Invention Grant
- Patent Title: System cache with coarse grain power management
- Patent Title (中): 具有粗粮电源管理的系统缓存
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Application No.: US13629563Application Date: 2012-09-27
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Publication No.: US09218040B2Publication Date: 2015-12-22
- Inventor: Sukalpa Biswas , Shinye Shiu , Rong Zhang Hu
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Meyertons, Hood, Kivlin, Kowert & Goetzel, P.C.
- Agent Rory D. Rankin
- Main IPC: G06F1/32
- IPC: G06F1/32

Abstract:
Methods and apparatuses for reducing power consumption of a system cache within a memory controller. The system cache includes multiple ways, and individual ways are powered down when cache activity is low. A maximum active way configuration register is set by software and determines the maximum number of ways which are permitted to be active. When searching for a cache line replacement candidate, a linear feedback shift register (LFSR) is used to select from the active ways. This ensures that each active way has an equal chance of getting picked for finding a replacement candidate when one or more of the ways are inactive.
Public/Granted literature
- US20140089590A1 SYSTEM CACHE WITH COARSE GRAIN POWER MANAGEMENT Public/Granted day:2014-03-27
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