Low Power Consumption Coarse Grained Reconfigurable Adder

Reconfigurable architecture gives the advantage of both high performance and high flexibility. However power consumption is also an important criterion which determines the efficiency of the reconfigurable architecture to be used in data intensive applications like cryptography, multimedia and signal processing. This paper analyzes a coarse grained reconfigurable adder which can be dynamically reconfigured with respect to bitwidth of operands. Using multiplexers and appropriate control bits, part of the architecture may be powered-down according to the requirement, thereby saving power because of the inactive state of unused part. It is described in Verilog HDL and Synthesized on to Xilinx spartan-2 FPGA. Xilinx Xpower analyzer is used to find the power consumption. Experimental results of this design show the edge over existing design in terms of power consumption.