TECHNOLOGY Reversible Logic Based Arithmetic and Logic Unit
Khushboo Ahirwar, Sachin Bandеwar, Anand Kumar Singh, Bhopal India · 2014
Reversible logic has received great attention in th e recent years due to its ability to reduce the pow er dissipation which is the main requirement in low po wer digital design. It has wide applications in adv anced computing, low power CMOS design, Optical information processing, DNA computing, bio information, quantum computation and nanotechnology. Conventional digital circuits dissipate a significant amount of energy because bits of information are erased during the logic operatio ns. Thus, if logic gates are designed such that the information bits are not destroyed, the power consumption can be red uced dramatically. The information bits are not los t in case of a reversible computation. This has led to the develop ment of reversible gates. ALU is a fundamental buil ding block of a central processing unit (CPU) in any computing sy stem; reversible arithmetic unit has a high power o ptimization on the offer. By using suitable control logic to on e of the input variables of parallel adder, various arithmetic operations can be realized. In this paper, ALU base d on a Reversible low power control unit for arithm etic & logic operations is proposed. In our design, the full Add ers are realized using synthesizable, low quantum c ost, low garbage output DPeres gates. This paper presents a novel design of Arithmetic & Logical Unit using Reversible control unit. These Reversible ALU has been modeled and verified using Verilog and Quartus II 5.0 simu lator. Comparative results are presented in terms of numbe r of gates, number of garbage outputs, number of co nstant inputs and Quantum cost.