clk_div.vhd

介绍了各种分频器的设计

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity clk_div is
	port(clk 		:	in std_logic;
		 clk_div5	:	out std_logic);
end clk_div;

ARCHITECTURE a of clk_div IS
	SIGNAL count : STD_LOGIC_vector(2 downto 0);
	
BEGIN
	process(clk)
		constant md:std_logic_vector(2 downto 0):="100";
	begin
		if clk'event and clk='1' then
			if count=md then 
				count<=(others=>'0');
				clk_div5<='1';
			else
				count<=count+1;
				clk_div5<='0';
			end if;
		end if;
	end process;
				
END a;