www.pudn.com > DDS.rar > ROM.vhd

--ROM.VHD 
LIBRARY IEEE; 
USE IEEE.STD_LOGIC_1164.ALL; 
USE IEEE.STD_LOGIC_ARITH.ALL; 
USE IEEE.STD_LOGIC_UNSIGNED.ALL; 
ENTITY ROM IS 
  PORT(ADDR: IN STD_LOGIC_VECTOR(9 DOWNTO 0); 
       CLK: IN STD_LOGIC; 
       OUTP: OUT SIGNED(8 DOWNTO 0)); 
END ENTITY ROM; 
ARCHITECTURE ART OF ROM IS 
BEGIN 
PROCESS (CLK) IS 
BEGIN 
IF (CLK'EVENT AND CLK='1')THEN 
CASE ADDR IS 
WHEN "0000000000"=>OUTP<="000000000"; 
WHEN "0000000001"=>OUTP<="000000010"; 
WHEN "0000000010"=>OUTP<="000000011"; 
WHEN "0000000011"=>OUTP<="000000101"; 
WHEN "0000000100"=>OUTP<="000000110"; 
WHEN "0000000101"=>OUTP<="000001000"; 
WHEN "0000000110"=>OUTP<="000001001"; 
WHEN "0000000111"=>OUTP<="000001011"; 
WHEN "0000001000"=>OUTP<="000001101"; 
WHEN "0000001001"=>OUTP<="000001110"; 
WHEN "0000001010"=>OUTP<="000010000"; 
WHEN "1111101001"=>OUTP<="111011100"; 
WHEN "1111101010"=>OUTP<="111011110"; 
WHEN "1111101011"=>OUTP<="111011111"; 
WHEN "1111101100"=>OUTP<="111100001"; 
WHEN "1111101101"=>OUTP<="111100010"; 
WHEN "1111101110"=>OUTP<="111100100"; 
WHEN "1111101111"=>OUTP<="111100101"; 
WHEN "1111110000"=>OUTP<="111100111"; 
WHEN "1111110001"=>OUTP<="111101001"; 
WHEN "1111110010"=>OUTP<="111101010"; 
WHEN "1111110011"=>OUTP<="111101100"; 
WHEN "1111110100"=>OUTP<="111101101"; 
WHEN "1111110101"=>OUTP<="111101111"; 
WHEN "1111110110"=>OUTP<="111110000"; 
WHEN "1111110111"=>OUTP<="111110010"; 
WHEN "1111111000"=>OUTP<="111110011"; 
WHEN "1111111001"=>OUTP<="111110101"; 
WHEN "1111111010"=>OUTP<="111110111"; 
WHEN "1111111011"=>OUTP<="111111010"; 
WHEN "1111111100"=>OUTP<="111111011"; 
WHEN "1111111101"=>OUTP<="111111101"; 
WHEN "1111111110"=>OUTP<="111111110"; 
WHEN "1111111111"=>OUTP<="000000000"; 
WHEN OTHERS=>OUTP<="000000000"; 
END CASE; 
END IF; 
END PROCESS; 
END ARCHITECTURE ART;