Subversion Repositories tinycpu

library ieee;

use ieee.std_logic_1164.all;

use IEEE.NUMERIC_STD.ALL;

entity bootrom is

port (CLK : in std_logic;

      EN : in std_logic;

      ADDR : in std_logic_vector(4 downto 0);

      DATA : out std_logic_vector(15 downto 0));

end bootrom;

architecture syn of bootrom is

  constant ROMSIZE: integer := 64;

  type ROM_TYPE is array(0 to ROMSIZE/2-1) of std_logic_vector(15 downto 0);

  signal ROM: ROM_TYPE := (x"0801", x"0a01", x"5853", x"0600", x"0402", x"5033", x"4020", x"3007", x"1701", x"3006", x"1700", x"0e16",

x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000", x"0000");

  signal rdata : std_logic_vector(15 downto 0);

begin

    rdata <= ROM(to_integer(unsigned(ADDR)));

    process (CLK)

    begin

        if (CLK'event and CLK = '1') then

            if (EN = '1') then

                DATA <= rdata;

            end if;

        end if;

    end process;

end syn;