led_toggle_bouncy.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

`timescale 1us/1ns

module led_toggle_bouncy_tb (
);

reg clk_i;
reg key_i;
wire [5:0] led;
integer i = 0;

led_toggle_bouncy uut(
  .clk_i(clk_i),
  .key_i(key_i),
  .led(led)
);

string filename;
initial begin
  clk_i <= 0;
  key_i <= 1'b1;

`ifdef DUMP_FILE_NAME
  filename=`DUMP_FILE_NAME;
`else
  filename="led_toggle_bouncy.lxt2";
`endif
  $dumpfile(filename); $dumpvars();
end

always #10 clk_i = ~clk_i;


initial begin
  // initial key press
  #25
  key_i <= ~key_i;
  #40
  key_i <= ~key_i;

  // try bouncing

  #50

  for (i=0; i < 20; i = i + 1) begin
    #20
    key_i <= ~key_i;
  end

  #105
  $finish();
end

endmodule