| 摘要 |
PROBLEM TO BE SOLVED: To exert high communication performance corresponding to a high-speed data communication specification without imposing a burden onto software, and to reduce the whole power consumption in time of a low-speed transfer mode. SOLUTION: In a PC peripheral apparatus (printer) having respective receiving and transmitting FIFOs, when recognizing that transfer in a high-speed mode (HS mode) is performed by negotiation with a host, the transmitting FIFO is changed over to the receiving FIFO in time of reception transfer requirement. Thereby, even when internal processing of the printer does not catch up a transfer speed of 480 Mbps in time of data transfer from a host PC, reception processing can be performed without stopping the data transfer by using the other FIFO. COPYRIGHT: (C)2006,JPO&NCIPI
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