| 摘要 |
a) Memory access control system. b) A memory access control system includes a set of addresses 9-10 which exhibits a bit representing the validity of contents of a pre-memory 18 and a bit representing a coincidence between the contents of the pre-memory 18 and the contents of the main memory unit 23, a circuit 13 making a hit/miss judgment in order to give judgment on a hit/miss of the pre-memory 18, a circuit 14 for determining the level to be replaced in order to determine a level to be replaced of the pre-memory 18 when a miss by the pre-memory occurs, a judgment circuit 16 concerning the replacement in order to detect the validity of the data of the block at the level to be replaced and to detect a non-coincidence between the contents of the pre-memory 18 and the main memory unit 23 and to judge the necessity for writing the data from the pre-memory block 18 into the main memory unit 23. c) In a pre-memory system, the invention makes it possible to process the read and write operations with a single request. <IMAGE>
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