公开(公告)号：US10296069B2

公开(公告)日：2019-05-21

申请号：US15634956

申请日：2017-06-27

Applicant: QUALCOMM INCORPORATED

Inventor： Richard Stewart ,  Dexter Chun

IPC: G06F1/32 ,  G06F1/3234 ,  G06F1/3237 ,  G06F13/16 ,  G06F13/40 ,  G06F1/3296 ,  G06F1/3225 ,  G06F1/324

Abstract: Systems, methods, and computer programs are disclosed for reducing dynamic random access memory (DRAM) power consumption within a selected voltage frequency/bin. One embodiment is a method comprising receiving a selected voltage/frequency bin for operating a memory bus electrically coupling a memory controller to a dynamic random access memory (DRAM). The method monitors a bandwidth of the memory bus while operating at the selected voltage/frequency bin. The method frequency switches a clock for the memory bus, based on the monitored bandwidth, between a plurality of predefined frequencies within the selected voltage/frequency bin to maintain a target bandwidth.

公开(公告)号：US20170212581A1

公开(公告)日：2017-07-27

申请号：US15005534

申请日：2016-01-25

Applicant: QUALCOMM INCORPORATED

Inventor： Hee Jun Park ,  Richard Stewart

IPC: G06F1/32 ,  G06F13/40 ,  G06F13/16 ,  G06F1/28 ,  G06F12/08

CPC classification number: G06F1/3296 ,  G06F1/28 ,  G06F1/3206 ,  G06F1/3253 ,  G06F1/3275 ,  G06F12/0802 ,  G06F13/16 ,  G06F13/4068 ,  G06F2212/1021 ,  Y02D10/13 ,  Y02D10/14 ,  Y02D10/151

Abstract: Systems, methods, and computer programs are disclosed for controlling power efficiency in a multi-processor system. The method comprises determining a core stall time due to memory access for one of a plurality of cores in a multi-processor system. A core execution time is determined for the one of the plurality of cores. A ratio of the core stall time versus the core execution time is calculated. The method dynamically scales a frequency vote for a memory bus based on the ratio of the core stall time versus the core execution time.