Predictive multistage comparison for associative memory

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United States of America Patent

PATENT NO 9916246
SERIAL NO

15238209

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Abstract

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A processing system includes a shadow tag memory, which stores a plurality of entries containing coherency information for the cachelines residing at the various levels of private caches. If a cache miss occurs at a private cache, or if coherency information for a cacheline requires updating, a probe is sent to the shadow tag memory maintained at the shared cache to determine whether the requested (or affected) cacheline is stored at another private cache. The probe includes a tag which can be divided into two or more portions. To more efficiently compare the probe tag to the shadow tag entries, the comparison is performed in multiple stages based on the portions of the probe tag.

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Patent Owner(s)

  • ADVANCED MICRO DEVICES, INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Busta, Eric Fort Collins, US 3 6
Ciraula, Michael K Fort Collins, US 18 160
Donley, Gregg Sunnyvale, US 4 1
Garg, Alok Boxborough, US 14 20
Henrion, Carson Donahue Fort Collins, US 4 14

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