通过编码的方式来解决延迟问题

1. 通过编码的方式来解决延迟问题 报告人 ：孙修晨 导师： 肖夏 日期：2012年9月4日

2. 主要内容 1.互连布线存在问题的简单介绍 2.用编码解决互连延迟的基本方法 3.编码方式的简单介绍 4.通过编码可以解决哪些方面的问题 5.我们可以通过哪些方面对其进行改进 6.Hspice仿真结果 7. Tianjin University

3. 互连布线存在问题的简单介绍 1.随着特征尺寸的减小和时钟频率的增加，互连特性在芯片的整体电路性能上有着显著的影响，特别是延时对电路的影响最为显著。 2.随着互连距离的减小,耦合电容变得越来越大，已经成为影响互连延时的主要因素。 3.信号在互连线上传输，由于信号线上信号跳变的不同会导致信号的延时的不同。 4.不仅信号的跳变会影响延时而且还会影响到动态功耗。 Tianjin University

4. 用编码解决互连延迟的基本方法 • BI-Bus Invert (1995) • PBI-Partial Bus-invert(1998) • OEBI-odd/Even Bus Invert(2002) • DSM-BI Deep Sub-Micron Bus Invert(2004) • Khan-Low power system on chip bus encoding scheme with crosstalk noise reduction capability(2006) • Fan-Efficient RC low-power bus encoding methods for crosstalk reduction (2010) • Reduction of Crosstalk in RC Modeled Interconnects • with Low Power Encoder(2011) Tianjin University

5. BI-Bus Invert 1.8位数据线的信号跳变的概率(switching activity) 2.汉明距离：在一个码组集合中，任意两个码字之间对应位上码元取值不同的位的数目定义为这两个码字之间的汉明距离。即d(x,y)=∑x[i]⊕y[i]，这里i=0,1,..n-1，x,y都是n位的编码，⊕表示异或 Tianjin University

6. BI-Bus Invert • 通过降低信号的跳变减小电容的充放电过程，从而降低功耗 Tianjin University

7. OEBI-odd/Even Bus Invert switch activities for load capacitance switch activities for coupling capacitance Tianjin University

8. OEBI-odd/Even Bus Invert Tianjin University

9. OEBI-odd/Even Bus Invert Tianjin University

10. DSM-BI Deep Sub-Micron Bus Invert dynamic power Tianjin University

11. DSM-BI Deep Sub-Micron Bus Invert Tianjin University

12. DSM-BI Deep Sub-Micron Bus Invert Tianjin University

13. Low power system on chip bus encoding scheme with crosstalk noise reduction capability E=E1+E2+E3 例如从101跳变到010，则 Tianjin University

14. Low power system on chip bus encoding scheme with crosstalk noise reduction capability Tianjin University

15. Low power system on chip bus encoding scheme with crosstalk noise reduction capability • 4位数据线上的信号从0101跳变到1010时，所消耗的能量 Tianjin University

16. Low power system on chip bus encoding scheme with crosstalk noise reduction capability Tianjin University

17. Efficient RC low-power bus encoding methods for crosstalk reduction • 首次提出采用5位数据线进行编码 • The first reason is that we can eliminate the Type-4 coupling in a 5-bit bus • when our bus encoding methods are used • The second reason is that the probability of Type-4 coupling occurrence is increased • when a bus width exceeds a 5-bit bus width • The third reason is that a 5-bit bus needs a smaller area than a 6-bit bus with the shielding wire. • The fourth reason is that the bus encoding methods with a 5-bit bus • reduce more coupling and switching activities than those with a bus larger than 5-bit bus Tianjin University

18. Efficient RC low-power bus encoding methods for crosstalk reduction Tianjin University

19. Efficient RC low-power bus encoding methods for crosstalk reduction Tianjin University

20. Reduction of Crosstalk in RC Modeled Interconnects with Low Power Encoder • 在面积、功耗、延时上均有突破 Tianjin University

21. Reduction of Crosstalk in RC Modeled Interconnects with Low Power Encoder Tianjin University

22. Reduction of Crosstalk in RC Modeled Interconnects with Low Power Encoder Tianjin University

23. 通过编码可以解决哪些方面的问题 • Wire propagationdelay • Dynamic power reduction • Crosstalk reduction • Coupling and switching activities • Area/Power • Number of transitions Tianjin University

24. 谢谢