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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use ieee.numeric_std_unsigned.all;
use std.textio.all;
package rom is
generic (
word_bits: positive;
address_bits: positive;
rom_filename: string
);
subtype word_type is std_logic_vector(word_bits-1 downto 0);
impure function read_at(address: in integer range 0 to 2**address_bits-1) return word_type;
end package rom;
package body rom is
impure function read_at(
address: in integer range 0 to 2**address_bits-1
) return word_type is
type rom_type is array(0 to 2**address_bits-1) of word_type;
impure function init_rom_from_file (filename: in string) return rom_type is
file rom_file: text;
variable file_line : line;
variable rom_array: rom_type;
begin
file_open(rom_file, filename, read_mode);
for i in rom_type'range loop
readline(rom_file, file_line);
read(file_line, rom_array(i));
end loop;
file_close(rom_file);
return rom_array;
end function;
constant rom_array: rom_type := init_rom_from_file(rom_filename);
begin
return rom_array(address);
end function read_at;
end package body rom;
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use ieee.numeric_std_unsigned.all;
use std.textio.all;
entity test is
end test;
architecture dataflow of test is
package p is new work.rom generic map(
word_bits => 2,
address_bits => 2,
rom_filename => "rom.txt"
);
signal word: std_logic_vector(1 downto 0);
begin
process (all)
begin
word <= p.read_at(0);
end process;
end dataflow;
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