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[/] [openrisc/] [trunk/] [orpsocv2/] [bench/] [sysc/] [src/] [TapStateMachine.cpp] - Blame information for rev 197

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// ----------------------------------------------------------------------------
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// The TAP state machine: implementation
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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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// 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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// 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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// 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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// 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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// 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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// 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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// suitable for processing with Doxygen.
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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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// ----------------------------------------------------------------------------
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// $Id$
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#include "TapStateMachine.h"
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//! Constructor
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//! Start in the Test-Logic-Reset state, although we cannot know this reflects
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//! the hardware until it has been through a TAP reset sequence. This is
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//! reflected in the ::tapResetDone flag.
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TapStateMachine::TapStateMachine () :
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  state (TAP_TEST_LOGIC_RESET),
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  resetDone (false)
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{
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}       // TapStateMachine ()
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//! Accessor to get the current TAP state
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//! Only guaranteed to match the target hardware if it has been through a
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//! reset sequence.
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//! @return  The current TAP state
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TapState
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TapStateMachine::getState ()
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{
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  return  state;
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}       // getState ()
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//! Accessor to get the current TAP reset state.
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//! It is the responsibility of classes using this class to correctly set this
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//! state.
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//! @return  The current TAP reset state
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bool
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TapStateMachine::getResetDone ()
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{
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  return  resetDone;
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}       // getResetDone ()
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//! Accessor to set the current TAP reset state.
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//! It is the responsibility of classes using this class to correctly set this
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//! state.
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//! @param[in]  The desired TAP reset state
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void
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TapStateMachine::setResetDone (bool _resetDone)
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{
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  resetDone = _resetDone;
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}       // setResetDone ()
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//! Drive the TAP state machine
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//! @param tms       The JTAG TMS pin
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void
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TapStateMachine::nextState (bool  tms)
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{
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  static const TapState mapHigh[TAP_SIZE] = {   // When TMS = 1/true          
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    TAP_TEST_LOGIC_RESET,               // from TAP_TEST_LOGIC_RESET  
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    TAP_SELECT_DR_SCAN,                 // from TAP_RUN_TEST_IDLE     
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    TAP_SELECT_IR_SCAN,                 // from TAP_SELECT_DR_SCAN    
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    TAP_EXIT1_DR,                       // from TAP_CAPTURE_DR        
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    TAP_EXIT1_DR,                       // from TAP_SHIFT_DR          
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    TAP_UPDATE_DR,                      // from TAP_EXIT1_DR          
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    TAP_EXIT2_DR,                       // from TAP_PAUSE_DR          
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    TAP_UPDATE_DR,                      // from TAP_EXIT2_DR          
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    TAP_SELECT_DR_SCAN,                 // from TAP_UPDATE_DR         
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    TAP_TEST_LOGIC_RESET,               // from TAP_SELECT_IR_SCAN    
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    TAP_EXIT1_IR,                       // from TAP_CAPTURE_IR        
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    TAP_EXIT1_IR,                       // from TAP_SHIFT_IR          
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    TAP_UPDATE_IR,                      // from TAP_EXIT1_IR          
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    TAP_EXIT2_IR,                       // from TAP_PAUSE_IR          
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    TAP_UPDATE_IR,                      // from TAP_EXIT2_IR          
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    TAP_SELECT_DR_SCAN};                // from TAP_UPDATE_IR         
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  static const TapState mapLow[TAP_SIZE] = {    // When TMS = 0/false
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    TAP_RUN_TEST_IDLE,                  // from TAP_TEST_LOGIC_RESET
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    TAP_RUN_TEST_IDLE,                  // from TAP_RUN_TEST_IDLE   
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    TAP_CAPTURE_DR,                     // from TAP_SELECT_DR_SCAN  
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    TAP_SHIFT_DR,                       // from TAP_CAPTURE_DR      
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    TAP_SHIFT_DR,                       // from TAP_SHIFT_DR        
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    TAP_PAUSE_DR,                       // from TAP_EXIT1_DR        
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    TAP_PAUSE_DR,                       // from TAP_PAUSE_DR        
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    TAP_SHIFT_DR,                       // from TAP_EXIT2_DR        
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    TAP_RUN_TEST_IDLE,                  // from TAP_UPDATE_DR       
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    TAP_CAPTURE_IR,                     // from TAP_SELECT_IR_SCAN  
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    TAP_SHIFT_IR,                       // from TAP_CAPTURE_IR      
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    TAP_SHIFT_IR,                       // from TAP_SHIFT_IR        
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    TAP_PAUSE_IR,                       // from TAP_EXIT1_IR        
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    TAP_PAUSE_IR,                       // from TAP_PAUSE_IR        
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    TAP_SHIFT_IR,                       // from TAP_EXIT2_IR        
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    TAP_RUN_TEST_IDLE };                // from TAP_UPDATE_IR         
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  state = tms ? mapHigh[state] : mapLow[state];
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}       // nextState()
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//! Determine if we are in a particular TAP state
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//! Set TMS to get there optimally
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//! @param[in]  target  The desired TAP state
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//! @param[out] tms     Value of TMS to move towards the target state. Set
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//!                     even if we are already in the state (in case we want
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//!                     to loop).
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//! @return  True if we are already in the target state
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bool
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TapStateMachine::targetState (TapState  target,
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                              bool     &tms)
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{
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  // Map of the value of TMS which moves the state machine from the the state
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  // in the row (first) to the state in the column (second)
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  static const bool map[TAP_SIZE][TAP_SIZE] = {
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  //  T  R  S  C  S  E  P  E  U  S  C  S  E  P  E  U 
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  //  L  T  D  D  D  1  D  2  D  I  I  I  1  I  2  I
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  //  R  I  R  R  R  D  R  D  R  R  R  R  I  R  I  R
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  //        S        R     R     S        R     R
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    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },  // map[TLR][x]
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    { 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },  // map[RTI][x]
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    { 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1 },  // map[SDRS][x]
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    { 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },  // map[CDR][x]
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    { 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },  // map[SDR][x]
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    { 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 },  // map[E1DR][x]
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    { 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1 },  // map[PDR][x]
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    { 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 },  // map[E2DR][x]
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    { 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },  // map[UDR][x]
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    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0 },  // map[SIRS][x]
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    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1 },  // map[CIR][x]
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    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1 },  // map[SIR][x]
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    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1 },  // map[E1IR][x]
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    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1 },  // map[PIR][x]
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    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1 },  // map[E2IR][x]
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    { 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }}; // map[UIR][x]
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  tms = map[state][target];
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  return state == target;
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}       // targetState()

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