rom.vhd

来自「2ask调制与解调包含顶层文件」· VHDL 代码 · 共 29 行

--	Package File Template
--
--	Purpose: This package defines supplemental types, subtypes, 
--		 constants, and functions 


library IEEE;
use IEEE.STD_LOGIC_1164.all;

package rom is
       constant rom_width: integer :=8;
       constant rom_length: integer :=64;
	         subtype rom_word is  integer  range -255 to 255;
	  type rom_table is array (0 to rom_length-1) of rom_word;
	  constant rom : rom_table := ( 255,254,252,	249,	245,	239,	233,	225,	
                                     217,207,197,	186,	174,	162,	150,	137,	
                                     124,112	,99,	87,	75,	64,	53,	43,	
                                     34, 26,	19,	13,	8,	4,	1,	0,	
                                     0,	 1,	4,	8,	13,	19,	26,	34,	
                                     43, 53,	64,	75,	87,	99,	112,	124,	
                                     137,150,162,	174,	186,	197,	207,	217,	
                                     225,233,239,	245,	249,	252,	254,	255
);	
 	  end;