| 摘要 |
PURPOSE:To eliminate the need for a memory end signal produced through the competition between the memory access and the refresh and to make high speed, by eliminating a racking circuit in a refresh control system of a dynamic type memory. CONSTITUTION:A memory controller performing refresh control receives an access request to a volatile memory 22, a microprogram control type processor 21 managing a memory refresh request and a clear signal incoming externally, this clear signal is synchronized with a refresh clock determining the refresh interval and supplied to the processor 21 at a refresh control section 24 mainly. A test microinstruction is set at the head of a microinstruction started with the clear signal and the execution of the microinstruction is blocked until the clear signal is released. |
