| 摘要 |
PURPOSE:To transfer data at a high speed in a swapping-out mode by holding the information on the propriety for swapping-out for each block of the lower storage and swapping out with priority the transfer of data from the upper storage. CONSTITUTION:The accesses are given to a valid bit 11 corresponding to a block entry 13 as well as to a C bit array 12 in response to the column address of a memory address 301. Then the information A0 and A1 on the propriety for swapping-out of blocks are produced on the outputs of AND circuits 302 and 303. These information are applied to a processing type deciding circuit consisting of AND circuits 304-309, an exclusive OR 310 and an OR circuit 311. Then the types I-IV of working orders of memory accesses are obtained on flip-flops 312-314. Thus a memory access order control part 316 starts both BS and MS access control circuits 316 and 317 by the prescribed times according to said types.
|
