| 摘要 |
PURPOSE:To realize the miniaturization of the refresh control circuit by performing the refresh for the dynamic memory device via the microcomputer which operates in the reverse phase to the processor. CONSTITUTION:Microcomputer (micon) B monitors the time, and produces the refresh address at the fixed time to apply the start of the refresh in the form of the memory access to main memory device 1 consisting of the dynamic memory. In that case, micon A functioning as the processor operates in the opposite phase to micon B which gives the refresh. Thus micon A and B feature the different time for the memory cycle, thus eliminating occurrence of the access competition. Accordingly, no overhead of micon A due to the refresh occurs at all. Thus the start can be applied to device 1 from micon B with fixed interval and address sequence, thus securing execution of the memory refresh. |
