Implement Half Adder with Decoder In Logisim

Implement Half Adder with Decoder In Logisim

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A. Implement Half Adder with Decoder In Logisim, create a sub circuit in your project and name it Half Adder. For this circuit, obtain the truth table for the Half Adder sub circuit and use a 2×4 decoder (can be found under Plexers in the Logisim component menu) to implement. You will also need an OR gate for this circuit.

Make sure to test this sub circuit before proceeding and ensure it matches what you expect. Record these results as expected and simulated.

B. Implement Full Adder with Half Adder Sub Circuit Next, create another sub circuit in Logisim with the name Full Adder. Use the Half Adder sub circuit to construct the full adder (lecture has a slide showing how to utilize two half adders to make a full adder).

Again, make sure to test this circuit before proceeding. Record your results as expected and simulated.

C. Implement 4-Bit Binary Adder Finally, navigate to your main circuit and build a 4-bit binary adder using several full adders

that you just developed. You may find it easier to use wire bundles/splitters here to group your x and y inputs as well as the sum output, however, it is up to you.

Make sure to test the circuit and record your results as expected and simulated. Note that for this circuit, it would be too complex to document the whole truth table (truth table of 9 input variables). Pick representative samples of your inputs to test the circuit.

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