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6 – Sequential Logic Implementation

© 1996 Gaetano Borriello

Example: vending machine (two-level logic implementation)

30

D1 = Q1 + D + Q0N

D0 = Q0'N + Q0N' + Q1N + Q1D

OPEN = Q1Q0

if FFs do not have a reset pin then

D1 = reset'(Q1 + D + Q0N)

D0 = reset'(Q0'N + Q0N' + Q1N + Q1D)

K-map for Open

K-map for D0

K-map for D1

N

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