log management means for receiving a notification from the control means and acquiring USB communication data between the USB host device and the USB device device;
Packet detection means for monitoring a signal on the USB bus to detect a packet based on the USB standard;
Transaction management means for verifying whether the USB-standard packet detected by the packet detection means matches a USB-standard packet that should cause abnormal data set by the control means,
Abnormal data generating means for generating abnormal data when a match is verified by the transaction management means;
An inspection apparatus for a USB standard communication function, comprising: 2. The apparatus according to claim 1, wherein the packet detection unit includes a monitoring unit that monitors the USB bus, and a detection unit that recognizes a signal output from the monitoring unit and detects a packet based on the USB standard. The inspection device of the USB standard communication function described in 3 or 4. 6. The transaction management unit according to claim 3, further comprising: a sending unit that sends a notification to the abnormal data generating unit to generate abnormal data when the match is verified. Inspection device for the USB standard communication function described in the paragraph. 4. The abnormal data generating unit sets the signal lines D + and D- based on the USB standard to the GND state for a bit time set by the control unit, and sets the signal lines D + and D- to the SE0 state based on the USB standard. 7. The inspection device for a USB standard communication function according to any one of items 1 to 6. 7. The abnormal data generating unit according to claim 3, wherein the signal level of the signal lines D + and D- based on the USB standard is inverted by a bit time set by the control unit. Inspection device for the USB standard communication function described.

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