公开(公告)号：US20150277541A1

公开(公告)日：2015-10-01

申请号：US14224773

申请日：2014-03-25

Applicant: Apple Inc.

Inventor： Prashant Jain ,  Brian P. Lilly ,  Mahnaz Sadoughi-Yarandi ,  Helen Huang

IPC: G06F1/32

CPC classification number: G06F1/3275 ,  G06F1/3225 ,  G06F1/3296 ,  G06F12/0802 ,  G06F12/0846 ,  G06F12/0864 ,  G06F2212/1028 ,  G06F2212/502 ,  G06F2212/601 ,  G11C5/14 ,  G11C7/04 ,  G11C7/12 ,  G11C2207/2227 ,  Y02D10/13 ,  Y02D10/14 ,  Y02D10/172 ,  Y02D50/20

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.

Abstract translation: 降低SoC内二级缓存中漏电功率的系统和方法。 L2缓存分为多个银行，每个银行都有自己独立的电源。 为每个银行维护一个空闲计数器来计算银行已经不活动的周期数。 SoC的温度和泄漏因子用于选择SoC的工作点。 基于操作点，设置空闲计数器阈值，具有对应于相对低的空闲计数器阈值的高温度和高泄漏因子，以及对应于相对高的空闲计数器阈值的低温度和低泄漏因子。 当给定的空闲计数器超过空闲计数器阈值时，提供给相应存储体的电压降低到足以保留数据但不能访问的电压。

公开(公告)号：US09513693B2

公开(公告)日：2016-12-06

申请号：US14224773

申请日：2014-03-25

Applicant: Apple Inc.

Inventor： Prashant Jain ,  Brian P. Lilly ,  Mahnaz Sadoughi-Yarandi ,  Helen Huang

IPC: G06F1/32 ,  G11C7/12 ,  G06F12/08

CPC classification number: G06F1/3275 ,  G06F1/3225 ,  G06F1/3296 ,  G06F12/0802 ,  G06F12/0846 ,  G06F12/0864 ,  G06F2212/1028 ,  G06F2212/502 ,  G06F2212/601 ,  G11C5/14 ,  G11C7/04 ,  G11C7/12 ,  G11C2207/2227 ,  Y02D10/13 ,  Y02D10/14 ,  Y02D10/172 ,  Y02D50/20

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.

Abstract translation: 降低SoC内二级缓存中漏电功率的系统和方法。 L2缓存分为多个银行，每个银行都有自己独立的电源。 为每个银行维护一个空闲计数器来计算银行已经不活动的周期数。 SoC的温度和泄漏因子用于选择SoC的工作点。 基于操作点，设置空闲计数器阈值，具有对应于相对低的空闲计数器阈值的高温度和高泄漏因子，以及对应于相对高的空闲计数器阈值的低温度和低泄漏因子。 当给定的空闲计数器超过空闲计数器阈值时，提供给相应存储体的电压降低到足以保留数据但不能访问的电压。