| 摘要 |
PROBLEM TO BE SOLVED: To surely establish logical connection between devices intended by users, when utilizing a protocol where logical connection is made on a serial bus. SOLUTION: A PC and a peripheral unit, whose connection establishment is intended, are respectively connected to ports A, B of a connection control device 10. The peripheral unit connected to the port B and a PC, whose connection establishment is not intended, are connected to a port C. A physical layer LSI 50 is connected to the ports A, B, and a physical layer LSI 51 is connected to the port C respectively. Furthermore, an input terminal of a DC voltage conversion IC 80 is connected, so as to be energized from the port A. An output terminal of a timer IC 110 is connected to a reset terminal of the physical layer LSI 51. This physical layer LSI 51 is controlled by the timer IC the LSI 51 is in a reset state, until a prescribed time elapses after the application of power supply from the port A and is brought into a normal operating state, after the lapse of the prescribed time.
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