| 摘要 |
PURPOSE:To attain direct access since no transfer of data is required between a main memory and a CPU memory and therefore to shorten the data transfer time in a multiprocessor system sharing a memory, by using a mapping register to perform the transfer of data between both CPU. CONSTITUTION:The address of a main memory of a processor system 7 is produced by a mapping register 74 and sent to an address bus 3. The data on said address is transferred to a data bus 4 via a signal transmission/reception unit 75. When data are transferred to a CPU 70 from a main CPU 1, the CPU 1 prepares the corresponding data on a main memory 5 and informs the relevant address to the CPU 70 at the transfer destination. Thus the CPU 70 sets a part of the address informed to the register 74 and then reads the buffer area on a memory 73. Thus a bus control circuit 6 acquires the bus of a main processor. Then it is possible for the main memory contents decided by the CPU 70 to give direct access to the value of the register 74. |
