| 摘要 |
PROBLEM TO BE SOLVED: To provide a serial path tester which can monitor the transmission condition of a serial path for a long time with a simple configuration. SOLUTION: A physical layer circuit 5n of a serial path tester 2n, which receives packet transmission signals from other node devices through a high- speed serial path 1 of IEEE(Institute of Electrical and Electronics Engineers) 1394, outputs the received data along with control signals for handshake, and a data extraction circuit 27 connected to the physical layer circuit 5n extracts data of one byte configuring a packet and detects the byte location in the packet of the byte data. A CRC(circular redundancy check) error judgment circuit 28 judges presence/absence of a header CRC error and presence/absence of a data CRC error, according to the extracted byte data and byte location, and a header CRC error counter 29 measures the number of header CRC error occurrence, and a data CRC error counter 30 measures the number of data CRC error occurrence.
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