| 摘要 |
PROBLEM TO BE SOLVED: To reduce the read latency of cache data when a cache tag part and a cache data part are divided and managed in a cache type computer system. SOLUTION: In memory read processing, a coherent controller 20 before reading a cache tag out of a cache tag part 5 and making a cache hit check, issues a discarding read request to preread (discarding read) data from a cache data part 7, to a cache data controller 6. The cache data controller 6 holds discarding-read data from the cache data part 7 and sends the discarding-read data back as reply dada once receiving a read request issued by the coherent controller 20 at the time of a cache hit.
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