One bit And/Or/Add/Sub ALU

• sub ==> add with negative “b” operand

• Negative “b” ==> complement and add 1

Addition

Cout

Cin

op

AND

OR

0

1

2

a

b

Binvert

0

1

Binvert

0 ==> add

1 ==> sub

Cin0

0 ==> add

1 ==> sub

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