--
-- Program memory ROM implemented using a case statement. 
-- Its content was generated by the uCore cross compiler.

LIBRARY IEEE;
USE     IEEE.STD_LOGIC_1164.ALL;
USE     IEEE.STD_LOGIC_UNSIGNED.ALL;
USE     work.constants.ALL;

ENTITY boot_rom IS
PORT (addr  : IN   boot_addr;
      data  : OUT  inst_bus);
END boot_rom;

ARCHITECTURE sim_model OF boot_rom IS

SUBTYPE rom_address IS NATURAL RANGE 0 TO 2**boot_addr_width-1;

FUNCTION program(addr : rom_address) RETURN STD_LOGIC_VECTOR IS
BEGIN
   CASE addr IS
      WHEN 16#0000# => RETURN "11111110";
      WHEN 16#0001# => RETURN "00001000";
      WHEN 16#0002# => RETURN "00000111";
      WHEN OTHERS   => RETURN "--------";
   END CASE;
END program;

BEGIN

data <= program(conv_integer(addr));

END sim_model;