dou.vhd

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------同步消除抖动模块 
library ieee; 
use ieee.std_logic_1164.all; 
-------------------------------
entity dou is 
port(din,clk:in std_logic; 
dout:out std_logic); 
end dou; 
----------------------------------
architecture dou_arc of dou is 
signal x,y:std_logic; 
begin 
process(clk) 
begin 
if clk'event and clk='1'then 
x<=din; 
y<=x; 
end if; 
dout<=x and(not y); ----din=‘1’超过一个时钟周期，x=1，y=1，dout=1
end process; 
end dou_arc;