Feedback and State

2/12/98


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Table of Contents

Feedback and State

Recap: Combinational Synthesis

Motivation: Adding a column of numbers

Implementing State

Implementing State - II

Solutions

Forcing a 0 or a 1

S-R Latch Timing

Timing Rule

D-Latch or Transparent Latch

Simplified D-Latch

How do we fix it?

Fixed D-latch

Timing of D-Latch

Setup and Hold Times

Edge-Triggered Flip-Flop

Timing of Edge-Triggered Flip-Flop

Latches and Flip-Flops

Latch 2 Hold Time (details in recitation)

Next Time: Finite State Machines

Author: Srinivas Devadas

Email: devadas@mit.edu

Home Page: http://cag-www.lcs.mit.edu/6.004

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