High integrity cache directory

Details High integrity cache directory High integrity cache directory

2005-05-24

2005-05-24

Beausoliel, Robert (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S005110, C714S049000, C714S054000

Reexamination Certificate

active

06898738

ABSTRACT:
Cache memory, and thus computer system, reliability is increased by duplicating cache tag entries. Each cache tag has a primary entry and a duplicate entry. Then, when cache tags are associatively searched, both the primary and the duplicate entry are compared to the search value. At the same time, they are also parity checked and compared against each other. If a match is made on either the primary entry or the duplicate entry, and that entry does not have a parity error, a cache “hit” is indicated. All single bit cache tag parity errors are detected and compensated for. Almost all multiple bit cache tag parity errors are detected.

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