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: ch_16_ch_16_02.vhd,v 1.1.1.1 2001-08-22 18:20:48 paw Exp $

-- $Revision: 1.1.1.1 $

--

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

entity ch_16_02 is

end entity ch_16_02;

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

architecture test of ch_16_02 is

  -- code from book:

  subtype word is bit_vector(0 to 31);

  type word_array is array (integer range <>) of word;

  function resolve_words ( words : word_array ) return word;

  signal s : resolve_words word bus;

  -- end of code from book

  function resolve_words ( words : word_array ) return word is

  begin

    if words'length > 0 then

      return words(words'left);

    else

      return X"00000000";

    end if;

  end function resolve_words;

  constant T_delay : delay_length := 2 ns;

begin

  process is

  begin

    -- code from book (should fail)

    s(0 to 15) <= X"003F" after T_delay;

    s(16 to 31) <= null after T_delay;

    -- end of code from book

    wait;

  end process;

end architecture test;