| 摘要 |
PURPOSE:To 'unable' information indicating the data length in the transmitted data and to shorten the processing time necessary for the receiving control by providing a circuit which counts the data length of the receiving data in the receiving buffer control part of each node in the data transmitting system and a receiving data count register holding counted data length. CONSTITUTION:The data received through a receiving transmission line 20 from the other-side node are checked for their node addresses and mis- transmissions in a receiving transmission line access control part 22. When there is no mis-transmission, the said control part 22 writes the receiving data into a receiving buffer memory 23 to store, counts the data length of the receiving data, and holds the data length of the receiving data at a received data count register 24 at the time when the write-in of the data to the receiving buffer memory 23 is over. A receiving buffer control part 26 executes the receiving DMA-starting to a receiving DMA circuit 25, DMA-transfers the received data in the receiving buffer memory 23 to main memory 2B for the data length held in the receiving data count register 24 and generates an interruption, thereby completing the receiving action. |
