Multi-Level Logic: Tools for Simplication

Two-bit Adder

.inputs a b c d

.outputs x y z

.names a c z [22] x

---1 1

11-- 1

-10- 1

.names a b c d x z [22] y

1---0-- 1

--1---1 1

-11-0-- 1

--110-- 1

---100- 1

.names a b c d z

-0-1 1

-1-0 1

0-10 1

.names a d z [22]

110 1

.end

Z = B' D + B D' + A' C D'

[22] = A D Z'

X = [22] + A C + C Z'

Y = A X + C [22] + B C X' + C D X' + D X' Z'

8 logic levels!

Mis Output

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