Cache memory and method for handling effects of external...

Details Cache memory and method for handling effects of external... Cache memory and method for handling effects of external...

2006-12-05

2006-12-05

Padmanabhan, Mano (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S003000, C711S118000, C711S119000, C711S122000, C711S140000, C711S146000

Reexamination Certificate

active

07146468

ABSTRACT:
A cache memory that completes an in-flight operation with another cache that collides with a snoop operation, rather than canceling the in-flight operation. Operations to the cache comprise a query pass and one or more finish passes. When the cache detects a snoop query intervening between the query pass and a finish pass of the in-flight operation, the cache generates a more up-to-date status for the snoop query that takes into account the tag status to which the in-flight finish pass will update the implicated cache line. This is necessary because otherwise the snoop query might not see the affect of the in-flight finish pass status update. This allows the in-flight finish pass to complete instead of being cancelled and the snoop finish pass to correctly update the status after the in-flight finish pass, and to provide modified data from the cache line to the externally snooped transaction.

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