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Unformatted text preview: F 3 =xy+xy Design the circuit with a decoder and some external gates. 4. Using 4 exclusive-OR gates and a four bit full adder, construct a 4-bit parallel adder/subtractor. Use an input select variable V so that when V=0, the circuit adds and when V=1, the circuit subtracts. (Use 2s complement for subtraction)...
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- Spring '10