| 摘要 |
IEEE 1394 bus interface circuit 15X comprises a physical layer LSI 37 connected to an IEEE 1394 bus 14, a data capture circuit 22X connected to the physical layer LSI 37 through signal lines to capture data on the signal lines for data analysis, and a coupler (a plug or a socket) 38 to be coupled to a coupler (a socket or a plug) 39 to which a physical layer LSI of an IEEE 1394 bus interface 10 is attached in actual use. With engaging the couplers 39 and 38 to each other, data transmitted between nodes 10 and 13 are captured by the data capture circuit 22X and analyzed in an IEEE 1394 bus analysis apparatus 16. In another IEEE 1394 bus interface circuit, a link power status signal provided to the physical layer circuit from the link layer circuit is fixedly set low, whereby the physical layer circuit is made to function as a repeater, and data received by the physical layer circuit are captured by the link layer circuit and analyzed in the IEEE 1394 bus analysis apparatus.
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