s16.vhd

来自「用于视频运动图像编码的HUFFMAN编码」· VHDL 代码 · 共 44 行

library ieee;
	use ieee.std_logic_1164.all;
	use ieee.std_logic_unsigned.all;
	use ieee.std_logic_arith.all;
	
	
entity SHIFTER_OUT_16 is
	
	port(	CLK:	in 	std_logic;
		RESET,LOAD:in std_logic;
		DIN:	in 	std_logic_vector(15 downto 0);
		DOUT:	out 	std_logic			);
end SHIFTER_OUT_16;

architecture BEHAVIORAL of SHIFTER_OUT_16 is
	signal Q:std_logic_vector(15 downto 0);
	signal P:std_logic;
begin
	DOUT<=P;
		
	BEHAVIOR: process(RESET,CLK)
	begin
		if RESET= '0' then
			Q<="0000000000000000";
			
		elsif CLK'event and CLK='1' then
			if LOAD='0' then
				P<=Q(15);
				for INDEX IN 14 downto 0 loop
					Q(INDEX+1)<=Q(INDEX);
				end loop;
				Q(0)<='0';
			elsif LOAD='1' then
				Q<=DIN; 
			end if;
		end if;
		
	end process BEHAVIOR;
	
end BEHAVIORAL;