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Modify your 4-bit adder to become a 4-bit adder/subtractor (see slide adders- 8). Your adder/subtractor has an additional input signal, subtract. If subtract = 0,
Modify your 4-bit adder to become a 4-bit adder/subtractor (see slide adders-
8). Your adder/subtractor has an additional input signal, subtract. If subtract = 0,
the circuit adds A + B. If subtract = 1, the circuit subtracts A B. Simulate the
operation as above, but with the subtract signal low for the first half and high for
the second half. This uses Quartus Prime Program.
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