PPT Slide

6 – Sequential Logic Implementation

© 1996 Gaetano Borriello

Example: vending machine (retiming)

32

• OPEN = Q1Q0

  • combinational delay after Q1 and Q0 change

• This can be corrected by retiming

  • move flip-flops and logic through each other to improve delay

• OPEN = reset'(Q1 + D + Q0N)(Q0'N + Q0N' + Q1N + Q1D) = reset'(Q1Q0N' + Q1N + Q1D + Q0'ND + Q0N'D)

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