组合电路功耗敏感性统计分析  

Power Sensitivity Analysis of Combinational Circuits Using Statistical Method

作　　者：徐勇军[1,2] 韩银和[1,2] 李华伟[1,2] 李晓维[1,2] 

机构地区：[1]中国科学院计算技术研究所信息网络室,北京100080 [2]中国科学院研究生院,北京100039

出　　处：《计算机辅助设计与图形学学报》2005年第1期122-128,共7页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金重点项目(90207002);国家"八六三"高技术研究发展计划(2001AA111070)

摘　　要：功耗已经成为集成电路设计的一个十分重要的问题 对于一个给定的电路 ,其功耗是与输入密切相关的 ,即对于不同的输入向量集 ,同一电路可能会有不同的功耗 功耗敏感性定义了由于原始输入的改变而引起的功耗变化特性 文中给出了基于信号置 1概率和跳变率传输特性的功耗敏感性分析方法 ,并详细阐述了它在无时延动态功耗估计和静态功耗估计中的应用 实验结果表明 ,它在保证了较好精度的条件下 ,大大降低了估计时间 ;另外 ,这一方法还可以应用于时延动态功耗估计、在特定向量集上的动态及静态功耗估计 。Power dissipation has become one of the critical problems in the VLSI circuit design. For a given logic circuit, the power dissipation has strong relationship with the primary inputs. Circuits consume different power under different input vectors. Power sensitivity (PS) defines the characteristics of power dissipation due to changes in the states of primary inputs. In this paper, we study the problems and present a method to evaluate the PS based on the propagation of signal probability and activity. Then, we focus on its applications on the estimation of zero delay dynamic power and static power in detail. Experiments show that the method can greatly reduce the evaluation time with an acceptable accuracy. As a matter of fact, the statistical method can also be used in dynamic power estimation under delay models, input-specific power estimation, and the design of low power system.

关 键 词：功耗估计 功耗敏感性 信号置1概率 Shannon展开 

分 类 号：TP391.72[自动化与计算机技术—计算机应用技术]