Issue No. 09 - September (1983 vol. 32)
R. Gnanasekaran , Department of Electrical Engineering, Gannon University
A recent paper by Chen and Willoner  forwarded a bit-sequential input and output (LSBfirst) multiplier for positive numbers. This multiplier for n-bit operands requires 2n clocks and 2n number of five-input adder modules. In this correspondence, after a brief discussion on the different claims made by the authors of  and their limitations, we show that this multiplier can be realized with only n adder modules. The technique is extended to two's complement number system. Also, a more complete picture of the actual implementation is depicted. Finally, we bring to the attention an already existing multiplier which fits into the bit-sequential multiplier category.
two's complement number representation, Add-shift multiplier, bit-sequential multiplier, carry-save addition, on-line multiplication
R. Gnanasekaran, "On a Bit-Serial Input and Bit-Serial Output Multiplier," in IEEE Transactions on Computers, vol. 32, no. , pp. 878-880, 1983.