Discussion in 'Homework Help' started by Justine1, Jul 26, 2010.

1. ### Justine1 Thread Starter New Member

Jul 26, 2010
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How to implement a Full Adder Circuit using a 2:1 MUX?

2. ### JDT Well-Known Member

Feb 12, 2009
658
87

A full adder has three inputs: A and B and Carry-in. Two outputs: Sum and Carry-out.

This cannot be implemented with only one 2:1 multiplexer. A number will be required. So not sure about "a" in your question.

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3. ### Justine1 Thread Starter New Member

Jul 26, 2010
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How can I implement A Full Adder using a 4:1 MUX?

4. ### beenthere Retired Moderator

Apr 20, 2004
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Per post #2, draw up a truth table. Think about a multiplexer and how to make the output agree with the truth table. A full adder requires a carry bit - can a MUX do that by itself?

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5. ### Justine1 Thread Starter New Member

Jul 26, 2010
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Can anyone please tell me how to implement a full Adder circuit using two 2:1 MUX?...

6. ### beenthere Retired Moderator

Apr 20, 2004
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295
This is a stone wall project for students.

Build up to it with a half adder. make the truth table using A & B as the two bits, X as the output. Look at a MUX and see if you can't get A & B to select the X value in the truth table for the multiplexer's output.

Do this, and all else becomes clear.