| 摘要 |
PURPOSE:To improve the data reliability of the computer system, which uses two layers of caches and employs a copy backup system for the secondary cache while holding the data consistency between the primary and secondary caches. CONSTITUTION:When data in the secondary cache are erased, the primary cache is informed of that and plural caches are prepared; if a data error is generated, the other cache is used. In the computer system which has the multi- layered cache memory constitution, no noncoincidence between the primary and secondary caches is entailed even if the primary cache memory has a set associative system which is less in the number of sets than that of the secondary cache memory. Namely, the coherence of data can be maintained. |
