suocunqi4_m.vhd

4位电子智能密码锁

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-- suocunqi4_m.vhd          用于锁存预置密码( _m: memory)
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity suocunqi4_m is
	port( key_in : in std_logic_vector(3 downto 0);       ---shu ru
             rst : in std_logic ;                         ---fu wei  
              cs : in std_logic ;                         ---pian xuan
              oe : in std_logic ;                         ---shu chu yu xu
         key_out : out std_logic_vector(3 downto 0) );    ---shu chu
end ;

architecture one of suocunqi4_m is
begin
--***
process(RST,CS,OE)
  begin
  if rst='1' then key_out <= "1111";
     elsif cs='1' then 
           if oe='1' and oe'event then key_out <= key_in; end if;
end if;
end process;
end;
--***
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