Note that in the class we studied only A + B, and A - B. We used a mode bit M to control if the circuit should compute A+B or A-B. Here, we have three operations, which means 2 mode bits M, Mo are required to control the operation of the circuit. B: B1 A Ca Cout Ca Cour Cia Cout Cout Full Adder Full Adder Full Full Adder Adder This circuit shows the Mode bit M, and two handles two operations, A + B, and A- B. You are required to modify this circuit such that it can handle three operations, A+B, A-B, B-A. You would need two mode bits to handle three operations.

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Digital Logic Design
4-bit Binary Adder / Subtractor

Note that in the class we studied only A + B, and A - B. We used a mode bit M to control if the circuit should
compute A+B or A-B. Here, we have three operations, which means 2 mode bits M1 Mo are required to
control the operation of the circuit.
B:
B1
Bo
Bs
M
A:
A1
Ao
Ci Cout
Cin Cout
Cout
Cout
Full
Full
Full
Cin
Full
Cin
Adder
Adder
Adder
Adder
This circuit shows the Mode bit M, and two handles two operations, A + B, and A – B. You are required to
modify this circuit such that it can handle three operations, A+B, A-B, B-A. You would need two mode bits to
handle three operations.
Transcribed Image Text:Note that in the class we studied only A + B, and A - B. We used a mode bit M to control if the circuit should compute A+B or A-B. Here, we have three operations, which means 2 mode bits M1 Mo are required to control the operation of the circuit. B: B1 Bo Bs M A: A1 Ao Ci Cout Cin Cout Cout Cout Full Full Full Cin Full Cin Adder Adder Adder Adder This circuit shows the Mode bit M, and two handles two operations, A + B, and A – B. You are required to modify this circuit such that it can handle three operations, A+B, A-B, B-A. You would need two mode bits to handle three operations.
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