moshibianhuan.vhd

消抖程序

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity moshibianhuan is
--产生各种模式标志位
  port
	(  mode     : in   std_logic:='0';
	  flag0     : out  std_logic:='1';  --计价模式
      flag1     : out  std_logic:='0';  --调价模式
      flag2     : out  std_logic:='0'   --调时模式    

        );
end entity;
architecture arc of moshibianhuan is
signal count  :std_logic_vector (1 downto 0);
begin

process(mode) is
variable count1 :std_logic_vector (1 downto 0);
begin
if(mode'event and mode='1')then
      if(count1="10")then count1:="00";
       else
       count1:=count1+1;
       end if;
end if;
count<=count1;
end process;

process(count) is
begin
case count is
           when "00" =>flag0<='1';flag1<='0';flag2<='0';
           when "01" =>flag0<='0';flag1<='1';flag2<='0';
           when "10" =>flag0<='0';flag1<='0';flag2<='1';
           when others=> null;
end case;
end process;


end arc;