Subversion Repositories t48

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--

-- The testbench for t8039.

--

-- $Id: tb_t8039.vhd,v 1.1 2004-04-18 19:00:07 arniml Exp $

--

-- Copyright (c) 2004, 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/t48/

--

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library ieee;

use ieee.std_logic_1164.all;

entity tb_t8039 is

end tb_t8039;

use work.t48_core_comp_pack.syn_ram;

use work.t48_core_comp_pack.syn_rom;

use work.t48_tb_pack.all;

architecture behav of tb_t8039 is

  -- clock period, 11 MHz

  constant period_c : time := 90 ns;

  component t8039

    port (

      xtal_i    : in    std_logic;

      reset_n_i : in    std_logic;

      t0_b      : inout std_logic;

      int_n_i   : in    std_logic;

      ea_i      : in    std_logic;

      rd_n_o    : out   std_logic;

      psen_n_o  : out   std_logic;

      wr_n_o    : out   std_logic;

      ale_o     : out   std_logic;

      db_b      : inout std_logic_vector( 7 downto 0);

      t1_i      : in    std_logic;

      p2_b      : inout std_logic_vector( 7 downto 0);

      p1_b      : inout std_logic_vector( 7 downto 0);

      prog_n_o  : out   std_logic

    );

  end component;

  signal xtal_s          : std_logic;

  signal res_n_s         : std_logic;

  signal int_n_s         : std_logic;

  signal ale_s           : std_logic;

  signal psen_n_s        : std_logic;

  signal prog_n_s        : std_logic;

  signal rom_addr_s      : std_logic_vector(11 downto 0);

  signal rom_data_s      : std_logic_vector( 7 downto 0);

  signal ram_data_to_s   : std_logic_vector( 7 downto 0);

  signal ram_data_from_s : std_logic_vector( 7 downto 0);

  signal ram_addr_s      : std_logic_vector( 7 downto 0);

  signal ram_we_s        : std_logic;

  signal p1_b : std_logic_vector( 7 downto 0);

  signal p2_b : std_logic_vector( 7 downto 0);

  signal db_b                : std_logic_vector( 7 downto 0);

  signal ext_mem_addr_s      : std_logic_vector(11 downto 0);

  signal ext_ram_data_from_s : std_logic_vector( 7 downto 0);

  signal ext_ram_we_s        : std_logic;

  signal ext_rom_data_s      : std_logic_vector( 7 downto 0);

  signal rd_n_s              : std_logic;

  signal wr_n_s              : std_logic;

  signal zero_s          : std_logic;

  signal one_s           : std_logic;

begin

  zero_s <= '0';

  one_s  <= '1';

  p2_b   <= (others => 'H');

  p1_b   <= (others => 'H');

  ext_rom_b : syn_rom

    generic map (

      address_width_g => 12

    )

    port map (

      clk_i      => xtal_s,

      rom_addr_i => ext_mem_addr_s,

      rom_data_o => ext_rom_data_s

    );

  ext_ram_b : syn_ram

    generic map (

      address_width_g => 8

    )

    port map (

      clk_i      => zero_s,

      res_i      => res_n_s,

      ram_addr_i => ext_mem_addr_s(7 downto 0),

      ram_data_i => db_b,

      ram_we_i   => ext_ram_we_s,

      ram_data_o => ext_ram_data_from_s

    );

  t8039_b : t8039

    port map (

      xtal_i    => xtal_s,

      reset_n_i => res_n_s,

      t0_b      => p1_b(0),

      int_n_i   => int_n_s,

      ea_i      => one_s,

      rd_n_o    => rd_n_s,

      psen_n_o  => psen_n_s,

      wr_n_o    => wr_n_s,

      ale_o     => ale_s,

      db_b      => db_b,

      t1_i      => p1_b(1),

      p2_b      => p2_b,

      p1_b      => p1_b,

      prog_n_o  => prog_n_s

    );

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

  -- Read from external memory

  --

  db_b <=   ext_rom_data_s

          when psen_n_s = '0' else

            (others => 'Z');

  db_b <=   ext_ram_data_from_s

          when rd_n_s = '0' else

            (others => 'Z');

  --

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

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

  -- External memory access signals

  --

  ext_mem: process (wr_n_s,

                    ale_s,

                    p2_b,

                    db_b)

  begin

    ext_mem_addr_s(11 downto 8) <= p2_b(3 downto 0);

    if ale_s = '1' then

      if not is_X(db_b) then

        ext_mem_addr_s(7 downto 0) <= db_b;

      else

        ext_mem_addr_s(7 downto 0) <= (others => '0');

      end if;

    end if;

    if wr_n_s'event and wr_n_s = '1' then

      ext_ram_we_s <= '1';

    end if;

--    if clk_s'event then

--      ext_ram_we_s <= '0';

--    end if;

  end process ext_mem;

  --

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

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

  -- The clock generator

  --

  clk_gen: process

  begin

    xtal_s <= '0';

    wait for period_c/2;

    xtal_s <= '1';

    wait for period_c/2;

  end process clk_gen;

  --

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

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

  -- The reset generator

  --

  res_gen: process

  begin

    res_n_s <= '0';

    wait for 5 * period_c;

    res_n_s <= '1';

    wait;

  end process res_gen;

  --

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

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

  -- The interrupt generator

  --

  int_gen: process

  begin

    int_n_s <= '1';

    wait for 750 * period_c;

    int_n_s <= '0';

    wait for  45 * period_c;

  end process int_gen;

  --

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

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

  -- End of simulation detection

  --

  eos: process

  begin

    outer: loop

      wait on tb_accu_s;

      if tb_accu_s = "10101010" then

        wait on tb_accu_s;

        if tb_accu_s = "01010101" then

          wait on tb_accu_s;

          if tb_accu_s = "00000001" then

            -- wait for instruction strobe of this move

            wait until tb_istrobe_s'event and tb_istrobe_s = '1';

            -- wait for next strobe

            wait until tb_istrobe_s'event and tb_istrobe_s = '1';

            assert false

              report "Simulation Result: PASS."

              severity note;

          else

            assert false

              report "Simulation Result: FAIL."

              severity note;

          end if;

          assert false

            report "End of simulation reached."

            severity failure;

        end if;

      end if;

    end loop;

  end process eos;

  --

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

end behav;

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