| 摘要 |
PROBLEM TO BE SOLVED: To provide a USB test monitor circuit for monitoring interface signals between a physical layer transmitting/receiving differential signals flowing in a USB bus and a serial interface engine conducting communication of the physical layer, for identifying a transaction flowing in the USB bus, and for evaluating validity of a part independent of the physical layer without using an additional measurement apparatus. SOLUTION: The USB test monitor circuit is provided with a state machine 102 for identifying the transaction of the differential signals flowing in the USB bus based on a UTMI signal between a PHY transmitting/receiving the differential signals flowing in the USB bus and an SIE conducting communication of the PHY; a data generation part 101 for generating data signals flowing in the USB bus based on the UTMI signal; and a parallel control part 14 for outputting in parallel the transaction identification result identified in the state machine 102 and the data signal generated in the data generation part 101. COPYRIGHT: (C)2007,JPO&INPIT
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