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minhkhoa2011

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**Logic design - Full subtractor question - need help !**

## Homework Statement

My professor gave my class this question but I really do not know how to solve.

The circuit will perform the subtraction where A<3:0>; B<3:0>; C<3:0>; D<3:0> represent 4-digit binary number.

a) Complement the schmetic by entering the node name S<4:0>; P<4:0>; C<3:0>; D<3:0>

Any help will be appreciated!

thanks all .

## Homework Equations

## The Attempt at a Solution

I know that I have to use the diagram but I do not know where to start from :-[