N bit comparator

N bit comparator: 

A magnitude digital Comparator is a combinational circuit that compares two digital or binary numbers in order to find out whether one binary number is equal, less than, orgreater than the other binary number.

`timescale 1ns / 1ps

module comparator_nbit(a,b,Lesser,Greater,Equal);

parameter n=32;

input [n-1:0]a,b;

output Lesser,Greater,Equal;

reg Lesser=0,Greater=0,Equal=0;

always @ (a,b)

begin

if(a>b)

begin

Lesser=0;Equal=0;Greater=1;

end

else if (a<b)

begin

Lesser=1;Equal=0;Greater=0;

end

else

begin

Lesser=0;Equal=1;Greater=0;

end

end

endmodule

Test bench code:

`timescale 1ns / 1ps

module comparator_nbit_tb;

        // Inputs

        reg [31:0] a;

        reg [31:0] b;

        // Outputs

        wire Lesser;

        wire Greater;

        wire Equal;

        // Instantiate the Unit Under Test (UUT)

        comparator_nbit uut (

                .a(a), 

                .b(b), 

                .Lesser(Lesser), 

                .Greater(Greater), 

                .Equal(Equal)

        );

initial begin

        $monitor(" A=%d B=%d Lesser=%b Greater=%b Equal=%b ",a,b,Lesser,Greater,Equal);

        end

        initial begin

           a = 2;b = 2;

                #100 a=22;b=444;

                #100 a=444;b=555;

                #100 a=777;b=111;

                #100 a=8888;b=8888;

                #500 $finish;

        end

endmodule

#verilog #rtl N bit comparator using Verilog