division.vhd

矩阵键盘的扫描的vhdl代码

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
---------------------------------------------------------------
entity division is
	generic (data : integer:=3);
	port(clk_in : in std_logic;
		 clk_out : out std_logic);
end entity division;
--------------------------------------------------------------
architecture div1 of division is
	signal clk_outQ : std_logic ;
	signal coutQ : integer;
	begin
process(clk_in)
	begin
	if clk_in'event and clk_in='1' then 
		if coutQ /= (data/2 - 1) then 
			coutQ <= coutQ + 1;
		else clk_outQ <= not clk_outQ;
			 coutQ <= 0;
			end if;
	end if;
	end process;
clk_out <= clk_outQ;
end architecture div1;