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show a full adder can be converted to a full subtractor with the addition of just one inverter with the full adder circuit.

on 2011-11-01 19:30:19   by prasenjit   on MCA  1 answers

Arup

on 2011-11-01 09:30:00  

The sum and difference equation is same. Modify on carry/borrow equation. solve the carry and get the equation like carry=BC+A(B XOR C) Solve the borrow and get the equation as Borrow=BC+A'(B XOR C) From the two equation the diff. is only A and A'. Just draw the circuit.