division.vhd

很实用的一个分频带码

------the top file of the design division
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity division is 
	port (input : in std_logic_vector(7 downto 0);
		 clk :  in std_logic;
		 clk_out : out std_logic;
		 clk_com : out std_logic;
		 led1: out std_logic_vector(6 downto 0);
		 led2: out std_logic_vector(6 downto 0);
		 led3: out std_logic_vector(6 downto 0));
end entity division;
--------------------------------------------------

architecture freq of division is
 component decoder is----decoder
	port(bin : in std_logic_vector(2 downto 0);
		 de : out std_logic_vector(6 downto 0));
 end component;
 component any_even is----any_even division
	generic (data_width : integer := 8 );
	port(input1 : in std_logic_vector(data_width-1 downto 0);
		 clk_in : in std_logic;
		 clk_out : out std_logic);
 end component any_even;
 component any_odd is-----any_even division
 generic (data_width : integer := 8);
port(input2 : in std_logic_vector(data_width - 1 downto 0);
	 clk_in : in std_logic;
	 clk_out : out std_logic);
 end component any_odd;
	signal temp1,temp2 : std_logic;
	begin
u1: decoder port map(bin=>input(2)&input(1)&input(0),de=>led1);
u2: decoder port map(bin=>input(5)&input(4)&input(3),de=>led2);
u3: decoder port map(bin=>'0'&input(7)&input(6),de=>led3);
u4: any_even port map(input,clk,temp1);
U5: any_odd  port map(input,clk,temp2);
process(clk,input)
  begin
	if input(0)= '0' then 
		clk_out <= temp1;
	else clk_out <= temp2;
	end if;
	end process;
clk_com <= clk;
end architecture freq;