-- Copyright (C) 2001 Bill Billowitch.

-- Some of the work to develop this test suite was done with Air Force
-- support.  The Air Force and Bill Billowitch assume no
-- responsibilities for this software.

-- 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: tc3155.vhd,v 1.2 2001-10-26 16:29:52 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------

ENTITY c05s03b00x00p01n01i03155ent IS
END c05s03b00x00p01n01i03155ent;

ARCHITECTURE c05s03b00x00p01n01i03155arch OF c05s03b00x00p01n01i03155ent IS

  -- Define resolution function for SIG:
  function RESFUNC( S : BIT_VECTOR ) return BIT is
  begin
    for I in S'RANGE loop
      if (S(I) = '1') then
        return '1';
      end if;
    end loop;
    return '0';
  end RESFUNC;
  
  -- Define the signal.
  subtype    RBIT    is RESFUNC BIT;
  signal       SIG    : RBIT bus;
  
  -- Define the disconnect specification.
  disconnect    SIG    : RBIT after 0 ns;
  
  -- Define the GUARD signal.
  signal    GUARD    : BOOLEAN := FALSE;
BEGIN
  -- Define the guarded signal assignment.
  L1: block( GUARD = TRUE )
  begin
    SIG <= guarded '1';
  end block L1;

  TESTING: PROCESS
    variable    pass : integer := 0;
  BEGIN

    -- 1. Turn on the GUARD, verify that SIG gets toggled.
    GUARD <= TRUE;
    wait on SIG;
    assert( SIG = '1' );
    if ( SIG = '1' ) then
      pass := pass + 1;
    end if;
    
    -- 2. Turn off the GUARD, verify that SIG gets turned OFF.
    GUARD <= FALSE;
    wait on SIG;
    assert( SIG = '0' );
    if ( SIG = '0' ) then
      pass := pass + 1;
    end if;

    wait for 50 ns; 
    assert NOT( pass = 2 )
      report "***PASSED TEST: c05s03b00x00p01n01i03155"
      severity NOTE;
    assert ( pass = 2 )
      report "***FAILED TEST: c05s03b00x00p01n01i03155 - Disconnect does not work properly."
      severity ERROR;
    wait;
  END PROCESS TESTING;

END c05s03b00x00p01n01i03155arch;