EDA流水灯

EDA流水灯

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

entity light is

port(clk1: in std_logic;

light: buffer std_logic_vector(7 downto 0));

end light;

architecture behv of light11 is

constant len: integer:=7;

signal banner: std_logic:='0';

signal clk,clk2: std_logic;

begin

-- clk<=(clk1 and banner) or (clk2 and not banner);

process(clk1)

begin

if clk1'event and clk1='1' then

clk2<=not clk2 ;

end if;

end process;

-- process(clk1,clk2,banner)

process(clk)

variable flag: bit_vector(3 downto 0):="0000";

begin

clk<=(clk1 and banner) or (clk2 and not banner);

if clk'event and clk='1' then

if flag="0000" then

light<="11111111";

flag:="0001";

elsif flag="0001" then light<="00000000"; flag:="0010";

elsif flag="0010" then light<="11111111";

flag:="0011";

elsif flag="0011" then light<="00000000";

flag:="0100";

elsif flag="0100" then light<="00000001" ;

flag:="0101";

elsif flag="0101" then light<="00000100"; flag:="0110";

elsif flag="0110" then light<="00010000"; flag:="0111";

elsif flag="0111" then light<="01000000";

flag:="1000";

elsif flag="1000" then light<="01010101";

flag:="1001";

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