Subversion Repositories t400

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

--

-- T421 system toplevel.

--

-- $Id: t421.vhd 179 2009-04-01 19:48:38Z arniml $

--

-- Copyright (c) 2006 Arnim Laeuger (arniml@opencores.org)

--

-- All rights reserved

--

-- Redistribution and use in source and synthezised forms, with or without

-- modification, are permitted provided that the following conditions are met:

--

-- Redistributions of source code must retain the above copyright notice,

-- this list of conditions and the following disclaimer.

--

-- Redistributions in synthesized form must reproduce the above copyright

-- notice, this list of conditions and the following disclaimer in the

-- documentation and/or other materials provided with the distribution.

--

-- Neither the name of the author nor the names of other contributors may

-- be used to endorse or promote products derived from this software without

-- specific prior written permission.

--

-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE

-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

-- POSSIBILITY OF SUCH DAMAGE.

--

-- Please report bugs to the author, but before you do so, please

-- make sure that this is not a derivative work and that

-- you have the latest version of this file.

--

-- The latest version of this file can be found at:

--      http://www.opencores.org/cvsweb.shtml/t400/

--

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

library ieee;

use ieee.std_logic_1164.all;

use work.t400_opt_pack.all;

entity t421 is

  generic (

    opt_ck_div_g         : integer := t400_opt_ck_div_8_c;

    opt_cko_g            : integer := t400_opt_cko_crystal_c;

    opt_l_out_type_7_g   : integer := t400_opt_out_type_std_c;

    opt_l_out_type_6_g   : integer := t400_opt_out_type_std_c;

    opt_l_out_type_5_g   : integer := t400_opt_out_type_std_c;

    opt_l_out_type_4_g   : integer := t400_opt_out_type_std_c;

    opt_l_out_type_3_g   : integer := t400_opt_out_type_std_c;

    opt_l_out_type_2_g   : integer := t400_opt_out_type_std_c;

    opt_l_out_type_1_g   : integer := t400_opt_out_type_std_c;

    opt_l_out_type_0_g   : integer := t400_opt_out_type_std_c;

    opt_d_out_type_3_g   : integer := t400_opt_out_type_std_c;

    opt_d_out_type_2_g   : integer := t400_opt_out_type_std_c;

    opt_d_out_type_1_g   : integer := t400_opt_out_type_std_c;

    opt_d_out_type_0_g   : integer := t400_opt_out_type_std_c;

    opt_g_out_type_3_g   : integer := t400_opt_out_type_std_c;

    opt_g_out_type_2_g   : integer := t400_opt_out_type_std_c;

    opt_g_out_type_1_g   : integer := t400_opt_out_type_std_c;

    opt_g_out_type_0_g   : integer := t400_opt_out_type_std_c;

    opt_so_output_type_g : integer := t400_opt_out_type_std_c;

    opt_sk_output_type_g : integer := t400_opt_out_type_std_c

  );

  port (

    ck_i      : in    std_logic;

    ck_en_i   : in    std_logic;

    reset_n_i : in    std_logic;

    cko_i     : in    std_logic;

    io_l_b    : inout std_logic_vector(7 downto 0);

    io_d_o    : out   std_logic_vector(3 downto 0);

    io_g_b    : inout std_logic_vector(3 downto 0);

    si_i      : in    std_logic;

    so_o      : out   std_logic;

    sk_o      : out   std_logic

  );

end t421;

use work.t400_system_comp_pack.t420_notri;

architecture struct of t421 is

  signal io_l_from_t420_s,

         io_l_en_s         : std_logic_vector(7 downto 0);

  signal io_d_from_t420_s,

         io_d_en_s         : std_logic_vector(3 downto 0);

  signal io_g_from_t420_s,

         io_g_en_s         : std_logic_vector(3 downto 0);

  signal so_s,

         so_en_s           : std_logic;

  signal sk_s,

         sk_en_s           : std_logic;

  signal vdd4_s            : std_logic_vector(3 downto 0);

begin

  vdd4_s <= (others => '1');

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

  -- T420 without tri-states in T421 configuration

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

  t420_notri_b : t420_notri

    generic map (

      opt_type_g           => t400_opt_type_421_c,

      opt_ck_div_g         => opt_ck_div_g,

      opt_cko_g            => opt_cko_g,

      opt_l_out_type_7_g   => opt_l_out_type_7_g,

      opt_l_out_type_6_g   => opt_l_out_type_6_g,

      opt_l_out_type_5_g   => opt_l_out_type_5_g,

      opt_l_out_type_4_g   => opt_l_out_type_4_g,

      opt_l_out_type_3_g   => opt_l_out_type_3_g,

      opt_l_out_type_2_g   => opt_l_out_type_2_g,

      opt_l_out_type_1_g   => opt_l_out_type_1_g,

      opt_l_out_type_0_g   => opt_l_out_type_0_g,

      opt_microbus_g       => t400_opt_no_microbus_c,

      opt_d_out_type_3_g   => opt_d_out_type_3_g,

      opt_d_out_type_2_g   => opt_d_out_type_2_g,

      opt_d_out_type_1_g   => opt_d_out_type_1_g,

      opt_d_out_type_0_g   => opt_d_out_type_0_g,

      opt_g_out_type_3_g   => opt_g_out_type_3_g,

      opt_g_out_type_2_g   => opt_g_out_type_2_g,

      opt_g_out_type_1_g   => opt_g_out_type_1_g,

      opt_g_out_type_0_g   => opt_g_out_type_0_g,

      opt_so_output_type_g => opt_so_output_type_g,

      opt_sk_output_type_g => opt_sk_output_type_g

    )

    port map (

      ck_i      => ck_i,

      ck_en_i   => ck_en_i,

      reset_n_i => reset_n_i,

      cko_i     => cko_i,

      io_l_i    => io_l_b,

      io_l_o    => io_l_from_t420_s,

      io_l_en_o => io_l_en_s,

      io_d_o    => io_d_from_t420_s,

      io_d_en_o => io_d_en_s,

      io_g_i    => io_g_b,

      io_g_o    => io_g_from_t420_s,

      io_g_en_o => io_g_en_s,

      io_in_i   => vdd4_s,

      si_i      => si_i,

      so_o      => so_s,

      so_en_o   => so_en_s,

      sk_o      => sk_s,

      sk_en_o   => sk_en_s

    );

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

  -- Tri-states for output drivers

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

  io_l_tri: for idx in 7 downto 0 generate

    io_l_b(idx)  <=   io_l_from_t420_s(idx)

                    when io_l_en_s(idx) = '1' else

                      'Z';

  end generate;

  --

  io_d_tri: for idx in 3 downto 0 generate

    io_d_o(idx)  <=   io_d_from_t420_s(idx)

                    when io_d_en_s(idx) = '1' else

                      'Z';

  end generate;

  --

  io_g_tri: for idx in 3 downto 0 generate

    io_g_b(idx)  <=   io_g_from_t420_s(idx)

                    when io_g_en_s(idx) = '1' else

                      'Z';

  end generate;

  --

  so_o           <=   so_s

                    when so_en_s = '1' else

                      'Z';

  --

  sk_o           <=   sk_s

                    when sk_en_s = '1' else

                      'Z';

end struct;