in the multiplier , a partial product circuit generates a partial product based on a multiplicand operand and outputs of a booth recoder circuit , which operates on a multiplier operand . the partial product circuit ands the multiplicand with a zero booth recoded output , which indicates whether to zero out the multiplicand . an enable circuit selectively enables the multiplier circuit , and more particularly , disables the multiplier circuit by making the zero booth recoded output indicate to zero out the multiplicand .