Simultaneous Dual Function Half Adder-Subtractor

The circuit is a dual-function half adder and half subtractor. AgMd = Augend/Minuend Input AdSd = Addend/Subtrahend Input COh = (Half Adder) Carry Output SUMhDIFh = (Half Adder) Sum / (Half Subtractor) Difference Output BOh = (Half Subtractor) Borrow Output The result of adding the values at AgMd (treated as augend) and AdSd (treated as addend) can be obtained from SUMhDIFh (treated as half adder sum) and COh (half adder carry output) pair. The result of subtracting the values at AgMd (treated as minuend) and AdSd (treated as subtrahend) can be obtained from SUMhDIFh (treated as half subtractor difference) and BOh (half subtractor borrow output) pair.