f_word_gen.vhd

用DE2板子实现的正选信号发生器,需安装quartus2软件,硬件需要DE2的开发板

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;

entity key_delay is
port(clk,reset:in std_logic;
     fre_word:out std_logic_vector(31 downto 0));
end key_delay;

architecture rtl of key_delay is
begin

process(keyclk)
begin
    if(keyclk'event and keyclk='0')then
       key1<=key0;
	   key0<=key;
    end if;
end process;

process(key0,key1)
begin
    key_en<=keyclk and key0 and (not key1);
end process;

end rtl;