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[/] [openrisc/] [trunk/] [orpsocv2/] [bench/] [sysc/] [src/] [JtagSC.cpp] - Rev 76
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// ---------------------------------------------------------------------------- // Main module providing the JTAG interface: 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 "JtagSC.h" SC_HAS_PROCESS( JtagSC ); //! Constructor for the JTAG handler. //! @param[in] name Name of this module, passed to the parent //! constructor. //! @param[in] fifo_size Size of the FIFO on which to queue TAP actions. JtagSC::JtagSC (sc_core::sc_module_name name, int fifo_size) : sc_module (name), currentTapAction (NULL) { tapActionQueue = new sc_core::sc_fifo<TapAction *> (fifo_size); stateMachine = new TapStateMachine (); SC_METHOD (processActions); sensitive << tck.pos (); } // JtagSC () //! Destructor for the JTAG handler. //! Give up our state machine and FIFO JtagSC::~JtagSC () { delete stateMachine; delete tapActionQueue; } // ~JtagSC () //! Method to drive the jtag ports. //! Initial version just drives the reset. void JtagSC::processActions() { // TRST is driven as the inverse of the system reset trst = !sysReset; // Do nothing else if in CPU reset (active high) if (sysReset) { return; } // Functions setting the outputs will need bools (they are not generally // SystemC modules, so don't handle the likes of sc_in<> correctly). bool tdi_o; bool tms_o; // Try to get an action if we don't have one if (NULL == currentTapAction) { if (false == tapActionQueue->nb_read (currentTapAction)) { // Nothing there, so head for Run-Test/Idle state. stateMachine->targetState (TAP_RUN_TEST_IDLE, tms_o); tms = tms_o; return; } } // Process the action, notifying the originator when done. if (currentTapAction->process (stateMachine, tdi_o, tdo, tms_o)) { currentTapAction->getDoneEvent()->notify(); currentTapAction = NULL; } // Select the new TAP state stateMachine->nextState (tms_o); // Drive the signal ports tdi = tdi_o; tms = tms_o; } // processActions()
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