Implementation of Area Efficient Multiplexer Based Cordic

M. Madhava Rao, G. Suresh

Abstract: In this paper the efficacy of this approach is studied for the implementation on FPGA. For this study, both non pipelined and 2 level pipelined CORDIC with 8 stages and using two schemes one using adders in all the stages and another using multiplexers in the second and third stages. A 16 bit CORDIC for generating the sine/cosine functions is implemented using all the four schemes on both Xilinx Virtex 6 FPGA (XC6VLX240) and Altera Cyclone II FPGA (EP2C20F484C7). From the implementation results, it is found that the non pipelined and pipelined CORDICs using multiplexer requires 1.6, 1.4 times lower area in Xilinx FPGA and 1.8, 1.6 times lower area in Altera FPGA than that using only adders. This is achieved without reduction in speed. It has also been observed that pipeline CORDIC reduces the number of resources by 7.5 % as compared to original CORDIC. In addition to it power dissipation in pipeline CORDIC has also been reduced by 6.75 % as compared to original CORDIC.

Keywords: CORDIC, rotation mode, multiplexer, pipelining, FPGA