| 摘要 |
PURPOSE:To retransmit data with no reduction of the transmission speed by controlling the read-out of data out of a buffer memory for retransmission and the write of data to a data bus switching circuit and an I/O interface when an error is detected. CONSTITUTION:An I/O interface circuit 20 also performs addition of the redundant data on parities, CRC code, etc. A buffer memory 30 for retransmission preserves data sent to an I/O device for a period between the past and the present time points. A control circuit 40 controls totally a data retransmission processor and produces both read and write signals of data to the address signal of the memory 30. The circuit 40 also controls the I/O device. A date bus switching circuit 50 switches the data supplied to the circuit 20 between a normal action mode and a data retransmission mode. |
