blob: 0ea40d1a561e8b2bdf111c1b23f779a8551c0c92 (
plain)
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
|
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity debounce is
generic (
N_CYCLES: integer := 255
);
port
(
clk: in std_ulogic;
reset_n: in std_ulogic;
debounce_in: in std_ulogic;
debounced_out: buffer std_ulogic
);
end debounce;
architecture rtl of debounce is
signal counter: integer range 0 to N_CYCLES;
signal previous_debounce_in: std_ulogic := '0';
begin
process(clk, reset_n)
begin
if (reset_n = '0') then
previous_debounce_in <= '0';
debounced_out <= '0';
counter <= 0;
elsif rising_edge(clk) then
if debounce_in = previous_debounce_in then
if counter = N_CYCLES then
debounced_out <= debounce_in;
else
counter <= counter + 1;
end if;
else
counter <= 0;
end if;
previous_debounce_in <= debounce_in;
end if;
end process;
end rtl;
|
