GATE EC 2014 Set 3 — Question 52
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Digital Circuits → Combinational Logic → Adders & Subtractors
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Question
If and are inputs and the Difference () and the Borrow () are the outputs, which one of the following diagrams implements a half-subtractor?
Correct answer
(A) [figure]
Solution
A half-subtractor has two outputs: Difference () and Borrow ().
In option (A):
In option (A):
- The first 2:1 MUX has inputs and select line . Its output is .
- The second 2:1 MUX has inputs and select line . Its output is .
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