Subversion Repositories openrisc_2011-10-31

// ----------------------------------------------------------------------------
 
// TAP action header: abstract class definition
 
// 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.
 
// ----------------------------------------------------------------------------
 
// $Id$
 
#ifndef TAP_ACTION__H
#define TAP_ACTION__H
 
#include "TapStateMachine.h"
 
namespace sc_core {
	class sc_event;
}
//! Enumeration of all the TAP actions supported. 
enum TapActionType {
	TAP_ACTION_RESET = 0,
	TAP_ACTION_SHIFT_DR = 1,
	TAP_ACTION_SHIFT_IR = 2
};
 
//! Abstract class to represent a TAP action.
 
//! Subclasses implement specific actions: Reset (TapActionReset::), DR-Scan
//! (TapActionDRScan::) and IR-Scan (TapActionIRScan::).
 
//! We keep a SystemC event, which is used to notify the creator of
//! completion. Since we are not a SystemC class, we don't do the notification
//! ourselves.
 
class TapAction {
public:
 
	friend class JtagSC;
 
	// Constructor
	TapAction(sc_core::sc_event * _doneEvent);
 
protected:
 
	// Accessor for the SystemC event to notify completion
	sc_core::sc_event * getDoneEvent();
 
	// Process the action. Pure virtual, so must be implemented by subclasses.
	virtual bool process(TapStateMachine * tapStateMachine,
			     bool & tdi, bool tdo, bool & tms) = 0;
 
	// Function to drive the TAP to a consistent state, optionally with a
	// warning.
	bool checkResetDone(TapStateMachine * tapStateMachine,
			    bool & tms, bool warn = false);
 
private:
 
	//! The associated SystemC event to mark completion
	 sc_core::sc_event * doneEvent;
 
	//! Counter for the reset process
	int resetCounter;
 
};				// TapAction ()
 
#endif // TAP_ACTION__H