romdctb.vhd

用于视频运动图像编码的HUFFMAN编码

library ieee;
use ieee.std_logic_1164.all;
package ROMDC is
	--declare a 171*21 ROM called ROM
	constant ROM_WIDTH:integer:=21;
	subtype ROM_WORD is std_logic_vector(ROM_WIDTH-1 downto 0);
	subtype ROM_RENGE is integer range 0 to 191;
	type ROM_TABLE is array(0 to 11) of ROM_WORD;
	constant ROM:ROM_TABLE:=ROM_TABLE'(
		
		("000100000000000000000"),	-- DC0
		
		("000110100000000000000"),	-- DC1
		
		("000110110000000000000"),	-- DC2
		
		("000111000000000000000"),	-- DC3
		
		("000111010000000000000"),	-- DC4
		
		
		("000111100000000000000"),	--5/A DC5
		
		("001001110000000000000"),	--6/A DC6
	
		("001011111000000000000"),	--7/A DC7
		
		("001101111100000000000"),	--8/A DC8
	
		("001111111110000000000"),	--9/A DC9
		
		("010001111111000000000"),	--A/A DC10
		
		("010011111111100000000"));	--B/A DC11
		
end ROMDC;