Subversion Repositories scarts

-----------------------------------------------------------------------
-- This file is part of SCARTS.
-- 
-- SCARTS is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
-- 
-- SCARTS is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.
-- 
-- You should have received a copy of the GNU General Public License
-- along with SCARTS.  If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
 
 
library ieee;
use ieee.std_logic_1164.all; 
use ieee.numeric_std.all;
 
use work.scarts_core_pkg.all;
use work.scarts_pkg.all;
 
entity scarts_brom is
  generic (
    CONF : scarts_conf_type);                
  port (
    clk   : in  std_ulogic;
    hold  : in  std_ulogic;
    addr  : in  std_logic_vector(CONF.word_size-1 downto 0);
    data  : out INSTR);
end scarts_brom;
 
architecture behaviour of scarts_brom is
 
signal enable : std_ulogic;
signal data_int  :  INSTR;
 
begin
 
  enable <= not hold;
 
--  xilinx_gen : if (CONF.tech = XILINX) generate
 --   instr_rom_inst: xilinx_instr_rom
 --     port map (
 --       clk     => clk,
 --       enable  => enable,
 --       addr    => addr(15 downto 0),
 --      data    => data_int
 --     );
 -- end generate;
 
  altera_gen : if (CONF.tech = ALTERA) generate
    boot_rom_inst: altera_boot_rom
      generic map (
        CONF => CONF)
      port map (
        address => addr(15 downto 0),
        clken   => enable,
        clock   => clk,
        q       => data_int
      );
  end generate;
 
 
  -- little-endianness used for storing instructions in memory
  -- => swap bytes
  data(15 downto 8) <= data_int(7 downto 0);
  data(7 downto 0) <= data_int(15 downto 8);
 
end behaviour;