CACHE MEMORY AND ITS CONTROLLING METHOD

摘要

A cache memory has a valid flag indicating whether a cache entry holding unit data on cache is valid or not correspondingly to the cache entry and a dirty flag indicating whether write for the cache entry is done or not. The cache memory comprises a flag altering section for setting a valid flag by creating the address of the cache entry as a tag without loading data from a memory according to the instruction from the processor or resetting the dirty flag while holding rewritten data not written back for the cache entry.