CristalCaveGem » LustreC » Lustrec-Tests

-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc

-- This file is part of VESTs (Vhdl tESTs).

-- VESTs 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. 

-- VESTs 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 VESTs; if not, write to the Free Software Foundation,

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

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

--

-- $Id: ap_a_fg_a_06.vhd,v 1.1.1.1 2001-08-22 18:20:47 paw Exp $

-- $Revision: 1.1.1.1 $

--

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

entity fg_a_06 is

end entity fg_a_06;

library ieee;  use ieee.std_logic_1164.all;

architecture test of fg_a_06 is

  -- code from book

  constant terminal_count : integer := 2**6 - 1;

  subtype counter_range is integer range 0 to terminal_count;

  signal count : counter_range;

  -- . . .

  -- end code from book

  signal clk, reset : std_ulogic;

begin

  -- code from book

  counter6 : process (reset, clk)

  begin

    if reset = '0' then

      count <= 0;

    elsif rising_edge(clk) then

      if count < terminal_count then

        count <= count + 1;

      else

        count <= 0;

      end if;

    end if;

  end process counter6;

  -- end code from book

  stimulus : process is

  begin

    reset <= '1';  clk <= '0';  wait for 10 ns;

    clk <= '1', '0' after 10 ns;  wait for 20 ns;

    clk <= '1', '0' after 10 ns;  wait for 20 ns;

    clk <= '1', '0' after 10 ns;  wait for 20 ns;

    reset <= '0', '1' after 30 ns;

    clk <= '1' after 10 ns, '0' after 20 ns;

    wait for 40 ns;

    for i in 1 to terminal_count + 10 loop

      clk <= '1', '0' after 10 ns;

      wait for 20 ns;

    end loop;

    wait;

  end process stimulus;

end architecture test;