scholarly journals Power Efficient Arithmetic Logic Unit Design using Reversible Logic

2015 ◽  
Vol 128 (6) ◽  
pp. 36-41
Author(s):  
Naman Sharma ◽  
Rajat Sachdeva ◽  
Upanshu Saraswat ◽  
Rajat Yadav ◽  
Gunjeet Kaur
Author(s):  
Shaveta Thakral ◽  
Dipali Bansal

Energy loss is a big challenge in digital logic design primarily due to impending end of Moore’s Law. Increase in power dissipation not only affects portability but also overall life span of a device. Many applications cannot afford this loss. Therefore, future computing will rely on reversible logic for implementation of power efficient and compact circuits. Arithmetic and logic unit (ALU) is a fundamental component of all processors and designing it with reversible logic is tedious. The various ALU designs using reversible logic gates exist in literature but operations performed by them are limited. The main aim of this paper is to propose a new design of reversible ALU and enhance number of operations in it. This paper critically analyzes proposed ALU with existing designs and demonstrates increase in functionality with 56% reduction in gates, 17 % reduction in garbage lines, 92 % reduction in ancillary lines and 53 % reduction in quantum cost. The proposed ALU design is coded in Verilog HDL, synthesized and simulated using EDA (Electronic Design Automation) tool-Xilinx ISE design suit 14.2. RCViewer+ tool has been used to validate quantum cost of proposed design.


2015 ◽  
Vol 11 (2) ◽  
pp. 104
Author(s):  
Vandana Shukla ◽  
O. P. Singh ◽  
G. R. Mishra ◽  
R. K. Tiwari

Reversible circuit designing is the area where researchers are focussing more and more for the generation of low loss digital system designs. Researchers are using the concept of Reversible Logic in many areas such as Nanotechnology, low loss computing, optical computing, low power CMOS design etc. Here we have proposed a novel design approach for a 2-bit binary Arithmetic Logic Unit (ALU) using optimized 8:1 multiplexer circuit with reversible logic concept [1]. This ALU circuit can perform complement, transfer, addition, subtraction, multiplication, OR, XOR, NAND functions on given values. The ALU circuit has been simulated on Modelsim tool and synthesised for Xilinx Spartan 3E with Device XC3S500E with 200 MHz frequency. This 2-bit ALU using reversible logic is useful for the designs of low power loss systems.


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