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[/] [openrisc/] [trunk/] [orpsocv2/] [bench/] [sysc/] [include/] [TapStateMachine.h] - Rev 178
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// ---------------------------------------------------------------------------- // The TAP state machine: 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/>. // ---------------------------------------------------------------------------- // $Id$ #ifndef TAP_STATE_MACHINE__H #define TAP_STATE_MACHINE__H //! Enumeration of all the states in the TAP state machine. //! Last entry is not a state, but a marker of the number of states. Useful //! for state transition matrices. enum TapState { TAP_TEST_LOGIC_RESET = 0, TAP_RUN_TEST_IDLE = 1, TAP_SELECT_DR_SCAN = 2, TAP_CAPTURE_DR = 3, TAP_SHIFT_DR = 4, TAP_EXIT1_DR = 5, TAP_PAUSE_DR = 6, TAP_EXIT2_DR = 7, TAP_UPDATE_DR = 8, TAP_SELECT_IR_SCAN = 9, TAP_CAPTURE_IR = 10, TAP_SHIFT_IR = 11, TAP_EXIT1_IR = 12, TAP_PAUSE_IR = 13, TAP_EXIT2_IR = 14, TAP_UPDATE_IR = 15, TAP_SIZE = 16 }; // enum TapState //! Textual representation of all the TAP states. //! Provided for debugging purposes static const char *tapStateNames[TAP_SIZE] = { "Test-Logic-Reset", "Run-Test/Idle", "Select-DR-Scan", "Capture-DR", "Shift-DR", "Exit1-DR", "Pause-DR", "Exit2-DR", "Update-DR", "Select-IR-Scan", "Capture-IR", "Shift-IR", "Exit1-IR", "Pause-IR", "Exit2-IR", "Update-IR" }; // tapStateNames //! TAP state machine //! Tracks the state of the TAP. This should mirror the state of the TAP in //! the connected HW. //! The state machine is created in the reset condition, but in truth we //! cannot know what the state is. It is essential the TAP is reset before //! first being used. //! We cannot know for certain when the TAP state machine has been reset. 5 //! consecutive TMS=1 transitions will take you there, but a reset of the //! target could undo this. It is the responsibility of the user of the TAP //! state machine. //! For convenience of users, this class provides a flag (resetDone::), //! with accessors by which reset state can be recorded. class TapStateMachine { public: friend class JtagSC; friend class TapAction; friend class TapActionDRScan; friend class TapActionIRScan; friend class TapActionReset; protected: //! The number of cycles of TMS=1 required to force reset static const int TAP_RESET_CYCLES = 5; // Constructor TapStateMachine(); // Accessor for TAP state TapState getState (); // Accessors for TAP reset state bool getResetDone (); void setResetDone (bool _resetState); // Drive the TAP state machine void nextState (bool tms); // Determine if we are in a particular target state bool targetState (TapState target, bool &tms); private: //! The current TAP state TapState state; //! True if the TAP state machine has been through a reset. //! The state can be sure to match that of the target. Responsibility of //! user classes to set this. bool resetDone; }; // class TapStateMachine #endif // TAP_STATE_MACHINE__H
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