frq.vhd

来自「用于视频运动图像编码的HUFFMAN编码」· VHDL 代码 · 共 36 行

---------      电子系                 学号：J02301                姓名：张宗旺----
library ieee;
	use ieee.std_logic_1164.all;
	use ieee.std_logic_unsigned.all;
	use ieee.std_logic_arith.all;

entity FRQ_DIV is
	port(	RST:		in std_logic;
		CLK: 		in std_logic;
		OUT_CLK: 	out std_logic	);
end FRQ_DIV;

architecture ALG of FRQ_DIV is



begin
	process(CLK,RST)
	variable COUNTER:integer range 0 to 20000000;
	begin 
		if RST='0' then 
			OUT_CLK<='0';
		else	
			if CLK'event and CLK='1' then
				if COUNTER=19999999 then					
					OUT_CLK<='1';
					COUNTER:=0;
				else						
					COUNTER:=COUNTER+1;						
					OUT_CLK<='0';
				end if;
			end if;
		end if;
	end process;
end ALG;