Skip to content

Sumadores

1. Códigos

adder.v
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
module adder #(
  parameter Width = 32
) (
  input  signed [Width-1:0] a_i,
  input  signed [Width-1:0] b_i,
  output signed [Width-1:0] sum_o
);

  assign sum_o = a_i + b_i;

endmodule
adder_reg.v
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
module adder_reg #(
  parameter Width = 32
) (
  input                         rst_i,
  input                         clk_i,
  input      signed [Width-1:0] a_i,
  input      signed [Width-1:0] b_i,
  output reg signed [Width-1:0] sum_o
);

  wire [Width-1:0] sum_w;
  assign sum_w = a_i + b_i;

  always @(posedge clk_i, posedge rst_i) begin
    if (rst_i) begin 
      sum_o <= 0;
    end else begin
      sum_o <= sum_w;
    end
  end

endmodule

2. Verificación

adder_tb.v
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
`timescale 1ns / 100ps    
`include "adder.v"

module adder_tb #(
  parameter Width = 32 
) ();

  // Definición de señales de entrada y salida
  reg [Width-1:0] a;
  reg [Width-1:0] b;

  wire [Width-1:0] c;

  // Instanciacion del modulo
  adder #(Width) DUT (
    .a_i(a),
    .b_i(b),
    .sum_o(c)
  );

  // Abrir archivo de salida
  integer write_data;
  localparam SF = 2.0**-21.0;
  time t;

  // Estimulo de las entradas
  initial begin
    write_data = $fopen("adder_tb_output.txt","w");
    $dumpfile("adder_tb.vcd");
    $dumpvars(0,adder_tb);
    $timeformat(-9, 2, " ns", 10);
    a = 32'b00000000001000000000000000000000; //  1.0
    b = 32'b00000000001000000000000000000000; //  1.0;
    #100; t = $time;
    $fdisplay(write_data, "Tiempo: %t\ta = %10.7f\tb = %10.7f\tc = %10.7f",t,$itor(a)*SF,$itor(b)*SF,$itor(c)*SF);

    a = 32'b00000000001100000000000000000000; //  1.5
    b = 32'b00000000001100000000000000000000; //  1.5;
    #100; t = $time;
    $fdisplay(write_data, "Tiempo: %t\ta = %10.7f\tb = %10.7f\tc = %10.7f",t,$itor(a)*SF,$itor(b)*SF,$itor(c)*SF);

    a = 32'b00000000001100000000000000000000; //  1.5
    b = 32'b11111111111100000000000000000000; // -0.5;
    #100; t = $time;
    $fdisplay(write_data, "Tiempo: %t\ta = %10.7f\tb = %10.7f\tc = %10.7f",t,$itor(a)*SF,$itor(b)*SF,$itor(c)*SF);

    // Cerrar archivo de salida
    $fclose(write_data);

    // Final de simulacion
    $display("Test completed");
    //$display("a = %2d, b = %2d, result = %2d", a, b, c);  

  end

endmodule