romdc.vhd

来自「用于视频运动图像编码的HUFFMAN编码」· VHDL 代码 · 共 25 行

library ieee;
use ieee.std_logic_1164.all;
use work.romdc.all;
use work.MYfunction.all;

entity ROM_DC is
	port(	ADDR:in std_logic_vector(7 downto 0);
		RD,CS:in std_logic;
		DATA:out std_logic_vector(20 downto 0));
end ROM_DC;

architecture BEHAVIOR of ROM_DC is
	
	
begin
	output:process(ADDR,RD)
	begin
		if RD='1' and CS='1' then
			DATA<=ROM(vector_int(ADDR));
		else
			DATA<=(others=>'Z');
		end if;
	end process output;
end BEHAVIOR;