WO2010067558A1 - 試験装置および試験方法 - Google Patents
試験装置および試験方法 Download PDFInfo
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- WO2010067558A1 WO2010067558A1 PCT/JP2009/006610 JP2009006610W WO2010067558A1 WO 2010067558 A1 WO2010067558 A1 WO 2010067558A1 JP 2009006610 W JP2009006610 W JP 2009006610W WO 2010067558 A1 WO2010067558 A1 WO 2010067558A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2834—Automated test systems [ATE]; using microprocessors or computers
Definitions
- the present invention relates to a test apparatus and a test method.
- this application is a continuation of US application 12/329635 (filing date: December 8, 2008).
- a device that performs packet communication is known.
- a test apparatus for testing a device that performs packet communication is also known.
- Each packet exchanged between devices in packet communication includes redundant data such as a start code, an end code, and a check code in addition to the actual data. Therefore, when testing a device that performs packet communication, the test apparatus has to generate a complicated test pattern including such redundant data.
- a device that performs packet communication performs a handshake with a communication partner device.
- a device that performs packet communication performs communication request / rejection exchange, communication start / end response exchange, communication success / failure exchange, and the like with a communication partner device.
- test apparatus when testing a device that performs packet communication, the test apparatus must perform a handshake with the device under test. The test apparatus must also prepare for the next transmission and transmit an idle packet or the like so that a response can be made immediately while waiting for a response from the device under test during the handshake. Therefore, when testing such a device, the test apparatus had to generate a complicated test pattern.
- an object of one aspect of the technical innovation (innovation) included in the present specification is to provide a test apparatus and a test method capable of solving 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.
- an example (exemplary) ⁇ ⁇ is a test apparatus for testing a device under test, and executes a test program for testing the device under test
- a host sequencer for sequentially designating each packet communicated with the device under test
- a packet data string storage unit for storing a data string included in each of a plurality of types of packets
- the packet data string storage unit And a lower sequencer that reads a data sequence of a packet designated by the upper sequencer and generates a test data sequence used for a test with the device under test.
- a test method for testing a device under test using a test apparatus includes: a host sequencer; A sequencer, and by executing a test program for testing the device under test by the host sequencer, sequentially specifying each packet to be communicated with the device under test, and a plurality of types by the lower sequencer
- the data sequence of the packet designated by the upper sequencer is read from the packet data sequence storage unit that stores the data sequence included in each of the packets, and the test data sequence used for the test with the device under test is generated
- a test method is provided.
- FIG. 1 shows a configuration of a test apparatus 10 according to this embodiment together with a device under test 200.
- FIG. 2 shows the configuration of the transmission side block 12.
- FIG. 3 shows an example of the configuration of the data processing unit 32 in the transmission side block 12.
- FIG. 4 shows an example of the configuration of the transmission unit 34 in the transmission side block 12.
- FIG. 5 shows the configuration of the receiving side block 14.
- FIG. 6 shows an example of the configuration of the data processing unit 32 in the receiving side block 14.
- FIG. 7 shows an example of the configuration of the receiving unit 82 included in the receiving side block 14.
- FIG. 8 shows the data structure of a procedure, a packet sequence, and a packet.
- FIG. 9 shows an example of a test program representing a packet sequence.
- FIG. 10 shows an example of an instruction sequence for generating an idle packet and a data sequence included in the idle packet.
- FIG. 11 shows an example of an instruction sequence for generating a write packet and a data sequence included in the write packet.
- FIG. 12 shows an example of processing timing by the upper sequencer 22 and the lower sequencer 28.
- FIG. 13 shows a processing flow of the test apparatus 10.
- FIG. 1 shows the configuration of a test apparatus 10 according to the present embodiment, together with a device under test 200.
- the test apparatus 10 tests a packet communication type device under test 200 that transmits and receives packets.
- the test apparatus 10 includes a transmission side block 12, a reception side block 14, a main memory 16, and a main control unit 18.
- the transmission side block 12 transmits packets to the device under test 200 in the order specified by the test program.
- the receiving block 14 receives a packet from the device under test 200 and determines whether the communication with the device under test 200 is good or bad.
- the main memory 16 stores a test program for testing the device under test 200. More specifically, the main memory 16 stores a test program representing a packet sequence representing the order of packets to be transmitted to and received from the device under test 200. Further, the main memory 16 stores individual data that is included in a packet to be transmitted or received and is individually determined for each packet.
- the main control unit 18 transfers the test program and individual data stored in the main memory 16 to the transmission side block 12 and the reception side block 14. Further, the main control unit 18 performs overall control such as start and end of the test apparatus 10.
- FIG. 2 shows the configuration of the transmission side block 12.
- the transmission side block 12 includes a sequence storage unit 20, a higher sequencer 22, a packet instruction sequence storage unit 24, a packet data sequence storage unit 26, a lower sequencer 28, a data processing unit 32, and a transmission unit 34. .
- the sequence storage unit 20 stores a test program representing a packet sequence.
- the test program is transferred from the main memory 16 to the sequence storage unit 20 prior to or during the test as appropriate.
- the host sequencer 22 executes the test program stored in the sequence storage unit 20 and sequentially designates each packet to be communicated with the device under test 200.
- the upper sequencer 22 uses, as an example, the address of an instruction sequence for generating the packet in the packet instruction sequence storage unit 24 (for example, the start address of the instruction sequence) for a packet communicated with the device under test 200. specify.
- the upper sequencer 22 specifies the address of the data string included in the packet in the packet data string storage unit 26 (for example, the start address of the data string) for the packet communicated with the device under test 200. To do.
- the upper sequencer 22 individually designates the address of the instruction sequence for generating the packet and the address of the data sequence included in the packet. In this case, when a common instruction sequence or data sequence is specified for two or more packets in the test program, the upper sequencer 22 addresses the same instruction sequence for the two or more packets. Or you may designate the address of the same data string.
- the packet instruction sequence storage unit 24 stores an instruction sequence for generating each of a plurality of types of packets for each type of packet. For example, the packet instruction sequence storage unit 24 stores an instruction sequence for generating a write packet, an instruction sequence for generating a read packet, an instruction sequence for generating an idle packet, and the like.
- the packet data string storage unit 26 stores a data string included in each of a plurality of types of packets for each type of packet.
- the packet data string storage unit 26 may store a data string included in the write packet, a data string included in the read packet, a data string included in the idle packet, and the like.
- the packet data string storage unit 26 includes a common data storage unit 40, a common data pointer 42, a first individual data storage unit 44-1, a second individual data storage unit 44-2, The individual data pointer 46-1 and the second individual data pointer 46-2 may be included.
- the common data storage unit 40 stores common data common to each type of packet in a data string included in each of a plurality of types of packets.
- the common data storage unit 40 stores, for each packet type, a start code indicating the start of the packet, an end code indicating the end of the packet, a command code for identifying the type of the packet, and the like.
- the common data pointer 42 acquires from the upper sequencer 22 the head address of the block in which the common data included in the packet designated by the upper sequencer 22 is stored. Further, the common data pointer 42 acquires the offset position in the block from the lower sequencer 28. Then, the common data pointer 42 gives an address (for example, an address obtained by adding the offset position to the head address) determined based on the head address and the offset position to the common data storage unit 40, and the common data stored in the address is subjected to data processing. To the unit 32.
- the first and second individual data storage units 44-1 and 44-2 store individual data to be changed for each packet in a data string included in each of a plurality of types of packets.
- each of the first and second individual data storage units 44-1 and 44-2 transmits the entity data transmitted to the device under test 200 or the entity data received from the device under test 200 included in each packet. You may remember.
- the first individual data storage unit 44-1 stores predetermined individual data regardless of the test program to be executed.
- the second individual data storage unit 44-2 stores individual data that is changed for each test program to be executed.
- the second individual data storage unit 44-2 receives transfer of individual data from the main memory 16 prior to or during the test.
- the first and second individual data pointers 46-1 and 46-2 receive from the upper sequencer 22 the head address of the block in which the individual data included in the packet designated by the upper sequencer 22 is stored. Further, the first and second individual data pointers 46-1 and 46-2 obtain the offset position in the block from the lower sequencer 28. The first and second individual data pointers 46-1 and 46-2 specify addresses determined based on the head address and the offset position (for example, an address obtained by adding the offset position to the head address) as the first and second individual data pointers. The data is supplied to the storage units 44-1 and 44-2, and the individual data stored at the address is supplied to the data processing unit 32.
- the lower sequencer 28 reads the instruction sequence of the packet designated by the upper sequencer 22, that is, the instruction sequence designated by the upper sequencer 22 from the packet instruction sequence storage unit 24, and each instruction included in the read instruction sequence Are executed sequentially. Further, the lower sequencer 28 sequentially reads the data sequence of the packet designated by the upper sequencer 22, that is, the data sequence designated by the upper sequencer 22 from the packet data sequence storage unit 26 in accordance with the execution of the instruction sequence. Then, a test data string used for a test with the device under test 200 is generated.
- the lower sequencer 28 sets an offset position indicating the position of data corresponding to the executed instruction in the block in which the data string included in the packet designated by the upper sequencer 22 is stored, the common data pointer 42, and the individual sequencer.
- the data is supplied to the data pointer 46-1 and the individual data pointer 46-2.
- the lower sequencer 28 may generate an initial value in the first instruction and generate a count value that is incremented every time the instruction to be executed transits as an offset position.
- the instruction sequence executed by the lower sequencer 28 preferably does not include a forward jump instruction, a branch instruction, or the like. As a result, the lower sequencer 28 can realize high-speed processing with a simple configuration.
- the lower sequencer 28 gives the data processing unit 32 control data instructing to perform the designated processing (calculation or data conversion) on the read individual data and common data every time the instruction is executed. As a result, the lower sequencer 28 can set the designated data portion in the packet designated by the upper sequencer 22 to data obtained by performing a designated process on the read data.
- the lower sequencer 28 performs common data, individual data (predetermined individual data regardless of a test program to be executed or individual data changed for each test program to be executed), and
- the data processing unit 32 designates which of the processed data is output to the data processing unit 32.
- the lower sequencer 28 designates the common data storage unit 40, the first individual data storage unit 44-1, the second individual data storage unit 44-2, or the designation in the data processing unit 32 every time an instruction is executed.
- the data processing unit 32 is designated to read out and output data from any of the registers storing the processed data.
- the lower sequencer 28 can generate a data portion to be changed for each packet in the packet designated by the upper sequencer 22 from the individual data read from the individual data storage unit 44. Further, the lower sequencer 28 can generate a data portion common to each packet type in the packet designated by the upper sequencer 22 from the common data read from the common data storage unit 40. Furthermore, the lower sequencer 28 can set the designated data portion in the packet designated by the upper sequencer 22 to data obtained by performing a designated process on the read data.
- the lower sequencer 28 may give an end notification to the upper sequencer 22 in response to completion of execution of the instruction sequence of the packet designated by the upper sequencer 22.
- the upper sequencer 22 can sequentially specify packets in accordance with the progress of execution of the instruction sequence by the lower sequencer 28.
- the lower sequencer 28 designates the edge timing of the signal to be transmitted to the device under test 200 to the transmission unit 34. For example, the lower sequencer 28 gives a timing signal to the transmission unit 34 to control the edge timing for each packet.
- the lower sequencer 28 communicates with the lower sequencer 28 on the reception side included in the reception side block 14 shown in FIG. 5 described later.
- the transmission-side lower sequencer 28 included in the transmission-side block 12 performs a handshake with the reception-side lower sequencer 28 included in the reception-side block 14 and executes the instruction sequence in synchronization with the reception-side lower sequencer 28. can do.
- the lower sequencer 28 on the transmission side notifies the lower sequencer 28 on the reception side that a test data sequence of a packet designated in advance has been transmitted to the device under test 200.
- the transmission-side lower sequencer 28 determines whether the data sequence received by the reception unit 82 by the determination unit 84 until the reception-side lower sequencer 28 receives a notification from the transmission-side lower sequencer 28. It can be prohibited.
- the transmission-side lower sequencer 28 receives a notification from the reception-side lower sequencer 28 that a data sequence that matches the generated test data sequence has been received, and the test data sequence of a packet designated in advance. Is generated.
- the lower sequencer 28 on the transmission side can transmit a predetermined packet to the device under test 200 after receiving a predetermined packet from the device under test 200.
- the data processing unit 32 inputs data from the common data storage unit 40, the first individual data storage unit 44-1 and the second individual data storage unit 44-2, and applies the lower sequencer 28 to the input data.
- the process specified by is output as each data of the test data string.
- the data processing unit 32 may output the input data as it is as the data of the test data string depending on the content specified by the lower sequencer 28.
- the transmission unit 34 transmits the test data string output from the data processing unit 32 to the device under test 200.
- An example of the configuration of the transmission unit 34 will be described with reference to FIG.
- FIG. 3 shows an example of the configuration of the data processing unit 32 in the transmission side block 12.
- the data processing unit 32 in the transmission side block 12 includes at least one register 52, a previous stage selection unit 54, at least one computing unit 56, a conversion unit 58, and a subsequent stage selection unit 60.
- Each of the at least one register 52 stores the operation processing result of the previous cycle.
- the data processing unit 32 includes a first register 52-1 and a second register 52-2.
- the pre-stage selection unit 54 For each cycle, the pre-stage selection unit 54 stores the common data from the common data storage unit 40, the individual data storage units 44 (in this example, the first individual data storage unit 44-1 and the second individual data storage unit). 44-2), the data of the respective registers 52 (in this example, the first register 52-1 and the second register 52-2) and the data output from the conversion unit 58, the lower sequencer 28 Select the specified data. Then, the pre-stage selection unit 54 sets each of the selected data for each cycle by the arithmetic unit 56 (in this example, the first arithmetic unit 56-1 and the second arithmetic unit 56 designated by the lower sequencer 28). -2), supplied to the conversion unit 58 or the subsequent stage selection unit 60.
- the arithmetic unit 56 in this example, the first arithmetic unit 56-1 and the second arithmetic unit 56 designated by the lower sequencer 28.
- Each of the at least one computing unit 56 is provided corresponding to each of the at least one register 52.
- the data processing unit 32 includes a first arithmetic unit 56-1 corresponding to the first register 52-1, and a second arithmetic unit 56-2 corresponding to the second register 52-2. including.
- each of the arithmetic units 56 performs operations such as logical operations, four arithmetic operations, pseudorandom number generation, and error correction code generation.
- Each of the computing units 56 performs an operation designated by the lower sequencer 28 on the data selected by the previous stage selection unit 54 and stores it in the corresponding register 52 for each cycle.
- the conversion unit 58 converts the data selected by the previous stage selection unit 54 with a table set in advance for each cycle. As an example, the conversion unit 58 performs data conversion such as 8b-10b conversion. Then, the conversion unit 58 outputs the converted data.
- the post-selection unit 60 selects the data selected by the pre-selection unit 54 for each cycle (in this example, the common data storage unit 40, the first individual data storage unit 44-1 or the second individual data storage unit 44- 2), data in at least one register 52, and data output from the converter 58, data corresponding to the designated packet is selected. Then, the subsequent stage selection unit 60 outputs the selected data as each data of the test data string.
- FIG. 4 shows an example of the configuration of the transmission unit 34 in the transmission side block 12.
- the transmission unit 34 includes a serializer 72, a format controller 74, and a driver 76.
- the serializer 72 converts the test data string received from the data processing unit 32 into a serial waveform pattern.
- the format controller 74 generates a signal having a waveform corresponding to the waveform pattern received from the serializer 72. Further, the format controller 74 outputs a signal having a waveform whose logic changes at the edge timing specified by the lower sequencer 28.
- the driver 76 supplies the signal output from the format controller 74 to the device under test 200.
- FIG. 5 shows the configuration of the receiving side block 14.
- the reception side block 14 has substantially the same configuration and function as the transmission side block 12 shown in FIG.
- members of the receiving block 14 members having substantially the same configurations and functions as those of the transmitting block 12 are denoted by the same reference numerals, and description thereof is omitted except for differences.
- the reception side block 14 includes a sequence storage unit 20, a higher sequencer 22, a packet instruction sequence storage unit 24, a packet data sequence storage unit 26, a lower sequencer 28, a data processing unit 32, a reception unit 82, a determination Part 84.
- the receiving unit 82 receives a packet data string from the device under test 200. An example of the configuration of the receiving unit 82 will be described with reference to FIG.
- the data processing unit 32 in the receiving side block 14 inputs the data string received by the receiving unit 82 and outputs the input data string together with the generated test data string.
- An example of the configuration of the data processing unit 32 will be described with reference to FIG.
- the lower sequencer 28 in the receiving block 14 outputs a data string expected to be output from the device under test 200 as a test data string. Further, the lower sequencer 28 in the receiving side block 14 designates the strobe timing for capturing the data value of the signal output from the device under test 200 to the receiving unit 82.
- the determination unit 84 receives the test data sequence and the data sequence received by the receiving unit 82 from the data processing unit 32.
- the determining unit 84 determines the quality of communication with the device under test 200 based on the result of comparing the data sequence received by the receiving unit 82 with the test data sequence.
- the determination unit 84 includes a logical comparison unit that compares whether the data sequence received by the reception unit 82 matches the test data sequence, and a fail memory that stores the comparison result.
- the lower sequencer 28 in the reception side block 14 communicates with the lower sequencer 28 on the transmission side included in the transmission side block 12 shown in FIG.
- the receiving side lower sequencer 28 included in the receiving side block 14 performs a handshake with the transmitting side lower sequencer 28 included in the transmitting side block 12, and executes the instruction sequence in synchronization with the transmitting side lower sequencer 28. can do.
- the reception-side lower sequencer 28 notifies the transmission-side lower sequencer 28 that a data sequence that matches the test data sequence generated by the reception-side lower sequencer 28 has been received.
- the low-order sequencer 28 on the transmission side receives a notification from the low-order sequencer 28 on the reception side that it has received a data sequence that matches the generated test data sequence, and generates a test data sequence for a packet designated in advance. can do.
- the reception-side lower sequencer 28 determines that the determination unit 84 until receiving a notification from the transmission-side lower sequencer 28 that a test data string of a packet designated in advance has been transmitted to the device under test 200. The determination of pass / fail of the data string received by the receiving unit 82 is prohibited. Thereby, the lower sequencer 28 on the receiving side can determine whether or not a response according to the predetermined packet is output from the device under test 200 after transmitting the predetermined packet to the device under test 200.
- FIG. 6 shows an example of the configuration of the data processing unit 32 in the receiving side block 14.
- the data processing unit 32 in the reception side block 14 has substantially the same configuration and function as the data processing unit 32 in the transmission side block 12 shown in FIG.
- the members included in the data processing unit 32 in the receiving side block 14 the members having substantially the same configuration and function as the members included in the data processing unit 32 in the transmitting side block 12 are denoted by the same reference numerals and are different. Description is omitted except for this.
- the upstream selection unit 54 in the reception side block 14 further supplies the data received by the reception unit 82 to the downstream selection unit 60 for each cycle. Further, the post-stage selection unit 60 in the reception side block 14 further outputs the data received by the reception unit 82 supplied from the pre-stage selection unit 54 together with the data of the test data sequence for each cycle. Thereby, the data processing unit 32 in the receiving side block 14 can input the data string received by the receiving unit 82 and output the input data string together with the generated test data string.
- FIG. 7 shows an example of the configuration of the receiving unit 82 included in the receiving side block 14.
- the receiving unit 82 includes a level comparator 86, a timing comparator 88, a deserializer 90, and a phase adjusting unit 92.
- the level comparator 86 compares the signal output from the device under test 200 with a threshold value and outputs a logic signal.
- the timing comparator 88 sequentially takes in the logic signal data output by the level comparator 86 at the strobe timing specified by the lower sequencer 28.
- the deserializer 90 converts the data sequence captured by the timing comparator 88 into a parallel test data sequence.
- the phase adjustment unit 92 detects the specific code at the head of the packet, and adjusts the parallel test data cut-out phase by the deserializer 90.
- FIG. 8 shows the data structure of the procedure, packet sequence, and packet.
- the test apparatus 10 executes a test program including one or more continuous procedures. Each procedure defines a sequence of packets to be transmitted to the device under test 200 or a sequence of packets expected to be received from the device under test 200.
- the host sequencer 22 executes such a test program and sequentially designates a packet to be transmitted to the device under test 200 and a packet to be received from the device under test 200. Then, the lower sequencer 28 sequentially receives packet designations from the upper sequencer 22, executes an instruction sequence for generating the designated packet, and generates a data sequence included in the packet.
- Each packet includes, for example, a start code and an end code. Further, each packet includes a command representing the type of the packet. Such start code, end code, and command are common data common to each type of packet. Therefore, the lower sequencer 28 reads out and generates such common data from the address specified by the upper sequencer 22 in the common data storage unit 40 in which the common data is stored.
- Each packet includes actual data such as an address for specifying the storage location of the device under test 200, write data to the device under test 200, and read data from the device under test 200.
- entity data is individual data that is changed for each packet. Accordingly, the lower sequencer 28 reads out and generates such individual data from the address specified by the upper sequencer 22 in the individual data storage unit 44 in which the individual data is stored.
- Each packet includes a check code for detecting an error in data included in the packet.
- a check code or the like is calculated by performing an operation on each data included in the packet. Accordingly, the lower sequencer 28 generates such a check code by causing the calculator 56 in the data processing unit 32 to calculate.
- Each packet may include data converted according to a predetermined rule such as 8b-10b conversion. In this case, the lower sequencer 28 further converts each of the generated data by the conversion unit 58 and outputs the converted data.
- FIG. 9 shows an example of a test program representing a packet sequence.
- the upper sequencer 22 has a plurality of instructions sequentially executed as shown in FIG. 9, a packet type and a parameter described corresponding to each of the plurality of instructions, and a corresponding type of packet.
- the test program in which the instruction sequence for generating the address and the address indicating the storage position of the data sequence are described is executed.
- the test program includes, as an example, a NOP instruction, an IDXI instruction, an EXIT instruction, and the like.
- the NOP instruction generates a packet associated with the NOP instruction once, and transitions execution to the next instruction.
- the IDXI instruction repeatedly generates a packet associated with the IDIX instruction a specified number of times, and transitions execution to the next instruction.
- the EXIT instruction generates a packet associated with the EXIT instruction once, and ends the execution of the packet sequence.
- the test program can include not only such instructions, but may include, for example, a branch instruction that branches the next instruction to be executed depending on whether or not a specified condition is met.
- test program describes, for example, a write packet, a read packet, and a packet type for identifying an idle packet generated by repeating a predetermined code.
- test program includes, as an example, a start address in which an instruction sequence for generating the packet is stored, a start address of common data included in the packet, and a start address of individual data included in the packet.
- FIG. 10 shows an example of a command sequence for generating an idle packet and a data sequence included in the idle packet.
- FIG. 11 shows an example of an instruction sequence for generating a write packet and a data sequence included in the write packet.
- the lower sequencer 28 as shown in FIG. 10 and FIG. 11, a plurality of instructions executed sequentially, control data corresponding to each of the plurality of instructions, and output corresponding to each of the plurality of instructions.
- An instruction sequence including information specifying a storage location of data to be executed is executed.
- the instruction sequence designates, for example, the common data storage unit 40, the individual data storage unit 44, the register 52, or the conversion unit 58 as a data storage location.
- a hexadecimal value such as 0x0F or 0x01 specifies the common data storage unit 40 as a data storage location.
- the DB 1 designates the first individual data storage unit 44-1 as a data storage location.
- the DB 2 designates the second individual data storage unit 44-2 as a data storage location.
- REG1 designates the first register 52-1 as a data storage location.
- the instruction sequence includes a NOP instruction, an IDXI instruction, an RTN instruction, and the like.
- the NOP instruction outputs once the data stored at the address specified by the pointer in the storage location associated with the NOP instruction, and shifts execution to the next instruction.
- the IDXI instruction repeatedly outputs the data stored at the address specified by the pointer at the storage location associated with the IDIX instruction for the specified number of times, and transitions execution to the next instruction.
- the RTN instruction outputs once the data stored at the address specified by the pointer in the storage location associated with the RTN instruction, and returns execution to the upper sequencer 22.
- the instruction sequence executed by the lower sequencer 28 preferably does not include a forward jump instruction, a branch instruction, or the like. As a result, the lower sequencer 28 can realize high-speed processing with a simple configuration.
- the instruction sequence includes an arithmetic expression given to the arithmetic unit 56 as control data.
- ⁇ DB1 or REG1 REG1 ⁇ DB2).
- the instruction sequence may specify the conversion process by the conversion unit 58 as control data.
- FIG. 12 shows an example of processing timing by the upper sequencer 22 and the lower sequencer 28.
- the host sequencer 22 starts executing the packet sequence in response to receiving a start signal from the main control unit 18.
- the upper sequencer 22 designates the packets in the order corresponding to the packet sequence.
- the lower sequencer 28 executes an instruction sequence for generating the packet in response to the designation of the packet from the upper sequencer 22.
- the upper sequencer 22 may specify the next packet to the lower sequencer 28 during execution of an instruction sequence of a packet by the lower sequencer 28 (that is, before completion of the instruction sequence).
- the lower sequencer 28 can start executing the instruction sequence of the next packet immediately after executing the last instruction (RTN instruction) of a packet (for example, in the next cycle).
- FIG. 13 shows a processing flow of the test apparatus 10.
- the host sequencer 22 executes a test program and sequentially designates each packet to be communicated with the device under test 200 (S11, S16).
- the lower sequencer 28 receives the packet designation from the upper sequencer 22, the lower sequencer 28 repeatedly executes the processing from step S12 to step S15.
- the lower sequencer 28 When the lower sequencer 28 receives the designation of the packet, the lower sequencer 28 calls the instruction sequence for generating the packet from the packet instruction sequence storage unit 24 and sequentially executes the instruction from the head instruction. The lower sequencer 28 performs steps S13 and S14 every time each instruction is executed (S12, S15).
- step S13 the lower sequencer 28 outputs data corresponding to the instruction. Further, in step S14, the lower sequencer 28 executes an operation or data conversion corresponding to the instruction. The lower sequencer 28 executes step S13 and step S14 in parallel.
- the lower sequencer 28 executes the last instruction, the lower sequencer 28 returns the processing to the upper sequencer 22 and receives the designation of the next packet from the upper sequencer 22 (S15). Then, when the processing up to the last packet in the packet sequence is completed, the upper sequencer 22 ends the flow (S16).
- the test program representing the packet sequence and the instruction sequence in the packet are executed by separate sequencers.
- description of a program can be simplified.
- the instruction sequence and data for generating a common type of packet can be shared, the amount of information to be stored can be reduced.
- test apparatus 10 individually designates the address of the instruction sequence executed by the lower sequencer 28 and the address of the data sequence read by the lower sequencer 28 from the upper sequencer 22. Thereby, according to the test apparatus 10, different data sequences can be generated by the same command sequence. Therefore, according to the test apparatus 10, since it is not necessary to store a plurality of identical instruction sequences, the amount of information to be stored can be reduced.
- the data processing unit 32 executes a specified process (that is, calculation or conversion) on the data read from the common data storage unit 40 and the individual data storage unit 44. . That is, the data processing unit 32 can generate data conversion and error detection codes to be processed in accordance with the definition of the lower layer (layer close to the physical layer) in packet communication.
- the test apparatus 10 it is only necessary to generate an instruction sequence and a data sequence for outputting upper layer data in packet communication and separately specify processing in the lower layer in packet communication. The description can be simplified and the amount of information to be stored can be reduced.
- the test apparatus 10 includes a transmission side block 12 that generates a test data sequence for transmitting a signal to the device under test 200, and test data for comparison with a signal received from the device under test 200.
- the receiving side block 14 that generates a column is separated from each other, and each has a higher sequencer 22 and a lower sequencer 28.
- the test apparatus 10 can communicate between the lower sequencer 28 on the transmission side and the lower sequencer 28 on the reception side. Thereby, according to the test apparatus 10, for example, it is easy to start an operation on the reception side using an event generated on the transmission side as a trigger, or to start an operation on the transmission side using an event generated on the reception side as a trigger. It becomes.
- test apparatus 10 may be configured to include a plurality of sets of the transmission side block 12 and the reception side block 14.
- the main control unit 18 gives a separate sequence (separate test program) to each of the set of the transmission side block 12 and the reception side block 14 and causes them to be executed independently of each other.
- the test apparatus 10 can operate each of the set of the transmission side block 12 and the reception side block 14 asynchronously with each other.
- the main control unit 18 may operate each set of the transmission side block 12 and the reception side block 14 in synchronization with each other. In this case, the main control unit 18 gives the same sequence (the same test program) to each of the set of the transmission side block 12 and the reception side block 14 and starts execution in synchronization with each other.
- the test apparatus 10 can test a plurality of devices under test 200 having the same type or different types of packet communication type interfaces in parallel.
- Test apparatus 12 Transmission side block 14 Reception side block 16 Main memory 18 Main control part 20 Sequence memory
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Abstract
Description
12 送信側ブロック
14 受信側ブロック
16 メインメモリ
18 メイン制御部
20 シーケンス記憶部
22 上位シーケンサ
24 パケット命令列記憶部
28 下位シーケンサ
26 パケットデータ列記憶部
32 データ処理部
34 送信部
40 共通データ記憶部
42 共通データポインタ
44 個別データ記憶部
46 個別データポインタ
52 レジスタ
54 前段選択部
56 演算器
58 変換部
60 後段選択部
72 シリアライザ
74 フォーマットコントローラ
76 ドライバ
82 受信部
84 判定部
86 レベルコンパレータ
88 タイミングコンパレータ
90 デシリアライザ
92 位相調整部
200 被試験デバイス
Claims (13)
- 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を試験するための試験プログラムを実行して、前記被試験デバイスとの間で通信する各パケットを順次指定する上位シーケンサと、
複数種類のパケットのそれぞれに含まれるデータ列を記憶するパケットデータ列記憶部と、
前記パケットデータ列記憶部から、前記上位シーケンサにより指定されたパケットのデータ列を読み出して、前記被試験デバイスとの間の試験に用いる試験データ列を生成する下位シーケンサと、
を備える試験装置。 - 前記試験データ列を、前記被試験デバイスに対して送信する送信部を更に備える請求項1に記載の試験装置。
- 前記被試験デバイスからパケットのデータ列を受信する受信部と、
前記受信部が受信したデータ列を前記試験データ列と比較した結果に基づいて、前記被試験デバイスとの間の通信の良否を判定する判定部と、
を更に備える請求項1に記載の試験装置。 - 複数種類のパケットのそれぞれを発生するための命令列を記憶するパケット命令列記憶部を更に備え、
前記上位シーケンサは、前記被試験デバイスとの間で通信するパケットについて、前記パケット命令列記憶部内における命令列のアドレスおよび前記パケットデータ列記憶部内におけるデータ列のアドレスを指定し、
前記下位シーケンサは、前記上位シーケンサによりアドレスが指定された命令列およびデータ列を読み出して、前記試験データ列を生成する
請求項1に記載の試験装置。 - 前記試験プログラム中において、2以上のパケットに対して共通する命令列またはデータ列が指定されている場合に、前記上位シーケンサは、当該2以上のパケットについて同一の命令列のアドレスまたは同一のデータ列のアドレスを指定する請求項4に記載の試験装置。
- 前記被試験デバイスに対する送信側の前記上位シーケンサ、前記パケットデータ列記憶部、および前記下位シーケンサと、
送信側の前記下位シーケンサが発生した前記試験データ列を、前記被試験デバイスに対して送信する送信部と、
前記被試験デバイスからの受信側の前記上位シーケンサ、前記パケットデータ列記憶部、および前記下位シーケンサと、
前記被試験デバイスからパケットのデータ列を受信する受信部と、
を備える請求項1に記載の試験装置。 - 前記受信側の下位シーケンサは、前記受信側の下位シーケンサが生成した試験データ列と一致するデータ列を受信したことを前記送信側の下位シーケンサに通知し、
前記送信側の下位シーケンサは、前記受信側の下位シーケンサからの通知を受けて、予め指定されたパケットの前記試験データ列を生成する
請求項6に記載の試験装置。 - 前記受信部が受信したデータ列を前記試験データ列と比較した結果に基づいて前記被試験デバイスとの間の通信の良否を判定する判定部を更に備え、
前記送信側の下位シーケンサは、予め指定されたパケットの前記試験データ列を前記被試験デバイスに送信したことを前記受信側の下位シーケンサに通知し、
前記受信側の下位シーケンサは、前記送信側の下位シーケンサからの通知を受けるまでの間、前記判定部による前記受信部が受信したデータ列の良否判定を禁止する
請求項6に記載の試験装置。 - 前記パケットデータ列記憶部は、
複数種類のパケットのそれぞれに含まれるデータ列中における、パケット毎に変更する個別データを記憶する個別データ記憶部と、
複数種類のパケットのそれぞれに含まれるデータ列中における、パケットの種類毎に共通の共通データを記憶する共通データ記憶部と、
を有し、
前記下位シーケンサは、前記上位シーケンサにより指定されたパケット中における、パケット毎に変更すべきデータ部分を前記個別データ記憶部から読み出した個別データから生成し、パケットの種類毎に共通するデータ部分を前記共通データ記憶部から読み出した共通データから生成する
請求項1に記載の試験装置。 - 前記個別データ記憶部および前記共通データ記憶部からのデータを入力して、入力したデータに対して前記下位シーケンサにより指定された処理をして前記試験データ列の各データとして出力するデータ処理部を更に備える請求項9に記載の試験装置。
- 前記データ処理部は、
前サイクルの演算処理結果を記憶するレジスタと、
前記個別データ記憶部からの個別データ、前記共通データ記憶部からの共通データ、および前記レジスタのデータから、指定されたデータを選択する前段選択部と、
選択されたデータに対して、前記下位シーケンサにより指定された演算をして前記レジスタに格納する演算器と、
前記前段選択部が選択したデータおよび前記レジスタ内のデータから、前記下位シーケンサにより指定されたデータを選択して前記試験データ列のデータとして出力する後段選択部と、
を有する請求項10に記載の試験装置。 - 前記データ処理部は、前記前段選択部が選択したデータを予め設定されたテーブルにより変換する変換部を更に有し、
前記後段選択部は、前記前段選択部が選択したデータ、前記レジスタ内のデータ、および前記変換部が出力するデータから、指定されたパケットに応じたデータを選択して前記試験データ列の各データとして出力する
請求項11に記載の試験装置。 - 試験装置により被試験デバイスを試験する試験方法であって、
前記試験装置は、上位シーケンサと、下位シーケンサとを備え、
前記上位シーケンサにより、前記被試験デバイスを試験するための試験プログラムを実行して、前記被試験デバイスとの間で通信する各パケットを順次指定し、
前記下位シーケンサにより、複数種類のパケットのそれぞれに含まれるデータ列を記憶するパケットデータ列記憶部から、前記上位シーケンサにより指定されたパケットのデータ列を読み出して、前記被試験デバイスとの間の試験に用いる試験データ列を生成する
試験方法。
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