Applicant
Microsoft Technology Licensing, LLC
Grantee
MICROSOFT TECHNOLOGY LICENSING, LLC
Primary examiner
Ryan Bertram
Primary examiner
Trang K Ta
Application number
15349203
Kind
B2
Document number
10324850
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Serial Lookup of Tag Ways

10324850 - 15349203 - USPTO

Application Nov 11, 2016 - Publication Jun 18, 2019

Patrick P. Lai Robert Allen Shearer

Abstract

A cache system is configurable to trade power consumption for cache access latency. When it is desired for a system with a cache to conserve dynamic power, the lookup of accesses (e.g., snoops) to cache tag ways is serialized to perform one (or less than all) tag way access per clock (or even slower). Thus, for an N-way set associative cache, instead of performing a lookup/comparison on the N tag ways in parallel, the lookups are performed one tag way at a time. This take N times more cycles thereby reducing the access/snoop bandwidth by a factor of N. However, the power consumption of the serialized access when compared to ‘all parallel’ accesses/snoops is reduced.

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