| 摘要 |
PROBLEM TO BE SOLVED: To execute data transfer control by using an FIFO having a data capacity which is smaller than the maximum transfer length of a packet at the time of transmitting/receiving continuous data such as a packet. SOLUTION: An FIFO 10 has a capacity which is smaller than the maximum transfer length of a packet. A transmission control circuit 11 is composed of a transmission writing pointer 11a and a transmission reading pointer 11c representing data write quantity and data reading quantity corresponding to FIFO blocks 10a and 10b and an FIFO block switching control part 11b for switching the FIFO blocks 10a and 10b according to storage data quantity represented by them. A transmission write control part 12 or a transmission reading control part 13 acquires data storage information from the transmission control circuit 11, and outputs a permission signal to a transmission transfer origin or transmission transfer destination when writing or reading is possible. Also, when reading is impossible, a transmission TERM control part outputs a transmission TERM signal to temporarily stop data transmission to the transmission transfer destination. COPYRIGHT: (C)2005,JPO&NCIPI
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