Subversion Repositories mkjpeg

LIBRARY ieee, std;

USE ieee.std_logic_1164.ALL;

USE ieee.numeric_std.ALL;

use ieee.std_logic_textio.all;

use std.textio.all;

ENTITY HeaderRam IS

        GENERIC

        (

                ADDRESS_WIDTH   : integer := 10;

                DATA_WIDTH              : integer := 8

        );

        PORT

        (

                clk                             : IN  std_logic;

                d                               : IN  std_logic_vector(DATA_WIDTH - 1 DOWNTO 0);

                waddr                   : IN  std_logic_vector(ADDRESS_WIDTH - 1 DOWNTO 0);

                raddr                   : IN  std_logic_vector(ADDRESS_WIDTH - 1 DOWNTO 0);

                we                              : IN  std_logic;

                q                               : OUT std_logic_vector(DATA_WIDTH - 1 DOWNTO 0)

        );

END HeaderRam;

ARCHITECTURE rtl OF HeaderRam IS

TYPE RamType IS ARRAY(0 TO 2 ** ADDRESS_WIDTH - 1) OF std_logic_vector(DATA_WIDTH - 1 DOWNTO 0);

impure function InitRamFromFile(RamFileName : in string) return RamType is

        FILE RamFile : text is in RamFileName;

        variable RamFileLine : line;

        variable RAM : RamType;

begin

        for l in RamType'range loop

                readline(RamFile, RamFileLine);

                hread(RamFileLine, RAM(l));

        end loop;

        return RAM;

end function;

--SIGNAL ram_block : RamType := InitRamFromFile("../design/jfifgen/header.hex");

SIGNAL ram_block : RamType;

attribute ram_init_file : string;

attribute ram_init_file of ram_block :

signal is "./src/jpg/JFIFGen/header.mif";

BEGIN

        PROCESS (clk)

        BEGIN

                IF (clk'event AND clk = '1') THEN

                        IF (we = '1') THEN

                            ram_block(to_integer(unsigned(waddr))) <= d;

                        END IF;

                        q <= ram_block(to_integer(unsigned(raddr)));

                END IF;

        END PROCESS;

END rtl;