*(This code was contributed by Jeff Cassidy at Isophase Computing
(jeff@isophase-computing.ca, https://github.com/isophase), with edits
by myself.)*

Converts a Reflected Binary Gray Code to the corresponding unsigned binary number.

Because of the abundance of binary adder/subtractor logic on an FPGA, if you want to do arithmetic with a Gray Code number, you are better off to first convert it to binary, do the math, then convert it back to Gray Code.

`default_nettype none module Gray_to_Binary_Reflected #( parameter WORD_WIDTH = 0 ) ( input wire [WORD_WIDTH-1:0] gray_in, output reg [WORD_WIDTH-1:0] binary_out ); localparam ZERO = {WORD_WIDTH{1'b0}}; initial begin binary_out = ZERO; end function [WORD_WIDTH-1:0] gray_to_binary ( input [WORD_WIDTH-1:0] gray ); integer i; reg [WORD_WIDTH-1:0] binary; begin binary[WORD_WIDTH-1] = gray[WORD_WIDTH-1]; for(i=WORD_WIDTH-2; i >= 0; i=i-1) begin binary[i] = binary[i+1] ^ gray[i]; end gray_to_binary = binary; end endfunction always@(*) begin binary_out = gray_to_binary(gray_in); end endmodule