| 摘要 |
PURPOSE:To enable dynamic constitution control by providing a selection cycle to every central processor and by attaining refreshment request access from each processor of a multi-processing system to a main memory device by turns. CONSTITUTION:System timing generator STG 27 of a multiprocessing system generates a basic refreshment request timer while considering a refreshment request interval. This basic refreshment request signal is time-divided by the number of processors of the multiprocessing system to give refreshment request selection cycles 25 and 26 to processor CPUs 20 and 21, which send evenly refreshment request signals 23 and 24 to main memory device MS22 by turns. Normally, when MS is used in common during the operation for refreshment, both CPUs send evenly refreshment requests to shared MS by turns at constant intervals according to the said selection cycles, thereby refreshing MS. |
