Question: Design a 4 - bit adder / subtractor circuit with inputs A [ 3 : 0 ] , B [ 3 : 0 ] ,

Design a

4 -

bit adder

/

subtractor circuit with inputs A

[3

:

0],

B

[3

:

0],

and select bit X

.

If X

= 0,

then A

+

B is performed. If X

= 1,

then A B is performed. Ignore overflow. Available components: Full adders,

2 -

to

- 1

muxes, NOT gates.

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