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2 – Combinational Logic

© 1996 Gaetano Borriello

Karnaugh maps and don't cares

• f(A,B,C,D) = ??m(1,3,5,7,9) + d(6,12,13) f = without don't cares f = with don't cares

51

0 0 X 0

1 1 X 1

1 1 0 0

0 X 0 0

AB

CD

A

B

D

00

01

11

10

00

01

11

10

C

don't cares can be treated as1s or 0sdepending on which is more advantageous

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