The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 2016
Filed:
Mar. 25, 2014
Apple Inc., Cupertino, CA (US);
Prashant Jain, San Jose, CA (US);
Brian P. Lilly, San Francisco, CA (US);
Mahnaz Sadoughi-Yarandi, Santa Clara, CA (US);
Helen Huang, Sunnyvale, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
Systems and methods for reducing leakage power in a L2 cache within a SoC. The L2 cache is partitioned into multiple banks, and each bank has its own separate power supply. An idle counter is maintained for each bank to count a number of cycles during which the bank has been inactive. The temperature and leaky factor of the SoC are used to select an operating point of the SoC. Based on the operating point, an idle counter threshold is set, with a high temperature and high leaky factor corresponding to a relatively low idle counter threshold, and with a low temperature and low leaky factor corresponding to a relatively high idle counter threshold. When a given idle counter exceeds the idle counter threshold, the voltage supplied to the corresponding bank is reduced to a voltage sufficient for retention of data but not for access.