Crosstalk Aware Register Reallocation Method for Green Compilation

As nanoscale processing becomes the mainstream in IC manufacturing, the crosstalk problem rises as a serious challenge, not only for energy-efficiency and performance but also for security requirements. In this paper, we propose a register reallocation algorithm called Nearby Access based Register Reallocation (NARR) to reduce the crosstalk between instruction buses. The method includes construction of the software Nearby Access Aware Interference Graph (NAIG), using data flow analysis at assembly level, and reallocation of the registers to the software. Experimental results show that the crosstalk could be dramatically minimized, especially for 4C crosstalk, with a reduction of 80.84% in average, and up to 99.99% at most.     

深亚微米VLSI设计中的Crosstalk问题分析及消除

随着特征尺寸降低到0.18μm以下,crosstalk日渐成为影响芯片设计成功与否的关键问题。本文分析了的深亚微米VLSI设计中由耦合电容造成的信号间的crosstalk问题,给出了一种峰值噪声电压的估计模型,并结合“龙芯一号”的设计,讨论了利用EDA工具解决crosstalk问题的流程。     

Single Event crosstalk shielding for CMOS logic

With advances in technology scaling, CMOS circuits are increasingly more sensitive to transient pulses caused by Single Event particles. Hardening techniques for CMOS combinational logic have been developed to address the problems associated with Single Event transients, but in these designs, Single Event crosstalk effects have been ignored. In order to complement the Single Event upset (SEU) hardening process, coupling effects among interconnects need to be considered in the Single Event hardening and analysis of CMOS logic gates due to technology scaling effects that increase both SE vulnerability and crosstalk effects. As technologies advance, the coupling effects increasingly cause SE transients to contaminate electronically unrelated circuit paths which can in turn increase the “Single Event susceptibility” of CMOS circuits. Serious effects may occur if the affected line is a clock line or an input line of voters in triple-modular redundancy (TMR) circuit. Hence, this work first analyzes Single Event crosstalk on recent technologies and then proposes hardening techniques to reduce Single Event crosstalk. Hardening results are demonstrated using HSpice Simulations with interconnect and device parameters derived in 90 nm technology.     

基于耦合RLC树模型的互连串扰估计

提出了一个简洁的串扰估计方法。该方法使用耦合RLC树模型来估计高速VLSI下的互连串扰，通过RLC树模型的瞬时计算递归方程和通常的模型降阶对耦合噪声近似，串扰能被快速高效的估计，而且电感效应的影响也能被真实捕获。实验结果显示该方法具有较高的精度。     

对电力线载波重频指标的探讨

对电力线载波的串音衰减和信嗓比之间的关系进行了分析，提出了在线路噪声电平为定值的情况下，大幅度减低电力线载波频率分配重频使用指标的设想。并给出了不同电压等级在生频使用时的最低串音衰减指标。     

运载火箭测量系统上电瞬态干扰测量及串扰分析

对运载火箭测量系统二次电源在上电时产生的瞬态传导干扰源进行测量,得到该瞬态干扰时域以及频域信息。在测量数据的基础上,结合运载火箭常用的线缆,分析该瞬态干扰对邻近设备和线缆的耦合,研究不同线长、不同间距以及端接负载等情况的耦合响应。基于试验和仿真结果,对运载火箭线缆线束的选型、布线提供建议,对工程研究具有指导意义。     

基于时域积分方法分析PCB串扰问题

采用时域积分方程法及改进型节点分析法对PCB板间导线的串扰问题进行建模.时域积分方程法以等效原理为基础,在矩量法应用中加入时间因子的考虑,并采用RWG基函数将模型划分为多个三角面元,从而将导线间的影响以散射的角度来表达.另外采用改进节点分析法对电路边界不连续性进行求解,从而懈决了有限电导率导体和各向同性介质相结合情况下的串扰问题.最后在多层PCB传输线的算例中,计算给出了不同条件下输出电压和串扰电压波形的时域变化,从而对PCB板间信号完整性做出了分析.     

基于多级切换视频监控矩阵系统的设计

矩阵系统作为视频监控的核心正发挥着重要的作用。文中对矩阵系统所存在的固有的信号串扰缺陷进行了比较详尽的分析,提出了多级切换的设计方案。通过举例,给出了以CD22M3494为核心的三级切换硬件构成,及软件设计过程。该方法基本消除了在矩阵系统中各通道之间存在的信号串扰现象,大大提高了视频信号的各项指标。     

降低电缆内导线间串扰电压的优化方法

本文根据分布参数传输线理论导出了电缆内平行多导线间串扰电压的传递函数矩阵表达式;构造了导线同串扰电压最小的优化目标函数;利用可变多面体算法进行了优化设计;根据计算结果提出了降低申扰电压的新方法。计算结果与已有的实验结果吻合。     

隔离线接地孔间距对抑制串扰效能影响的分析

抑制印制电路板上微带线间串扰是高速PCB 信号完整性设计的重要内容。文中研究了在两平行微带线之间加上带有接地孔的隔离线这种方法减小串扰的有效性,讨论了在工作频带内因此发生谐振的孔间距要求,仿真得到了不同情况下的S 参数、电流分布图。通过加上升时间0.1ns、周期1ns 的方波脉冲激励,比较了改善前后端口的串扰的情况,可以看出串扰得到了有效地抑制。