Hi My Verilog code compiles with no errors but there is no output when it runs

Question

Hi this code is supposed to represent NOR and NAND gate in HDL my benchtest gives not outputs but compiles, I dont know what the problem is.Thanks in advance

   module ipriority_encoder_gates(output x,y,V,input D0,D1,D2,D3);//V2001
   wire w1,D2_not;
   not (D2_not,D2);
   or  (x,D2,D3);
   or  (V,D0,D1,x);
   and (w1,D2_not,D1);
   or  (y,D3,w1);
   endmodule

   /* Benchtest begins here */
   module priority_encoder_beh(output reg X,Y,V,input D0,D1,D2,D3);
   always @ (D0,D1,D2,D3)begin
   X=0;
   Y=0;
   V=0;
   casex ({D0,D1,D2,D3})
    4'b0000: {X,Y,V}=3'bxx0;
    4'b1000: {X,Y,V}=3'b001;
    4'bxx10: {X,Y,V}=3'b011;
    4'bxx10: {X,Y,V}=3'b101;
    4'bxxx1: {X,Y,V}=3'b111;
    default: {X,Y,V}=3'b000;
    endcase
    end
    endmodule

    module t_priority_encoder_beh();
    wire X,Y,V;
    reg D0,D1,D2,D3;
    integer k;

    priority_encoder_beh M0(X,Y,V,D0,D1,D2,D3);

    initial #200 $finish;
    initial begin
    k=32'bx;
    #10 for(k=0;k<= 16;k=k+1) #10{D0,D1,D2,D3}= k;
    end
    endmodule

Jared Davis · Accepted Answer · 2015-04-21 03:33:50Z

1

If you are running a Verilog simulator such as NCVerilog, VCS, etc., then you probably won't be seeing any output because your code doesn't contain, e.g., any $display statements or $monitor statements.

For instance, you might try replacing:

initial begin
    k=32'bx;
    #10 for(k=0;k<= 16;k=k+1) #10{D0,D1,D2,D3}= k;
end

With something like:

initial begin
    k=32'bx;
    #10 for(k=0;k<= 16;k=k+1)
    begin
       #10{D0,D1,D2,D3}= k;
       $display("D=%b, X=%b, Y=%b, V=%b", {D0,D1,D2,D3}, X, Y, V);
    end
end

answered Apr 21, 2015 at 3:33

Jared Davis

5694 silver badges12 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Hi My Verilog code compiles with no errors but there is no output when it runs

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related