Gray to binary

Theory:

A Gray to Binary code converter is a tool or algorithm that translates a number represented in Gray code into its equivalent binary representation, using the principle of exclusive OR (XOR) operations.

Block diagram:

Truth Table:

Verilog code:

module gb(g2,g1,g0,

     b2,b1,b0);

    input g2,g1,g0;

    output b2,b1,b0;

    assign b2=g2;

assign b1=(g2^g1);

assign b0=g2^(g1^g0);

endmodule

Test bench:

module gb_tb;

reg g2;

reg g1;

reg g0;

wire b2;

wire b1;

wire b0;

gb uut (

.g2(g2), 

.g1(g1), 

.g0(g0), 

.b2(b2), 

.b1(b1), 

.b0(b0)

);

initial begin

g2 = 0;g1 = 0;g0 = 0;#100;

g2 = 0;g1 = 0;g0 = 1;#100;

g2 = 0;g1 = 1;g0 = 0;#100;

g2 = 0;g1 = 1;g0 = 1;#100;

g2 = 1;g1 = 0;g0 = 0;#100;

g2 = 1;g1 = 0;g0 = 1;#100;

g2 = 1;g1 = 1;g0 = 0;#100;

g2 = 1;g1 = 1;g0 = 1;#100;

       end

     endmodule

Output:

RTL schematic view: