时序裕量(S|ack) 1. Slack is the margin by which a timing requirement was met or not met 2. A positive slack value, displayed in black, indicates the margin by which a requirement was met 3.A negative slack value, displayed in red, indicates the margin by which a requirement was not met. 4. Slack time is calculated using the following equation slack E <required maximum P2P time> <actual maximum P2P time>
时序裕量（Slack） 1. Slack is the margin by which a timing requirement was met or not met. 2. A positive slack value, displayed in black, indicates the margin by which a requirement was met. 3. A negative slack value, displayed in red, indicates the margin by which a requirement was not met. 4. Slack time is calculated using the following equation: slack = <required maximum P2P time> - <actual maximum P2P time>
Timing Analyzer Summary Type Slack Required Actual Time Time Worst-case tsu NA None 4.500ns Worst-case tco NA None 10.900ns Worst-case th NA None 1.000ns Worst-case Minimum tco n/A None 9.600ns Clock Setup: ' clk NA None 96.15MHz
Timing Analyzer Summary Type Slack Required Time Actual Time Worst-case tsu N/A None 4.500 ns Worst-case tco N/A None 10.900 ns Worst-case th N/A None 1.000 ns Worst-case Minimum tco N/A None 9.600 ns Clock Setup: 'clk' N/A None 96.15 MHz
独立时钟和衍生时钟 Absolute clock derived clock 概念 1. absolute clock 不依赖于其他时钟信号而存在的时钟 2. derived clock 由某个 absolute clock经过相移、分频、倍频 而得到的时钟 时序分析的处理: 1.一个设计可以允许有多个独立时钟存在 2.只对一个独立时钟内相关的所有信号进行时序分 析
独立时钟和衍生时钟 （absolute clock & derived clock） ❖ 概念： 1. absolute clock 不依赖于其他时钟信号而存在的时钟 2. derived clock 由某个absolute clock 经过相移、分频、倍频 而得到的时钟 ❖ 时序分析的处理： 1. 一个设计可以允许有多个独立时钟存在 2. 只对一个独立时钟内相关的所有信号进行时序分 析
占空比( Duty cycle(%)) .o Indicates the percentage of time that the signal is high or low during the time period 5 10.0ns 20.0ns 30.0ns 40.0ns ame 16.825ns clk1 c112 clk
占空比（Duty cycle (%) ） ❖ Indicates the percentage of time that the signal is high or low during the time period
行波时钟( Ripple Clock 触发器翰此作为题動时新 DFF DFF DFF DFF D Q D Q D Q CK ON SCK ON DCK ON DCK ONb 00 Q1 不建议使用
行波时钟（Ripple Clock） 不建议使用 D触发器 输出作为 驱动时钟