mc8051_rom_sim.vhd

This is version 1.5 of the MC8051 IP core.

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--                                                                           --
--  MC8051 - VHDL 8051 Microcontroller IP Core                               --
--  Copyright (C) 2001 OREGANO SYSTEMS                                       --
--                                                                           --
--  This library is free software; you can redistribute it and/or            --
--  modify it under the terms of the GNU Lesser General Public               --
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--  Lesser General Public License for more details.                          --
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-------------------------------------------------------------------------------
--
--
--         Author:                 Helmut Mayrhofer
--
--         Filename:               mc8051_rom_sim.vhd
--
--         Date of Creation:       Mon Aug  9 12:14:48 1999
--
--         Version:                $Revision: 1.2 $
--
--         Date of Latest Version: $Date: 2002/01/07 12:16:57 $
--
--
--         Description: The mc8051 ROM model.
--
--
--
--
-------------------------------------------------------------------------------
architecture sim of mc8051_rom is

   type   rom_type is array (65535 downto 0) of bit_vector(7 downto 0); 
   signal s_init : boolean := false;

begin

------------------------------------------------------------------------------ 
-- rom_read 
------------------------------------------------------------------------------ 
 
  p_read : process (clk, reset, rom_adr_i)
      variable v_loop : integer;    
      variable v_line : line;
      variable v_rom_data : rom_type;
      file f_initfile : text is in c_init_file;
  begin
    if (not s_init) then
      v_loop := 0;
      while ((not endfile(f_initfile) and (v_loop < 65535))) loop
        readline(f_initfile,v_line);
        read(v_line,v_rom_data(v_loop));
        v_loop := v_loop + 1;        
      end loop;
      s_init <= true;
    end if;
    if (clk'event and (clk = '1')) then  -- rising clock edge
      rom_data_o <= to_stdlogicvector(v_rom_data(conv_integer(unsigned(rom_adr_i))));
    end if;
  end process p_read; 

end sim;