| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that data in a cache memory can not be completely protected from replacement in a conventional cache memory replacement system. SOLUTION: Each memory of a tag memory is provided with a replacement protection bit L(replacement protection bit) indicating that it is a replacement protection status, and the address region of data to be protected from replacement is designated. When the data in the address region are written in a cache memory according to cache mistake, the replacement protection bit L of the write entry is set as a valid value. When a replacement object way is selected according to the cache mistake according to following access to any region other than the address region, the way of the entry whose replacement protection bit L is valid is prevented from being selected so that the data on the cache memory can be protected from being replaced. COPYRIGHT: (C)2006,JPO&NCIPI
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