Subversion Repositories pltbutils

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

----                                                              ----

---- PlTbUtils Testbench                                          ----

----                                                              ----

---- This file is part of the PlTbUtils project                   ----

---- http://opencores.org/project,pltbutils                       ----

----                                                              ----

---- Description                                                  ----

---- PlTbUtils is a collection of functions, procedures and       ----

---- components for easily creating stimuli and checking response ----

---- in automatic self-checking testbenches.                      ----

----                                                              ----

---- This is a testbench file, which is used to verify            ----

---- - pltbutils_func_pkg                                         ----

---- - pltbutils_comp                                           ----

---- This testbench is NOT selfchecking or automatic.             ----

---- Manually check the transcript and waveform, when simulating. ----

---- It prints some informative text in the transcript, to help   ----

---- with the manual inspection.                                  ----

----                                                              ----

----                                                              ----

---- To Do:                                                       ----

---- -                                                            ----

----                                                              ----

---- Author(s):                                                   ----

---- - Per Larsson, pela.opencores@gmail.com                      ----

----                                                              ----

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

----                                                              ----

---- Copyright (C) 2013-2014 Authors and OPENCORES.ORG            ----

----                                                              ----

---- This source file may be used and distributed without         ----

---- restriction provided that this copyright statement is not    ----

---- removed from the file and that any derivative work contains  ----

---- the original copyright notice and the associated disclaimer. ----

----                                                              ----

---- This source file is free software; you can redistribute it   ----

---- and/or modify it under the terms of the GNU Lesser General   ----

---- Public License as published by the Free Software Foundation; ----

---- either version 2.1 of the License, or (at your option) any   ----

---- later version.                                               ----

----                                                              ----

---- This source 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 Lesser General Public License for more  ----

---- details.                                                     ----

----                                                              ----

---- You should have received a copy of the GNU Lesser General    ----

---- Public License along with this source; if not, download it   ----

---- from http://www.opencores.org/lgpl.shtml                     ----

----                                                              ----

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

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use std.textio.all;

use work.txt_util.all;

use work.pltbutils_func_pkg.all;

use work.pltbutils_comp_pkg.all;

entity tb_pltbutils is

  generic (

    G_SKIPTESTS   : std_logic_vector := (

                      '0', -- Dummy

                      '0', -- Test 1

                      '0', -- Test 2

                      '0', -- Test 3

                      '0', -- Test 4: NonSkipTest 

                      '1'  -- Test 5: SkipTest

                    );

    G_CLK_PERIOD  : time := 10 ns

  );

end entity tb_pltbutils;

architecture bhv of tb_pltbutils is

  -- Simulation status- and control signals

  -- for accessing .stop_sim and for viewing in waveform window

  signal pltbs          : pltbs_t := C_PLTBS_INIT;

  -- Expected number of checks and number of errors to be reported

  -- by pltbutils. The counting is made by variables, but the

  -- variables are copied to these signals for easier viewing in

  -- the simulator's waveform window.

  signal expected_checks_cnt : integer := 0;

  signal expected_errors_cnt : integer := 0;

  -- DUT stimuli and response signals

  signal clk            : std_logic;

  signal clk_cnt        : integer := 0;

  signal clk_cnt_clr    : boolean := false;

  signal s_i            : integer;

  signal s_sl           : std_logic;

  signal s_slv          : std_logic_vector(7 downto 0);

  signal s_u            : unsigned(7 downto 0);

  signal s_s            : unsigned(7 downto 0);

  signal s_b            : boolean;

  signal s_time         : time;

  signal s_str_exp      : string(1 to 44);

  signal s_str1         : string(1 to 44);

  signal s_str2         : string(1 to 44);

  signal s_str3         : string(1 to 43);

  signal s_str4         : string(1 to 45);

begin

  -- Clock generator

  clkgen0 : pltbutils_clkgen

    generic map(

      G_PERIOD      => G_CLK_PERIOD

    )

    port map(

      clk_o         => clk,

      stop_sim_i    => pltbs.stop_sim

    );

  -- Clock cycle counter

  p_clk_cnt : process (clk_cnt_clr, clk)

  begin

    if clk_cnt_clr then

      clk_cnt <= 0;

    elsif rising_edge(clk) then

      clk_cnt <= clk_cnt + 1;

    end if;

  end process p_clk_cnt;

  -- Testcase

  p_tc1 : process

    variable pltbv                 : pltbv_t := C_PLTBV_INIT;

    variable v_expected_tests_cnt  : integer := 0;

    variable v_expected_skiptests_cnt : integer := 0;

    variable v_expected_checks_cnt : integer := 0;

    variable v_expected_errors_cnt : integer := 0;

  begin

    print("<Testing startsim()>");

    startsim("tc1", G_SKIPTESTS, pltbv, pltbs);

    wait until rising_edge(clk);

    assert (pltbv.test_num = 0) and (pltbs.test_num  = 0)

      report "test_num after startsim() incorrect"

      severity error;

    print("<Done testing startsim()>");

    print("<Testing starttest() with auto-incrementing test_num>");

    starttest("StartTest1", pltbv, pltbs);

    v_expected_tests_cnt := v_expected_tests_cnt + 1;

    wait until rising_edge(clk);

    assert (pltbv.test_num = 1) and (pltbs.test_num  = 1)

      report "test_num after starttest() incorrect"

      severity error;

    print("<Done testing starttest() with auto-incrementing test_num()>");

    print("<Testing endtest()>");

    endtest(pltbv, pltbs);

    print("<Done testing endtest()>");

    print("<Testing starttest() with explicit test_num>");

    starttest(3, "StartTest2", pltbv, pltbs);

    v_expected_tests_cnt := v_expected_tests_cnt + 1;

    wait until rising_edge(clk);

    assert (pltbv.test_num = 3) and (pltbs.test_num  = 3)

      report "test_num after startsim() incorrect"

      severity error;

    print("<Done testing starttest() with explicit test_num>");

    print("<Testing starttest() and is_test_active() for non-skipped test>");

    starttest(4, "NoSkipTest", pltbv, pltbs);

    if is_test_active(pltbv) then

      v_expected_tests_cnt := v_expected_tests_cnt + 1;

      wait until rising_edge(clk);

    else

      v_expected_skiptests_cnt := v_expected_skiptests_cnt + 1;

      wait until rising_edge(clk);

      assert false

        report "Executing test that should have been skipped"

        severity error;

    end if;

    endtest(pltbv, pltbs);

    print("<Done testing starttest() and is_test_active() for non-skipped test>");

    print("<Testing starttest() and is_test_active() for skipped test>");

    starttest(5, "SkipTest", pltbv, pltbs);

    if is_test_active(pltbv) then

      v_expected_tests_cnt := v_expected_tests_cnt + 1;

      wait until rising_edge(clk);

      assert false

        report "Executing test that should have been skipped"

        severity error;

    else

      --check("Checking if check() detects that it should not be called in skipped test", false, pltbv, pltbs);

      v_expected_skiptests_cnt := v_expected_skiptests_cnt + 1;

    end if;

    endtest(pltbv, pltbs);

    print("<Done testing starttest() and is_test_active() for skipped test>");

    print("<Testing waitclks()>");

    clk_cnt_clr <= true;

    wait until rising_edge(clk);

    clk_cnt_clr <= false;

    wait until rising_edge(clk);

    waitclks(10, clk, pltbv, pltbs);

    assert clk_cnt = 10

      report "clk_cnt after waitclks() incorrect:" & integer'image(clk_cnt) &

             " expected:" & integer'image(10)

      severity error;

    print("<Done testing waitclks()>");

    print("<Testing check() integer>");

    s_i <= 0;

    wait until rising_edge(clk);

    check("Testing correct integer = 0", s_i, 0, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_i <= 1;

    wait until rising_edge(clk);

    check("Testing correct integer = 1", s_i, 1, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_i <= 17;

    wait until rising_edge(clk);

    check("Testing incorrect integer = 17", s_i, 18, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    s_i <= -1;

    wait until rising_edge(clk);

    check("Testing negative integer = -1", s_i, -1, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    print("<Done testing check() integer>");

    print("<Testing check() std_logic>");

    s_sl <= '0';

    wait until rising_edge(clk);

    check("Testing correct std_logic = '0'", s_sl, '0', pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_sl <= '1';

    wait until rising_edge(clk);

    check("Testing correct std_logic = '1'", s_sl, '1', pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_sl <= 'X';

    wait until rising_edge(clk);

    check("Testing incorrect std_logic = '1'", s_sl, '1', pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() std_logic>");

    print("<Testing check() std_logic against integer>");

    s_sl <= '0';

    wait until rising_edge(clk);

    check("Testing correct std_logic = '0'", s_sl, 0, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_sl <= '1';

    wait until rising_edge(clk);

    check("Testing correct std_logic = '1'", s_sl, 1, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_sl <= 'X';

    wait until rising_edge(clk);

    check("Testing incorrect std_logic = '1'", s_sl, 1, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    s_sl <= '1';

    wait until rising_edge(clk);

    check("Testing std_logic = '1' with incorrect expected", s_sl, 2, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() std_logic against integer>");

    print("<Testing check() std_logic_vector>");

    s_slv <= x"00";

    wait until rising_edge(clk);

    check("Testing correct std_logic_vector = x'00'", s_slv, x"00", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_slv <= x"47";

    wait until rising_edge(clk);

    check("Testing correct std_logic_vector = x'47'", s_slv, x"47", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_slv <= x"11";

    wait until rising_edge(clk);

    check("Testing incorrect std_logic_vector = x'11'", s_slv, x"10", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() std_logic_vector>");

    print("<Testing check() std_logic_vector with mask>");

    s_slv <= x"47";

    wait until rising_edge(clk);

    check("Testing std_logic_vector = x'47' with correct nibble mask", s_slv, x"57", x"0F", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_slv <= x"47";

    wait until rising_edge(clk);

    check("Testing std_logic_vector = x'47' with incorrect nibble mask", s_slv, x"57", x"F0", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() std_logic_vector with mask>");

    print("<Testing check() std_logic_vector against integer>");

    s_slv <= x"00";

    wait until rising_edge(clk);

    check("Testing correct std_logic_vector = x'00'", s_slv, 0, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_slv <= x"47";

    wait until rising_edge(clk);

    check("Testing correct std_logic_vector = x'47'", s_slv, 16#47#, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_slv <= x"11";

    wait until rising_edge(clk);

    check("Testing incorrect std_logic_vector = x'11'", s_slv, 16#10#, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    s_slv <= x"FF";

    wait until rising_edge(clk);

    check("Testing negative std_logic_vector = x'FF'", s_slv, -1, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    print("<Done testing check() std_logic_vector against integer>");

    print("<Testing check() std_logic_vector with mask against integer>");

    s_slv <= x"47";

    wait until rising_edge(clk);

    check("Testing std_logic_vector = x'47' with correct nibble mask", s_slv, 16#57#, x"0F", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_slv <= x"47";

    wait until rising_edge(clk);

    check("Testing std_logic_vector = x'47' with incorrect nibble mask", s_slv, 16#57#, x"F0", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() std_logic_vector with mask against integer>");

    print("<Testing check() unsigned>");

    s_u <= x"00";

    wait until rising_edge(clk);

    check("Testing correct unsigned = x'00'", s_u, x"00", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_u <= x"47";

    wait until rising_edge(clk);

    check("Testing correct unsigned = x'47'", s_u, x"47", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_u <= x"11";

    wait until rising_edge(clk);

    check("Testing incorrect unsigned = x'11'", s_u, x"10", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() unsigned>");

    print("<Testing check() unsigned against integer>");

    s_u <= x"00";

    wait until rising_edge(clk);

    check("Testing correct unsigned = x'00'", s_u, 0, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_u <= x"47";

    wait until rising_edge(clk);

    check("Testing correct unsigned = x'47'", s_u, 16#47#, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_u <= x"11";

    wait until rising_edge(clk);

    check("Testing incorrect unsigned = x'11'", s_u, 16#10#, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() unsigned against integer>");

    print("<Testing check() signed>");

    s_s <= x"00";

    wait until rising_edge(clk);

    check("Testing correct signed = x'00'", s_s, x"00", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_s <= x"47";

    wait until rising_edge(clk);

    check("Testing correct signed = x'47'", s_s, x"47", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_s <= x"11";

    wait until rising_edge(clk);

    check("Testing incorrect signed = x'11'", s_s, x"10", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    s_s <= x"FF";

    wait until rising_edge(clk);

    check("Testing negative signed = x'FF'", s_s, x"FF", pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    print("<Done testing check() signed>");

    print("<Testing check() signed against integer>");

    s_s <= x"00";

    wait until rising_edge(clk);

    check("Testing correct signed = x'00'", s_s, 0, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_s <= x"47";

    wait until rising_edge(clk);

    check("Testing correct signed = x'47'", s_s, 16#47#, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_s <= x"11";

    wait until rising_edge(clk);

    check("Testing incorrect signed = x'11'", s_s, 16#10#, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    s_s <= x"FF";

    wait until rising_edge(clk);

    print("NOTE: Skipping test with negative signed. There seem to be a bug in ModelSim.");

    --print("The following check fails in ModelSim for unknown reason." &

    --      " It causes mismatch between expected number of errors" &

    --      " and the number presented by endsim()");

    --check("Testing negative signed = x'FF'", s_s, -1, pltbv, pltbs);

    --v_expected_checks_cnt := v_expected_checks_cnt + 1;    

    --expected_checks_cnt   <= v_expected_checks_cnt;

    print("<Done testing check() signed against integer>");

    print("<Testing check() boolean>");

    s_b <= false;

    wait until rising_edge(clk);

    check("Testing correct boolean = false", s_b, false, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_b <= true;

    wait until rising_edge(clk);

    check("Testing correct boolean = true", s_b, true, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_b <= false;

    wait until rising_edge(clk);

    check("Testing incorrect boolean = true", s_b, true, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() boolean>");

    print("<Testing check() boolean against integer>");

    s_b <= false;

    wait until rising_edge(clk);

    check("Testing correct boolean = false", s_b, 0, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_b <= true;

    wait until rising_edge(clk);

    check("Testing correct boolean = true", s_b, 1, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_b <= false;

    wait until rising_edge(clk);

    check("Testing incorrect boolean = true", s_b, 1, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    s_b <= true;

    wait until rising_edge(clk);

    check("Testing boolean = true with incorrect expected", s_b, 2, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() boolean against integer>");

    print("<Testing check() time>");

    s_time <= 0 sec;

    wait until rising_edge(clk);

    check("Testing correct time = 0 sec", s_time, 0 sec, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_time <= 47 ns;

    wait until rising_edge(clk);

    check("Testing correct time = 47 ns", s_time, 47 ns, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_time <= 11 us;

    wait until rising_edge(clk);

    check("Testing incorrect time = 10 us", s_time, 10 us, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() time>");

    print("<Testing check() time with tolerance>");

    s_time <= 0 sec;

    wait until rising_edge(clk);

    check("Testing correct unsigned = 0 sec +/- 0 sec", s_time, 0 sec, 0 sec, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_time <= 47 ns - 3 ns;

    wait until rising_edge(clk);

    check("Testing correct time = 47 ns +/- 5 ns", s_time, 47 ns, 5 ns, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_time <= 10 us + 7 us;

    wait until rising_edge(clk);

    check("Testing incorrect time = 10 us +/- 5 us", s_time, 10 us, 5 us, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() time with tolerance>");

    print("<Testing check() string>");

    s_str_exp   <= string'("The quick brown fox jumps over the lazy dog.");

    s_str1      <= string'("The quick brown fox jumps over the lazy dog.");

    s_str2      <= string'("The quick brown dog jumps over the lazy fox.");

    s_str3      <= string'("The quick brown fox jumps over the lazy dog");

    s_str4      <= string'("The quick brown fox jumps over the lazy dog..");

    wait until rising_edge(clk);

    check("Testing correct string", s_str1, s_str_exp, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_s <= x"47";

    wait until rising_edge(clk);

    check("Testing incorrect string with correct length", s_str2, s_str_exp, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    s_s <= x"11";

    wait until rising_edge(clk);

    check("Testing too short string", s_str3, s_str_exp, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    wait until rising_edge(clk);

    check("Testing too long string", s_str4, s_str_exp, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() string>");

    print("<Testing check() boolean expression>");

    s_i <= 0;

    wait until rising_edge(clk);

    check("Testing correct boolean expression 0 = 16#00#", s_i = 16#00#, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    s_i <= 47;

    wait until rising_edge(clk);

    check("Testing incorrect boolean expression 47 < 16#10#", s_i < 16#10#, pltbv, pltbs);

    v_expected_checks_cnt := v_expected_checks_cnt + 1;

    expected_checks_cnt   <= v_expected_checks_cnt;

    v_expected_errors_cnt := v_expected_errors_cnt + 1;

    expected_errors_cnt   <= v_expected_errors_cnt;

    print("<Done testing check() boolean expresson>");

    print("<Testing endtest()>");

    endtest(pltbv, pltbs);

    print("<Done testing endtest()>");

    wait until rising_edge(clk);

    print("<Testing endsim()>");

    print("");

    print("Expected number of tests:         " & str(v_expected_tests_cnt));

    print("Expected number of skipped tests: " & str(v_expected_skiptests_cnt));

    print("Expected number of checks:        " & str(v_expected_checks_cnt));

    print("Expected number of errors:        " & str(v_expected_errors_cnt));

    if v_expected_errors_cnt = 0 then

      print("Expected result:           SUCCESS");

    else

      print("Expected result:           FAIL");

    end if;

    wait until rising_edge(clk);

    endsim(pltbv, pltbs, true);

    wait until rising_edge(clk);

    print("<Done testing endsim()>");

    wait;

  end process p_tc1;

end architecture bhv;