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キャッシュメモリシステム
A cache memory system capable of preventing unnecessary data transfer and rewriting data in a word unit is provided.
At the time of the mishit, the address entry of an address array corresponding to block data to be replaced and the data entries of the data arrays are retained effective until the block data corresponding to the read request reaches a cache memory system (1) from the memory (3).
A cache memory system (1) includes: a data array (103) including a plurality of blocks composed of a plurality of words; a storage means (106) for storing the address group of a main storage device (3) corresponding to a block having data in at least one word; a writing means (115) for, when the address from a device (2) is not found in the storage means (106) during the writing from the device (2), using any of the blocks as writing, associating any word thereof with the address, and writing the data from the device (2); a word state storage means (107) for storing word state information indicating the word having the data and the address corresponding to the word in association with each other; and a reading means (115) for, when the word state information corresponding to the address from the device (2) is found in the word state storage means (107) during the reading from the device (2), reading the data from the word indicated by the information.
With the configuration, even if there is the access from a CPU (2) to the block data to be replaced before the block data corresponding to the read request reaches the cache memory system (1) from the memory (3), the block data to be replaced can be treated as cache hit.
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