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Digital Logic Circuits 19
COMBINATIONAL
Half Adder xy c s
00
000 1 x0
010 1 c=
100 0
111
y
Full Adder
00
x y cn-1 cn s
000 0 0 01
001 0 1
010 0 1 x 11
011 1 0
100 0 1 01
101 1 0
110 1 0 cn
111 1 1
cn = x
x =x
y
s = x’y
=x
cn-1
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