// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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// TAP reset action : implementation
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// TAP reset action : implementation
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// Copyright (C) 2009 Embecosm Limited <info@embecosm.com>
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// Copyright (C) 2009 Embecosm Limited <info@embecosm.com>
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// Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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// Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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// This file is part of the Embecosm cycle accurate SystemC JTAG library.
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// This file is part of the Embecosm cycle accurate SystemC JTAG library.
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// This program is free software: you can redistribute it and/or modify it
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published by
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// under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or (at your
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// the Free Software Foundation, either version 3 of the License, or (at your
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// option) any later version.
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// option) any later version.
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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// License for more details.
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// License for more details.
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// You should have received a copy of the GNU Lesser General Public License
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// The C/C++ parts of this program are commented throughout in a fashion
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// The C/C++ parts of this program are commented throughout in a fashion
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// suitable for processing with Doxygen.
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// suitable for processing with Doxygen.
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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// $Id$
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// $Id$
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#include "TapActionReset.h"
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#include "TapActionReset.h"
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//! Constructor
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//! Constructor
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//! Records the SystemC completion event with the parent. Sets the ::firstTime
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//! Records the SystemC completion event with the parent. Sets the ::firstTime
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//! flag, so the ::process () method will mark the tapStateMachine as not
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//! flag, so the ::process () method will mark the tapStateMachine as not
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//! reset.
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//! reset.
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//! @param[in] _doneEvent The SystemC completion event
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//! @param[in] _doneEvent The SystemC completion event
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TapActionReset::TapActionReset (sc_core::sc_event *_doneEvent) :
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TapActionReset::TapActionReset (sc_core::sc_event *_doneEvent) :
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TapAction (_doneEvent),
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TapAction(_doneEvent), firstTime(true)
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firstTime (true)
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{
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{
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} // TapActionReset ()
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} // TapActionReset ()
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//! Process the reset action
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//! Process the reset action
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//! This reuses the parent class ::checkResetDone() method. The first time we
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//! This reuses the parent class ::checkResetDone() method. The first time we
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//! are called, we mark the state machine as being in an inconsistent state,
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//! are called, we mark the state machine as being in an inconsistent state,
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//! to force the reset.
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//! to force the reset.
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//! We use the value of the TAP state machine's resetDone flag to trigger
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//! We use the value of the TAP state machine's resetDone flag to trigger
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//! completion, since this is set on the final reset cycle. The result from
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//! completion, since this is set on the final reset cycle. The result from
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//! ::checkResetDone () is only true on the first cycle AFTER reset.
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//! ::checkResetDone () is only true on the first cycle AFTER reset.
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//! @see TapAction::
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//! @see TapAction::
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//! @param[in] tapStateMachine The TAP state machine with which this action
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//! @param[in] tapStateMachine The TAP state machine with which this action
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//! is associated.
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//! is associated.
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//! @param[out] tdi The value to drive on TDI
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//! @param[out] tdi The value to drive on TDI
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//! @param[in] tdo The value currently on TDO
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//! @param[in] tdo The value currently on TDO
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//! @param[out] tms The value to drive on TMS
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//! @param[out] tms The value to drive on TMS
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//! @return True if the action is complete
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//! @return True if the action is complete
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bool
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bool TapActionReset::process(TapStateMachine * tapStateMachine,
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TapActionReset::process (TapStateMachine *tapStateMachine,
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bool & tdi, bool tdo, bool & tms)
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bool &tdi,
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bool tdo,
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bool &tms)
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{
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if (firstTime)
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{
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{
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if (firstTime) {
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tapStateMachine->setResetDone (false);
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tapStateMachine->setResetDone (false);
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firstTime = false;
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firstTime = false;
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}
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}
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// Parent does the work (no warning message). Our result draws on the value
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// Parent does the work (no warning message). Our result draws on the value
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// set in the tapStateMachine, to avoid an extra cycle.
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// set in the tapStateMachine, to avoid an extra cycle.
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checkResetDone (tapStateMachine, tms, false);
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checkResetDone(tapStateMachine, tms, false);
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return tapStateMachine->getResetDone ();
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return tapStateMachine->getResetDone();
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} // process ()
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} // process ()
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