// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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// TAP IR-Scan action: definition
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// TAP IR-Scan action: definition
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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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#ifndef TAP_ACTION_IR_SCAN__H
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#ifndef TAP_ACTION_IR_SCAN__H
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#define TAP_ACTION_IR_SCAN__H
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#define TAP_ACTION_IR_SCAN__H
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#include <stdint.h>
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#include <stdint.h>
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#include "TapAction.h"
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#include "TapAction.h"
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#include "TapStateMachine.h"
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#include "TapStateMachine.h"
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//! Class to represent a TAP IR-Scan action.
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//! Class to represent a TAP IR-Scan action.
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//! This class assumes that JTAG instruction registers are relatively
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//! This class assumes that JTAG instruction registers are relatively
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//! small. IEEE 1149.1 mandates at least 2 bits, although implementations
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//! small. IEEE 1149.1 mandates at least 2 bits, although implementations
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//! often have a wider range of instructions. The OpenRISC 1000 debug unit for
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//! often have a wider range of instructions. The OpenRISC 1000 debug unit for
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//! example uses 5 bits. 32-bits seems more than enough for the largest
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//! example uses 5 bits. 32-bits seems more than enough for the largest
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//! applications.
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//! applications.
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class TapActionIRScan
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class TapActionIRScan:public TapAction {
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: public TapAction
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{
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public:
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public:
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// Constructor
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// Constructor
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TapActionIRScan (sc_core::sc_event *_doneEvent,
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TapActionIRScan (sc_core::sc_event *_doneEvent,
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uint32_t _iRegIn,
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uint32_t _iRegIn, int _iRegSize);
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int _iRegSize);
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// Get the shifted out value
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// Get the shifted out value
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uint32_t getIRegOut ();
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uint32_t getIRegOut();
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protected:
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protected:
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// Process the action for IR-Scan
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// Process the action for IR-Scan
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bool process (TapStateMachine *tapStateMachine,
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bool process (TapStateMachine *tapStateMachine,
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bool &tdi,
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bool & tdi, bool tdo, bool & tms);
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bool tdo,
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bool &tms);
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private:
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private:
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//! The value being shifted in
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//! The value being shifted in
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uint32_t iRegIn;
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uint32_t iRegIn;
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//! The number of bits to shift
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//! The number of bits to shift
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int iRegSize;
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int iRegSize;
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//! The value shifted out
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//! The value shifted out
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uint32_t iRegOut;
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uint32_t iRegOut;
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//! The number of bits shifted so far
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//! The number of bits shifted so far
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int bitsShifted;
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int bitsShifted;
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//! Where we are in the IR-scan process
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//! Where we are in the IR-scan process
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enum {
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enum {
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SHIFT_IR_PREPARING,
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SHIFT_IR_PREPARING,
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SHIFT_IR_SHIFTING,
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SHIFT_IR_SHIFTING,
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SHIFT_IR_UPDATING
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SHIFT_IR_UPDATING
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} iRScanState;
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} iRScanState;
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}; // TapActionIRScan
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}; // TapActionIRScan
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#endif // TAP_ACTION_IR_SCAN__H
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#endif // TAP_ACTION_IR_SCAN__H
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