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Design and Implementation of VLSI Systems (EN1600) Lecture 23: Sequential Circuit Design (2/2)

Design and Implementation of VLSI Systems (EN1600) Lecture 23: Sequential Circuit Design (2/2). Prof. Sherief Reda Division of Engineering, Brown University Spring 2008. [sources: Weste/Addison Wesley – Rabaey/Pearson]. Sequencing methods. Sequencing timing terminology.

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Design and Implementation of VLSI Systems (EN1600) Lecture 23: Sequential Circuit Design (2/2)

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  1. Design and Implementation of VLSI Systems (EN1600) Lecture 23: Sequential Circuit Design (2/2) Prof. Sherief Reda Division of Engineering, Brown University Spring 2008 [sources: Weste/Addison Wesley – Rabaey/Pearson]

  2. Sequencing methods

  3. Sequencing timing terminology

  4. 1. Max-Delay (setup) constraint: Flip-flops

  5. 2. Max-Delay (setup) constraint: 2-phase latches

  6. 2. Min-delay (hold) constraint: Flip-flip

  7. 2. Min-delay (hold) constraint: 2-phase latches

  8. 3. Time borrowing

  9. How much time can be borrowed? Tborrow <= Tc/2 –(tsetup + tnonoverlap)

  10. We have assumed zero clock skew Clocks really have uncertainty in arrival time Decreases maximum propagation delay Increases minimum contamination delay Decreases time borrowing 4. Clock Skew

  11. 4. Skew: flip-flops

  12. 4. Skew: 2-phase latches

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