any_even.vhd

很实用的一个分频带码

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

entity any_even is
	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 entity any_even;
	
architecture div1 of any_even is
	signal clk_outQ : std_logic ;
	signal coutQ : std_logic_vector (data_width - 1 downto 0);
	begin
-------------------------------------------------
	--process(clk_in)
		--begin
		--if clk_in'event and clk_in = '1' then 
			--if (coutQ < (conv_integer(input1) - 1)) then
				--coutQ <= coutQ + 1;
			--else coutQ <= (others => '0');
			--end if;
		--end if;			
	--end process;
---------------------------------------------------
	--process(coutQ)
		--begin
		--if coutQ < (conv_integer(input1))/2 then
			--clk_outQ <= '0';
		--else clk_outQ <= '1';
		--end if;
	--end process;
	process(clk_in)
	begin
	if clk_in'event and clk_in='1' then 
		if coutQ /= ((conv_integer(input1))/2 - 1) then 
			coutQ <= coutQ + 1;
		else clk_outQ <= not clk_outQ;
			 coutQ <=(others =>'0');
			end if;
	end if;
	end process;
clk_out <= clk_outQ;
end architecture div1;