【文件属性】：
文件名称：vhdl按键消抖
文件大小：1KB
文件格式：QPF
更新时间：2016-05-30 13:21:55
vhdl
关于vhdl的消抖程序，
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity shift is
port(sin,cp:in std_logic;f:out std_logic);
end shift;
architecture netlist1 of shift is
component dff1
port(d,cp:in std_logic;q:out std_logic);
end component;
signal z:std_logic_vector(0 to 4);
begin
z(0)<=sin;
gf:for i in 0 to 3 generate
u1:dff1 port map(z(i),cp,z(i+1));
end generate;
f<=not(z(4) and (not z(1))and(not z(2))and(not z(3)));
end netlist1;
Library ieee;
use ieee.std_logic_1164.all;
entity dff1 is
port(d,cp:in std_logic;
q:out std_logic);
end dff1;
architecture one of dff1 is
begin
process(cp)
begin
if cp'event and cp='1'then
q<=d;
end if;
end process;
end one;