Subversion Repositories gamepads

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

--

-- Testbench for the

-- GCpad controller core

--

-- $Id: tb.vhd,v 1.4 2004-10-10 20:19:49 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/gamepads/

--

-- The project homepage is located at:

--      http://www.opencores.org/projects.cgi/web/gamepads/overview

--

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

library ieee;

use ieee.std_logic_1164.all;

entity tb is

end tb;

use work.gcpad_pack.all;

use work.gcpad_comp.gcpad_basic;

use work.gcpad_comp.gcpad_full;

architecture behav of tb is

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

  -- Some known commands for the GC controller

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

  constant cmd_get_id_c : std_logic_vector(7 downto 0) := "00000000";

  constant cmd_poll_c   : std_logic_vector(7 downto 0) := "01000000";

  component gcpad_mod

    generic (

      clocks_per_1us_g :       natural := 2

    );

    port (

      clk_i            : in    std_logic;

      pad_data_io      : inout std_logic;

      rx_data_i        : in    std_logic_vector(63 downto 0)

    );

  end component;

  constant period_c         : time    := 100 ns;

  constant reset_level_c    : natural := 0;

  constant clocks_per_1us_c : natural := 10;

  signal clk_s   : std_logic;

  signal reset_s : std_logic;

  -- signals for basic gcpad

  signal stimuli_1_end_s    : boolean;

  signal pad_data_1_s       : std_logic;

  signal buttons_1_s        : std_logic_vector(64 downto 0);

  signal pad_request_1_s    : std_logic;

  signal pad_avail_1_s      : std_logic;

  signal pad_model_data_1_s : std_logic_vector(63 downto 0);

  -- signals for full gcpad

  signal stimuli_2_end_s    : boolean;

  signal pad_data_2_s       : std_logic;

  signal pad_request_2_s    : std_logic;

  signal pad_avail_2_s      : std_logic;

  signal pad_timeout_2_s    : std_logic;

  signal tx_size_2_s        : std_logic_vector( 1 downto 0);

  signal tx_command_2_s     : std_logic_vector(23 downto 0);

  signal rx_size_2_s        : std_logic_vector( 3 downto 0);

  signal rx_data_2_s        : std_logic_vector(63 downto 0);

  signal pad_model_data_2_s : std_logic_vector(63 downto 0);

begin

  basic_b : gcpad_basic

    generic map (

      reset_level_g    => reset_level_c,

      clocks_per_1us_g => clocks_per_1us_c

    )

    port map (

      clk_i          => clk_s,

      reset_i        => reset_s,

      pad_request_i  => pad_request_1_s,

      pad_avail_o    => pad_avail_1_s,

      pad_data_io    => pad_data_1_s,

      but_a_o        => buttons_1_s(56),

      but_b_o        => buttons_1_s(57),

      but_x_o        => buttons_1_s(58),

      but_y_o        => buttons_1_s(59),

      but_z_o        => buttons_1_s(52),

      but_start_o    => buttons_1_s(60),

      but_tl_o       => buttons_1_s(54),

      but_tr_o       => buttons_1_s(53),

      but_left_o     => buttons_1_s(48),

      but_right_o    => buttons_1_s(49),

      but_up_o       => buttons_1_s(51),

      but_down_o     => buttons_1_s(50),

      ana_joy_x_o    => buttons_1_s(47 downto 40),

      ana_joy_y_o    => buttons_1_s(39 downto 32),

      ana_c_x_o      => buttons_1_s(31 downto 24),

      ana_c_y_o      => buttons_1_s(23 downto 16),

      ana_l_o        => buttons_1_s(15 downto  8),

      ana_r_o        => buttons_1_s( 7 downto  0)

    );

  buttons_1_s(64)           <= '0';

  buttons_1_s(63 downto 61) <= (others => '0');

  buttons_1_s(55)           <= '1';

  full_b: gcpad_full

    generic map (

      reset_level_g    => reset_level_c,

      clocks_per_1us_g => clocks_per_1us_c

    )

    port map (

      clk_i            => clk_s,

      reset_i          => reset_s,

      pad_request_i    => pad_request_2_s,

      pad_avail_o      => pad_avail_2_s,

      pad_timeout_o    => pad_timeout_2_s,

      tx_size_i        => tx_size_2_s,

      tx_command_i     => tx_command_2_s,

      rx_size_i        => rx_size_2_s,

      rx_data_o        => rx_data_2_s,

      pad_data_io      => pad_data_2_s

    );

  pad_1 : gcpad_mod

    generic map (

      clocks_per_1us_g => clocks_per_1us_c

    )

    port map (

      clk_i            => clk_s,

      pad_data_io      => pad_data_1_s,

      rx_data_i        => pad_model_data_1_s

    );

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

  -- Process stimuli_pad_1

  --

  -- Executes test stimuli with Pad 1, the gcpad_basic flavour.

  --

  stimuli_pad_1: process

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

    -- Procedure poll_pad

    --

    -- Requests the status of Pad 1 and checks the received data.

    --

    procedure poll_pad(packet : in std_logic_vector(63 downto 0)) is

    begin

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

      wait for 1 ns;

      pad_model_data_1_s <= packet;

      -- send request;

      pad_request_1_s <= '1';

      wait for 1 * period_c;

      pad_request_1_s <= '0';

      wait for 10 * 40 * period_c;

      wait until pad_avail_1_s = '1';

      wait for 10 * period_c;

      -- check result

      for i in 0 to packet'high loop

        assert packet(i) = buttons_1_s(i)

          report "Button mismatch on Pad 1!"

          severity error;

      end loop;

    end poll_pad;

    --

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

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

    -- Procedure timeout_gcpad

    --

    -- Generates a timeout in gcpad_basic by disturbing the communication.

    --

    procedure timeout_gcpad is

    begin

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

      wait for 1 ns;

      -- send request;

      pad_request_1_s <= '1';

      wait for 1 * period_c;

      pad_request_1_s <= '0';

      wait for 2 * period_c;

      -- disturb communication

      pad_data_1_s <= 'X';

      wait until pad_avail_1_s = '1';

      wait for 10 * period_c;

      pad_data_1_s <= 'H';

      wait for 10 * period_c;

    end timeout_gcpad;

    --

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

  begin

    stimuli_1_end_s <= false;

    pad_data_1_s       <= 'H';

    pad_request_1_s    <= '0';

    pad_model_data_1_s <= (others => '0');

    wait until reset_s = '1';

    wait for period_c * 4;

    timeout_gcpad;

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000000000");

    wait for clocks_per_1us_c * 100 * period_c;

    poll_pad(packet => "0001111111111111111111111111111111111111111111111111111111111111");

    poll_pad(packet => "0001000010000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000100010000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000010010000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000001010000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000110000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000101010101010101010101010101010101010101010101010101010101010");

    poll_pad(packet => "0001010111010101010101010101010101010101010101010101010101010101");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000011000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010100000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010010000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010001000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000100000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000010000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000001000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000100000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000010000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000001000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000100000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000010000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000001000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000100000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000010000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000001000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000100000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000010000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000001000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000100000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000010000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000001000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000100000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000010000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000001000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000100000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000010000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000001000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000100000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000010000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000001000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000100000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000010000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000001000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000100000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000010000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000001000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000100000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000010000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000001000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000100000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000010000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000001000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000100000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000010000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000001000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000100000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000010000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000001000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000100000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000010000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000001000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000000100");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000000010");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000000001");

    wait for period_c * 2*40;

    stimuli_1_end_s <= true;

    wait;

  end process stimuli_pad_1;

  --

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

  pad_2 : gcpad_mod

    generic map (

      clocks_per_1us_g => clocks_per_1us_c

    )

    port map (

      clk_i            => clk_s,

      pad_data_io      => pad_data_2_s,

      rx_data_i        => pad_model_data_2_s

    );

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

  -- Process stimuli_pad_2

  --

  -- Executes test stimuli with Pad 2, the gcpad_full flavour.

  --

  stimuli_pad_2: process

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

    -- Procedure issue_command

    --

    -- Sets the transmitter command for Pad 2 and starts the request.

    --

    procedure issue_command(cmd  : in std_logic_vector(23 downto 0);

                            size : in std_logic_vector( 1 downto 0)) is

    begin

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

      wait for 1 ns;

      tx_command_2_s  <= cmd;

      tx_size_2_s     <= size;

      -- send request;

      pad_request_2_s <= '1';

      wait for 1 * period_c;

      pad_request_2_s <= '0';

    end issue_command;

    --

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

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

    -- Procedure poll_pad

    --

    -- Requests the status of Pad 2 and checks the received data.

    --

    procedure poll_pad(packet : in std_logic_vector(63 downto 0)) is

      variable cmd_v : std_logic_vector(23 downto 0);

    begin

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

      wait for 1 ns;

      -- set up model answer

      pad_model_data_2_s <= packet;

      -- set expected number of bytes for gcpad_full

      rx_size_2_s        <= "1000";

      cmd_v(23 downto 16) := cmd_poll_c;

      cmd_v(15 downto  0) := "0000001100000010";

      issue_command(cmd  => cmd_v,

                    size => "11");

      wait until pad_avail_2_s = '1';

      assert pad_timeout_2_s = '0'

        report "Timout signalled on Pad 2 during status polling!"

        severity error;

      -- check result

      for i in 0 to packet'high loop

        assert packet(i) = rx_data_2_s(i)

          report "Data mismatch on Pad 2!"

          severity error;

      end loop;

    end poll_pad;

    --

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

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

    -- Procedure timeout_gcpad_x

    --

    -- Generates a timeout in gcpad_full by disturbing the communication.

    --

    procedure timeout_gcpad_x is

      variable cmd_v : std_logic_vector(23 downto 0);

    begin

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

      wait for 1 ns;

      pad_model_data_2_s <= (others => '0');

      rx_size_2_s        <= "1000";

      cmd_v(23 downto 16) := cmd_poll_c;

      cmd_v(15 downto  0) := "0000001100000010";

      issue_command(cmd  => cmd_v,

                    size => "11");

      -- disturb communication

      pad_data_2_s <= 'X';

      wait until pad_avail_1_s = '1';

      wait for 10 * period_c;

      pad_data_2_s <= 'H';

      wait for 10 * period_c;

      assert pad_timeout_2_s = '1'

        report "No timeout indicated on Pad 2 when communication has been disturbed!"

        severity error;

    end timeout_gcpad_x;

    --

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

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

    -- Procedure timeout_gcpad_short

    --

    -- Generates a timeout in gcpad_full by requesting too many bytes for

    -- a "get id" command.

    --

    procedure timeout_gcpad_short is

      variable cmd_v : std_logic_vector(23 downto 0);

    begin

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

      wait for 1 ns;

      -- expect too many number of bytes

      -- command is "get id", will yield 3 bytes, but 8 bytes are requested

      rx_size_2_s        <= "1000";

      cmd_v(23 downto 16) := cmd_get_id_c;

      cmd_v(15 downto  0) := (others => '1');

      issue_command(cmd  => cmd_v,

                    size => "01");

      wait until pad_avail_2_s = '1';

      assert pad_timeout_2_s = '1'

        report "No timout indicated on Pad 2 when too many bytes requested!"

        severity error;

    end timeout_gcpad_short;

    --

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

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

    -- Procedure get_id

    --

    -- Requests the ID information from the GC controller model.

    --

    procedure get_id is

      variable cmd_v : std_logic_vector(23 downto 0);

      constant id_c  : std_logic_vector(23 downto 0) := "000010010000000000000000";

    begin

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

      wait for 1 ns;

      rx_size_2_s        <= "0011";

      cmd_v(23 downto 16) := cmd_get_id_c;

      cmd_v(15 downto  0) := (others => '1');

      issue_command(cmd  => cmd_v,

                    size => "01");

      wait until pad_avail_2_s = '1';

      assert pad_timeout_2_s = '0'

        report "Timout signalled on Pad 2 during get id!"

        severity error;

      -- check result

      for i in 0 to id_c'high loop

        assert id_c(i) = rx_data_2_s(i)

          report "ID mismatch on Pad 2!"

          severity error;

      end loop;

    end get_id;

    --

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

begin

    stimuli_2_end_s <= false;

    pad_data_2_s       <= 'H';

    pad_request_2_s    <= '0';

    tx_size_2_s        <= (others => '0');

    tx_command_2_s     <= (others => '0');

    rx_size_2_s        <= (others => '0');

    pad_model_data_2_s <= (others => '0');

    wait until reset_s = '1';

    wait for period_c * 4;

    get_id;

    timeout_gcpad_x;

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000000000");

    wait for clocks_per_1us_c * 100 * period_c;

    poll_pad(packet => "0001111111111111111111111111111111111111111111111111111111111111");

    timeout_gcpad_short;

    poll_pad(packet => "0001000010000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000100010000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000010010000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000001010000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000110000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000101010101010101010101010101010101010101010101010101010101010");

    poll_pad(packet => "0001010111010101010101010101010101010101010101010101010101010101");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000011000000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010100000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010010000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010001000000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000100000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000010000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000001000000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000100000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000010000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000001000000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000100000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000010000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000001000000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000100000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000010000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000001000000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000100000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000010000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000001000000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000100000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000010000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000001000000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000100000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000010000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000001000000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000100000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000010000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000001000000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000100000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000010000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000001000000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000100000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000010000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000001000000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000100000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000010000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000001000000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000100000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000010000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000001000000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000100000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000010000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000001000000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000100000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000010000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000001000000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000100000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000010000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000001000000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000100000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000010000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000001000");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000000100");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000000010");

    poll_pad(packet => "0000000010000000000000000000000000000000000000000000000000000001");

    wait for period_c * 2*40;

    stimuli_2_end_s <= true;

    wait;

  end process stimuli_pad_2;

  --

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

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

  -- Clock Generator

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

  clk: process

  begin

    clk_s <= '0';

    wait for period_c / 2;

    clk_s <= '1';

    wait for period_c / 2;

  end process clk;

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

  -- Reset Generator

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

  reset: process

  begin

    if reset_level_c = 0 then

      reset_s <= '0';

    else

      reset_s <= '1';

    end if;

    wait for period_c * 4 + 10 ns;

    reset_s <= not reset_s;

    wait;

  end process reset;

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

  -- End of simulation detection

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

  eos: process (stimuli_1_end_s, stimuli_2_end_s)

  begin

    if stimuli_1_end_s and stimuli_2_end_s then

      assert false

        report "End of simulation reached."

        severity failure;

    end if;

  end process eos;

end behav;