Subversion Repositories openrisc_2011-10-31

// ----------------------------------------------------------------------------
 
// TAP reset action : implementation
 
// Copyright (C) 2009  Embecosm Limited <info@embecosm.com>
 
// Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
 
// This file is part of the Embecosm cycle accurate SystemC JTAG library.
 
// This program 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 3 of the License, or (at your
// option) any later version.
 
// This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
 
// The C/C++ parts of this program are commented throughout in a fashion
// suitable for processing with Doxygen.
 
// ----------------------------------------------------------------------------
 
// $Id$
 
 
#include "TapActionReset.h"
 
 
//! Constructor
 
//! Records the SystemC completion event with the parent. Sets the ::firstTime
//! flag, so the ::process () method will mark the tapStateMachine as not
//! reset.
 
//! @param[in] _doneEvent  The SystemC completion event
 
TapActionReset::TapActionReset (sc_core::sc_event *_doneEvent) :
  TapAction (_doneEvent),
  firstTime (true)
{
 
}	// TapActionReset ()
 
 
//! Process the reset action
 
//! This reuses the parent class ::checkResetDone() method. The first time we
//! are called, we mark the state machine as being in an inconsistent state,
//! to force the reset.
 
//! We use the value of the TAP state machine's resetDone flag to trigger
//! completion, since this is set on the final reset cycle. The result from
//! ::checkResetDone () is only true on the first cycle AFTER reset.
 
//! @see TapAction::
 
//! @param[in]  tapStateMachine  The TAP state machine with which this action
//!                              is associated. 
//! @param[out] tdi              The value to drive on TDI
//! @param[in]  tdo              The value currently on TDO
//! @param[out] tms              The value to drive on TMS
 
//! @return  True if the action is complete
 
bool
TapActionReset::process (TapStateMachine *tapStateMachine,
			 bool            &tdi,
			 bool             tdo,
			 bool            &tms)
{
  if (firstTime)
    {
      tapStateMachine->setResetDone (false);
      firstTime = false;
    }
 
  // Parent does the work (no warning message). Our result draws on the value
  // set in the tapStateMachine, to avoid an extra cycle.
  checkResetDone (tapStateMachine, tms, false);
 
  return tapStateMachine->getResetDone ();
 
}	// process ()