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Timing Analysis

ECE 545 Lecture 8a. Timing Analysis. R equired reading. P. Chu, RTL Hardware Design using VHDL Chapter 8.6 Timing Analysis of a Synchronous Sequential Circuit Chapter 16.1 Overview of a Clock Distribution Network Chapter 16.2 Timing Analysis with Clock Skew. Hold & Setup Time

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Timing Analysis

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  1. ECE 545 Lecture 8a Timing Analysis

  2. Required reading • P. Chu, RTL Hardware Design using VHDL • Chapter 8.6 Timing Analysis of a Synchronous • Sequential Circuit • Chapter 16.1 Overview of a Clock Distribution • Network • Chapter 16.2 Timing Analysis with Clock Skew

  3. Hold & Setup Time Metastability ECE 448 – FPGA and ASIC Design with VHDL

  4. Violation of Hold or Setup Time

  5. Response of a Flip-Flop to Timing Violation There exists a third and unstable point of equilibrium between the two stable states representing the binary states 0 and 1 respectively.

  6. Points of Equilibrium in Flip-Flops and Latches

  7. Patterns of Metastable Behavior

  8. Response to Timing Violation

  9. Impact on Downstream Circuitry

  10. Clock Skew ECE 448 – FPGA and ASIC Design with VHDL

  11. Clock Skew

  12. Clock Skew Map for a Cell Processor

  13. Incorrect Clock Tree Layout – Narrow Meander

  14. Optimized Clock Tree Layout – H Tree

  15. Clock Skew - Summary

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