Karnaugh maps and don't cares (cont'd)

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

by using don't care as a "1"a 2-cube can be formed rather than a 1-cube to coverthis node

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

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