Subversion Repositories mips_enhanced

------------------------------------------------------------------------------

--  This file is a part of the GRLIB VHDL IP LIBRARY

--  Copyright (C) 2003, Gaisler Research

--

--  This program 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 2 of the License, or

--  (at your option) any later version.

--

--  This program 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 this program; if not, write to the Free Software

--  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

-----------------------------------------------------------------------------

-- Entity:      iodpad

-- File:        iodpad.vhd

-- Author:      Jiri Gaisler - Gaisler Research

-- Description: Open-drain I/O pad with technology wrapper

------------------------------------------------------------------------------

library ieee;

library techmap;

use ieee.std_logic_1164.all;

use techmap.gencomp.all;

use techmap.allpads.all;

entity iodpad is

  generic (tech : integer := 0; level : integer := 0; slew : integer := 0;

           voltage : integer := x33v; strength : integer := 12;

           oepol : integer := 0);

  port (pad : inout std_ulogic; i : in std_ulogic; o : out std_ulogic);

end;

architecture rtl of iodpad is

signal gnd, oen : std_ulogic;

begin

  oen <= not i when oepol /= padoen_polarity(tech) else i;

  gnd <= '0';

  gen0 : if has_pads(tech) = 0 generate

    pad <= '0' after 2 ns when oen = '0'

-- pragma translate_off

           else 'X' after 2 ns when is_x(i)

-- pragma translate_on

           else 'Z' after 2 ns;

    o <= to_X01(pad) after 1 ns;

  end generate;

  xcv : if (tech = virtex) or (tech = virtex2) or (tech = spartan3)

        or (tech = spartan3e) or (tech = virtex4) or (tech = virtex5)

  generate

    x0 : virtex_iopad generic map (level, slew, voltage, strength)

         port map (pad, gnd, oen, o);

  end generate;

  axc : if (tech = axcel) or (tech = proasic) or (tech = apa3) generate

    x0 : axcel_iopad generic map (level, slew, voltage, strength)

         port map (pad, gnd, oen, o);

  end generate;

  atc : if (tech = atc18s) generate

    x0 : atc18_iopad generic map (level, slew, voltage, strength)

         port map (pad, gnd, oen, o);

  end generate;

  atcrh : if (tech = atc18rha) generate

    x0 : atc18rha_iopad generic map (level, slew, voltage, strength)

         port map (pad, gnd, oen, o);

  end generate;

  um : if (tech = umc) generate

    x0 : umc_iopad generic map (level, slew, voltage, strength)

         port map (pad, gnd, oen, o);

  end generate;

  rhu : if (tech = rhumc) generate

    x0 : rhumc_iopad generic map (level, slew, voltage, strength)

         port map (pad, gnd, oen, o);

  end generate;

  ihp : if (tech = ihp25) generate

    x0 : ihp25_iopad generic map (level, slew, voltage, strength)

         port map (pad, gnd, oen, o);

    end generate;

  rh18t : if (tech = rhlib18t) generate

    x0 : rh_lib18t_iopad generic map (strength)

         port map (pad, gnd, oen, o);

    end generate;

  ut025 : if (tech = ut25) generate

    x0 : ut025crh_iopad generic map (strength)

         port map (pad, gnd, oen, o);

    end generate;

  pere  : if (tech = peregrine) generate

    x0 : peregrine_iopad generic map (level, slew, voltage, strength)

         port map(pad, gnd, oen, o);

  end generate;

end;

library ieee;

library techmap;

use ieee.std_logic_1164.all;

use techmap.gencomp.all;

entity iodpadv is

  generic (tech : integer := 0; level : integer := 0; slew : integer := 0;

        voltage : integer := 0; strength : integer := 0; width : integer := 1;

        oepol : integer := 0);

  port (

    pad : inout std_logic_vector(width-1 downto 0);

    i   : in  std_logic_vector(width-1 downto 0);

    o   : out std_logic_vector(width-1 downto 0));

end;

architecture rtl of iodpadv is

begin

  v : for j in width-1 downto 0 generate

    x0 : iodpad generic map (tech, level, slew, voltage, strength, oepol)

         port map (pad(j), i(j), o(j));

  end generate;

end;