rom generating code problem

Tricky,

Yes, you do. I wasn't sure if the constant array + synchronous read gets inferred but I just tested on Quartus 10 and it does.

So, simply replacing the

data_out <= .... 

with

process(clk) begin
if rising_edge(clk) then
if en = '1' then
	data_out <= rom_data(to_integer(unsigned(addr)));
end if;
end if;
end process;

Niveen,

no, I was talking about an "Intel HEX" file.

http://en.wikipedia.org/wiki/intel_hex

Quartus has a built-in editor which lets you write such a file by hand.

You'll also find a number of tools in the internet to write/convert data into that format.