Xilinx - file io error for a small rom

[tanukichu]

hi all!
I hope you can help me with this bug xilinx is giving me

i'm trying to load 8 bits words from a file and store them in a variable, creating a classic rom

however Xilinx ISE webPack 9.2 is printing out
ERROR:Xst:1914 - "rom.vhd" line32: File <rom_file> does not exist.
but the file exists, and it's in the same folder of all vhd files!

can you give me a hand?
here's the code:

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use ieee.std_logic_textio.all;
use std.textio.all;

entity ROM is
generic (		N_DATA	: natural := 32;
			N_ROWS	: natural := 48;
			N_COLS	: natural := 8 );
port( 	rst			: in   std_logic;
		address		: in   STD_LOGIC_VECTOR (N_DATA-1 downto 0);
		Instruction	: out STD_LOGIC_VECTOR (N_DATA-1 downto 0)
);
end ROM;

architecture Behav32 of ROM is
type Rom_Array is array (0 to N_ROWS-1) of std_logic_vector(N_COLS-1 downto 0);

signal content : Rom_Array;
begin

FILL_IN_MEM: process (rst,address)
	file rom_file : TEXT open READ_MODE is "rom.txt";
	variable file_line	: line;
	variable index		: integer := 0;
	variable data_tmp	: std_logic_vector (N_COLS-1 downto 0);
	begin
		if rst = '1' then
			--file_open(rom_file,"rom.txt",READ_MODE);
			while (not endfile(rom_file)) loop
				readline(rom_file,file_line);
				hread(file_line,data_tmp);
				content(index) <= data_tmp;
				index := index + 1;
			end loop;
		else
			index := to_integer(unsigned(address));
			Instruction <= content(index) & content(index+1) & content(index+2) & content(index+3);
		end if;
	end process;

end Behav32;

thanks a lot for any possible help!
TanukiChu

 

[tanukichu]

no possible solutions???

 

[jeppe]

First of all - you comment out this line:
--file_open(rom_file,"rom.txt",READ_MODE);

Second - the rom.txt file must exist - properly at C:\ or D:\

Jeppe