基于独占式访存调度的片上系统电源门控方法  

A power gating technique based on exclusive memory access scheduling for SoCs

作　　者：刘苏[1,2,3] 苏孟豪[1,3] 苏文 

机构地区：[1]中国科学院计算技术研究所,北京100190 [2]中国科学院大学,北京100049 [3]龙芯中科技术有限公司,北京100190 [4]中国石油北京油气调控中心,北京100007

出　　处：《高技术通讯》2014年第3期256-262,共7页Chinese High Technology Letters

基　　金：国家"核高基"科技重大专项课题(2009ZX01028-002-003;2009ZX01029-001-003;2010ZX01036-001-002);国家自然科学基金(60921002;61003064;61050002;61070025;61100163;61133004;61173001;61232009);863计划(2012AA010901;2012AA011002;2012AA012202;2013AA014301)资助项目

摘　　要：为减少片上系统(SoC)中访存模块的漏电功耗,在分析访存行为的基础上,提出了一种基于独占式访存调度的电源门控方法。该方法根据访存模块对延迟容忍度较高和功耗优化空间很大的特点,利用访存调度器将访存模块的请求集中于窗口中,并在窗口关闭时对访存模块及其访存通路使用电源门控。相对于已有方法,该方法不但增加了电源门控的可用范围,同时可更多地降低漏电功耗。实验结果表明,该方法可以在不影响访存性能的情况下减少访存模块约70%的漏电功耗。Aiming at reducing the leakage power of memory access modules in a system on chip （SoC）, a power gating technique based on exclusive memory access scheduling was proposed after the analysis of memory access behavior. Considering that the memory access modules have high tolerance of latency, the new technique uses a memory ac- cess scheduler to assemble the memory requests into windows, and performs the power gating for the module and its memory access path when the corresponding window is closed. The proposed technique can improve both the scope and effect of power gating. The experimental result shows that the technique can reduce about 70 percent of leakage power of the memory access modules with no performance penalty.

关 键 词：独占式 访存调度 电源门控 片上系统(SoC) 漏电功耗 

分 类 号：TN86[电子电信—信息与通信工程]