fen.vhd

来自「这个是我毕业设计的最初方案 8位二进制密码锁」· VHDL 代码 · 共 22 行

library ieee;
use ieee.std_logic_1164.all;
entity fen is
  port(clk:in std_logic;
       clk1:out std_logic);
end fen;
architecture fen_arc of fen is 
begin 
  process(clk)
  variable cnt:integer range 0 to 9999;
  begin 
    if clk'event and clk='1' then
      if cnt=9999 then 
        cnt:=0;
        clk1<='1';
      else
        cnt:=cnt+1;
        clk1<='0';
      end if;
    end if;
  end process;
end fen_arc;