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3 � Combinational Logic Implementation

� 1996 Gaetano Borriello

Conversion between forms (cont'd)

9

• Example: verify equivalence of two forms

Z = [ (A � B)' � (C � D)' ]'

= [ (A' + B') � (C' + D') ]'

= [ (A' + B')' + (C' + D')' ]

= (A � B) + (C � D) �

A

B

C

D

Z

NAND

NAND

NAND

A

B

C

D

Z

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