EX6-3.6 Full Subtractor circuit

EX6-3.6  Full Subtractor circuit


//===============================
// ex6-3.6 Full Substrator circuit

module EX10_14( A, B ,Bin ,Bout ,Diff);

input  A,B,Bin ; // 1位元輸入

output  reg Bout ,Diff ; // Output    1位元輸出

always@ ( A,B) begin

{Bout ,Diff}= A-B-Bin;
end
endmodule


//===============================
// 時間單位 100ns, 時間精確度100 ps
`timescale 100ns/100ps   
module Test_bench;
    // Inputs
    reg A,B,Bin;

    // Outputs
    wire Bout ,Diff ;

    // Instantiate the Unit Under Test (UUT)
    // ex6-3.5 Half Substrator circuit
     EX10_14  UUT (
        .A(A),
        .B(B),
        .Bin(Bin),
        .Bout(Bout) ,
        .Diff(Diff)
    );

    initial begin
        $monitor( A, B ,Bin,Bout ,Diff);
        //Apply inputs
A=1'b0; B=1'b0; Bin=1'b0;
        #100;
{A,B,Bin}=3'b001;
        #100;
{A,B,Bin}=3'b010;
        #100;
{A,B,Bin}=3'b011;
        #100;
{A,B,Bin}=3'b100;
        #100;
        {A,B,Bin}=3'b101;
        #100;
{A,B,Bin}=3'b110;
        #100;
{A,B,Bin}=3'b111;
        #100;             
 
    end
    initial begin
#800  $stop;
end
endmodule