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;