| 摘要 |
PURPOSE:To reduce the loading on a CPU during data transfer processing by installing additionally a device which transfers data not via CPU by giving prameters to the titled device such as transferer address, etc. of the data to be transfered. CONSTITUTION:A CPU 1 processes a program for transferring a main memory intra data, which sets parameters (data transferer address, transfer destination address, number of transfer words, etc.) for data transfer and requests data transfer for a main memory intra data transfer mechanism 6 on the basis of these parameters. The data transfer mechanism 6 sets the transferer address through the given parameters, reads the data for the number of transfer words, then, after setting the transfer destination address, writes the already-read data in a main memory device 2. Since the CPU 1 does not participate in transfer processing during transferring these data, it can carry out other processings. When the data transfer processing is completed, the data transfer mechanism 6 reports its termination to the CPU 1, and the CPU 1 terminates data transferring after received this report and returns to the initial state. |
