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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  dbg_trace.v                                                 ////

////                                                              ////

////                                                              ////

////  This file is part of the SoC/OpenRISC Development Interface ////

////  http://www.opencores.org/cores/DebugInterface/              ////

////                                                              ////

////                                                              ////

////  Author(s):                                                  ////

////       Igor Mohor                                             ////

////       igorm@opencores.org                                    ////

////                                                              ////

////                                                              ////

////  All additional information is avaliable in the README.txt   ////

////  file.                                                       ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2000,2001 Authors                              ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file 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 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

////                                                              ////

//// This source 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 source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

//

// CVS Revision History

//

// $Log: not supported by cvs2svn $

// Revision 1.4  2001/09/20 10:11:25  mohor

// Working version. Few bugs fixed, comments added.

//

// Revision 1.3  2001/09/19 11:55:13  mohor

// Asynchronous set/reset not used in trace any more.

//

// Revision 1.2  2001/09/18 14:13:47  mohor

// Trace fixed. Some registers changed, trace simplified.

//

// Revision 1.1.1.1  2001/09/13 13:49:19  mohor

// Initial official release.

//

// Revision 1.3  2001/06/01 22:22:35  mohor

// This is a backup. It is not a fully working version. Not for use, yet.

//

// Revision 1.2  2001/05/18 13:10:00  mohor

// Headers changed. All additional information is now avaliable in the README.txt file.

//

// Revision 1.1.1.1  2001/05/18 06:35:06  mohor

// Initial release

//

//

`include "timescale.v"

`include "dbg_defines.v"

// module Trace

module dbg_trace (Wp, Bp, DataIn, OpSelect, LsStatus, IStatus, RiscStall_O,

                  Mclk, Reset, TraceChain, ContinMode, TraceEnable_reg,

                  WpTrigger, BpTrigger, LSSTrigger, ITrigger, TriggerOper, WpQualif,

                  BpQualif, LSSQualif, IQualif, QualifOper, RecordPC, RecordLSEA,

                  RecordLDATA, RecordSDATA, RecordReadSPR, RecordWriteSPR,

                  RecordINSTR,

                  WpTriggerValid, BpTriggerValid, LSSTriggerValid, ITriggerValid,

                  WpQualifValid, BpQualifValid, LSSQualifValid, IQualifValid, ReadBuffer,

                  WpStop, BpStop, LSSStop, IStop, StopOper, WpStopValid, BpStopValid,

                  LSSStopValid, IStopValid

                 );

parameter Tp = 1;

input [10:0] Wp;              // Watchpoints

input        Bp;              // Breakpoint

input [31:0] DataIn;          // Data from the RISC

input [3:0]  LsStatus;        // Load/Store status

input [1:0]  IStatus;         // Instruction status

input        Mclk;            // Master clock (RISC clock)

input        Reset;           // Reset

input        ReadBuffer;      // Instruction for reading a sample from the Buffer

// from registers

input ContinMode;             // Continous mode of the trace

input TraceEnable_reg;        // Trace is enabled (enabled by writing a bit in the register)

input [10:0] WpTrigger;       // Signals that come from registers to set the trigger

input        BpTrigger;       // Signals that come from registers to set the trigger

input [3:0]  LSSTrigger;      // Signals that come from registers to set the trigger

input [1:0]  ITrigger;        // Signals that come from registers to set the trigger

input [1:0]  TriggerOper;     // Signals that come from registers to set the trigger

input [10:0] WpQualif;        // Signals that come from registers to set the qualifier

input        BpQualif;        // Signals that come from registers to set the qualifier

input [3:0]  LSSQualif;       // Signals that come from registers to set the qualifier

input [1:0]  IQualif;         // Signals that come from registers to set the qualifier

input [1:0]  QualifOper;      // Signals that come from registers to set the qualifier

input [10:0] WpStop;          // Signals that come from registers to set the stop condition

input        BpStop;          // Signals that come from registers to set the stop condition

input [3:0]  LSSStop;         // Signals that come from registers to set the stop condition

input [1:0]  IStop;           // Signals that come from registers to set the stop condition

input [1:0]  StopOper;        // Signals that come from registers to set the stop condition

input RecordPC;               // Signals that come from registers for defining the sample for recording

input RecordLSEA;             // Signals that come from registers for defining the sample for recording

input RecordLDATA;            // Signals that come from registers for defining the sample for recording

input RecordSDATA;            // Signals that come from registers for defining the sample for recording

input RecordReadSPR;          // Signals that come from registers for defining the sample for recording

input RecordWriteSPR;         // Signals that come from registers for defining the sample for recording

input RecordINSTR;            // Signals that come from registers for defining the sample for recording

input WpTriggerValid;         // Signals that come from registers and indicate which trigger conditions are valid

input BpTriggerValid;         // Signals that come from registers and indicate which trigger conditions are valid

input LSSTriggerValid;        // Signals that come from registers and indicate which trigger conditions are valid

input ITriggerValid;          // Signals that come from registers and indicate which trigger conditions are valid

input WpQualifValid;          // Signals that come from registers and indicate which qualifier conditions are valid

input BpQualifValid;          // Signals that come from registers and indicate which qualifier conditions are valid

input LSSQualifValid;         // Signals that come from registers and indicate which qualifier conditions are valid

input IQualifValid;           // Signals that come from registers and indicate which qualifier conditions are valid

input WpStopValid;            // Signals that come from registers and indicate which stop conditions are valid

input BpStopValid;            // Signals that come from registers and indicate which stop conditions are valid

input LSSStopValid;           // Signals that come from registers and indicate which stop conditions are valid

input IStopValid;             // Signals that come from registers and indicate which stop conditions are valid

// end: from registers

output [`OPSELECTWIDTH-1:0]  OpSelect;  // Operation select (what kind of information is avaliable on the DataIn)

output        RiscStall_O;              // CPU stall (stalls the RISC)

output [39:0] TraceChain;               // Scan shain from the trace module

reg TraceEnable_d;

reg TraceEnable;

reg [`TRACECOUNTERWIDTH:0] Counter;

reg [`TRACECOUNTERWIDTH-1:0] WritePointer;

reg [`TRACECOUNTERWIDTH-1:0] ReadPointer;

reg RiscStall;

reg RiscStall_q;

reg [`OPSELECTWIDTH-1:0] StallCounter;

reg [`TRACESAMPLEWIDTH-1:0] Buffer[0:`TRACEBUFFERLENGTH-1];

reg TriggerLatch;

/**********************************************************************************

*                                                                                 *

*   Generation of the trigger                                                     *

*                                                                                 *

**********************************************************************************/

wire TempWpTrigger = |(Wp[10:0] & WpTrigger[10:0]);

wire TempBpTrigger = Bp & BpTrigger;

wire TempLSSTrigger = LsStatus[3:0] == LSSTrigger[3:0];

wire TempITrigger = IStatus[1:0] == ITrigger[1:0];

wire TempTriggerAND =  (  (TempWpTrigger  | ~WpTriggerValid)

                        & (TempBpTrigger  | ~BpTriggerValid)

                        & (TempLSSTrigger | ~LSSTriggerValid)

                        & (TempITrigger   | ~ITriggerValid)

                       )

                       & (WpTriggerValid | BpTriggerValid | LSSTriggerValid | ITriggerValid);

wire TempTriggerOR =   (  (TempWpTrigger  &  WpTriggerValid)

                        | (TempBpTrigger  &  BpTriggerValid)

                        | (TempLSSTrigger &  LSSTriggerValid)

                        | (TempITrigger   &  ITriggerValid)

                       );

wire Trigger = TraceEnable & (~TriggerOper[1]?  1 :                               // any

                               TriggerOper[0]?  TempTriggerAND : TempTriggerOR    // AND : OR

                             );

/**********************************************************************************

*                                                                                 *

*   Generation of the qualifier                                                   *

*                                                                                 *

**********************************************************************************/

wire TempWpQualifier = |(Wp[10:0] & WpQualif[10:0]);

wire TempBpQualifier = Bp & BpQualif;

wire TempLSSQualifier = LsStatus[3:0] == LSSQualif[3:0];

wire TempIQualifier = IStatus[1:0] == IQualif[1:0];

wire TempQualifierAND =  (  (TempWpQualifier  | ~WpQualifValid)

                          & (TempBpQualifier  | ~BpQualifValid)

                          & (TempLSSQualifier | ~LSSQualifValid)

                          & (TempIQualifier   | ~IQualifValid)

                         )

                         & (WpQualifValid | BpQualifValid | LSSQualifValid | IQualifValid);

wire TempQualifierOR =   (  (TempWpQualifier  &  WpQualifValid)

                          | (TempBpQualifier  &  BpQualifValid)

                          | (TempLSSQualifier &  LSSQualifValid)

                          | (TempIQualifier   &  IQualifValid)

                         );

wire Stop;

wire Qualifier = TraceEnable & ~Stop & (~QualifOper[1]? 1 :                                   // any

                                         QualifOper[0]? TempQualifierAND  :  TempQualifierOR  // AND : OR

                                       );

/**********************************************************************************

*                                                                                 *

*   Generation of the stop signal                                                 *

*                                                                                 *

**********************************************************************************/

wire TempWpStop = |(Wp[10:0] & WpStop[10:0]);

wire TempBpStop = Bp & BpStop;

wire TempLSSStop = LsStatus[3:0] == LSSStop[3:0];

wire TempIStop = IStatus[1:0] == IStop[1:0];

wire TempStopAND =       (  (TempWpStop  | ~WpStopValid)

                          & (TempBpStop  | ~BpStopValid)

                          & (TempLSSStop | ~LSSStopValid)

                          & (TempIStop   | ~IStopValid)

                         )

                         & (WpStopValid | BpStopValid | LSSStopValid | IStopValid);

wire TempStopOR =        (  (TempWpStop  &  WpStopValid)

                          | (TempBpStop  &  BpStopValid)

                          | (TempLSSStop &  LSSStopValid)

                          | (TempIStop   &  IStopValid)

                         );

assign Stop = TraceEnable & (~StopOper[1]? 0 :                         // nothing

                              StopOper[0]? TempStopAND  :  TempStopOR  // AND : OR

                            );

/**********************************************************************************

*                                                                                 *

*   Generation of the TriggerLatch                                                *

*                                                                                 *

**********************************************************************************/

always @(posedge Mclk or posedge Reset)

begin

  if(Reset)

    TriggerLatch<=#Tp 0;

  else

  if(TriggerLatch & ~TraceEnable)

    TriggerLatch<=#Tp 0;

  else

  if(Trigger)

    TriggerLatch<=#Tp 1;

end

/**********************************************************************************

*                                                                                 *

*   TraceEnable Synchronization                                                   *

*                                                                                 *

**********************************************************************************/

always @(posedge Mclk or posedge Reset)

begin

  if(Reset)

    begin

      TraceEnable_d<=#Tp 0;

      TraceEnable<=#Tp 0;

    end

  else

    begin

      TraceEnable_d<=#Tp TraceEnable_reg;

      TraceEnable<=#Tp TraceEnable_d;

    end

end

/**********************************************************************************

*                                                                                 *

*   RiscStall, counter and pointers generation                                     *

*                                                                                 *

**********************************************************************************/

reg BufferFullDetected;

wire [`OPSELECTIONCOUNTER-1:0] RecEnable;

wire BufferFull = Counter[`TRACECOUNTERWIDTH:0]==`TRACEBUFFERLENGTH;

wire BufferEmpty = Counter[`TRACECOUNTERWIDTH:0]==0;

wire IncrementCounter = RiscStall_q & ~(BufferFull | BufferFullDetected) & Qualifier & RecEnable[StallCounter];

wire IncrementPointer = RiscStall_q & (~BufferFull | ContinMode) & Qualifier & RecEnable[StallCounter];

wire WriteSample = IncrementPointer;

wire Decrement = ReadBuffer & ~BufferEmpty & (~ContinMode | ContinMode & ~TraceEnable);

wire CounterEn = IncrementCounter ^ Decrement;

wire SyncResetCpuStall;

wire ResetStallCounter;

reg BufferFull_q;

reg BufferFull_2q;

reg Qualifier_mclk;

always @(posedge Mclk)

begin

  Qualifier_mclk<=#Tp Qualifier;

  BufferFull_q<=#Tp BufferFull;

  BufferFull_2q<=#Tp BufferFull_q;

  RiscStall_q <=#Tp RiscStall_O;

end

wire FirstCpuStall =    Qualifier & ~Qualifier_mclk & TriggerLatch              |

                        Qualifier_mclk & Trigger & ~TriggerLatch                |

                        Qualifier & Trigger & ~Qualifier_mclk & ~TriggerLatch   ;

//wire SyncSetCpuStall = Qualifier_mclk & TriggerLatch &

wire SyncSetCpuStall = RiscStall_O & ~RiscStall_q |

                        Qualifier_mclk & TriggerLatch &

                       (

                        (~ContinMode & ~BufferFull & ~BufferFull_q & StallCounter==`OPSELECTIONCOUNTER-1) |

                        (~ContinMode & ~BufferFull_q & BufferFull_2q & StallCounter==0)                   |

                        ( ContinMode & StallCounter==`OPSELECTIONCOUNTER-1)

                       );

assign SyncResetCpuStall = (

                            (~ContinMode & ~BufferFull & ~BufferFull_q & StallCounter==`OPSELECTIONCOUNTER-2) |

                            (~ContinMode &  ~BufferFull & BufferFull_q & StallCounter==`OPSELECTIONCOUNTER-1) |

                            ( ContinMode & StallCounter==`OPSELECTIONCOUNTER-2)

                           );

assign RiscStall_O = FirstCpuStall | RiscStall;

always @(posedge Mclk or posedge Reset)

begin

  if(Reset)

    Counter<=#Tp 0;

  else

  if(CounterEn)

    if(IncrementCounter)

      Counter[`TRACECOUNTERWIDTH:0]<=#Tp Counter[`TRACECOUNTERWIDTH:0] + 1;

    else

      Counter[`TRACECOUNTERWIDTH:0]<=#Tp Counter[`TRACECOUNTERWIDTH:0] - 1;

end

always @(posedge Mclk or posedge Reset)

begin

  if(Reset)

    WritePointer<=#Tp 0;

  else

  if(IncrementPointer)

    WritePointer[`TRACECOUNTERWIDTH-1:0]<=#Tp WritePointer[`TRACECOUNTERWIDTH-1:0] + 1;

end

always @(posedge Mclk or posedge Reset)

begin

  if(Reset)

    ReadPointer<=#Tp 0;

  else

  if(Decrement & ~ContinMode | Decrement & ContinMode & ~TraceEnable)

    ReadPointer[`TRACECOUNTERWIDTH-1:0]<=#Tp ReadPointer[`TRACECOUNTERWIDTH-1:0] + 1;

  else

  if(ContinMode & IncrementPointer & (BufferFull | BufferFullDetected))

    ReadPointer[`TRACECOUNTERWIDTH-1:0]<=#Tp WritePointer[`TRACECOUNTERWIDTH-1:0] + 1;

end

always @(posedge Mclk)

begin

  if(~TraceEnable)

    BufferFullDetected<=#Tp 0;

  else

  if(ContinMode & BufferFull)

    BufferFullDetected<=#Tp 1;

end

always @(posedge Mclk or posedge Reset)

begin

  if(Reset)

    RiscStall<=#Tp 0;

  else

  if(SyncResetCpuStall)

    RiscStall<=#Tp 0;

  else

  if(SyncSetCpuStall)

    RiscStall<=#Tp 1;

end

always @(posedge Mclk)

begin

  if(ResetStallCounter)

    StallCounter<=#Tp 0;

  else

  if(RiscStall_q & (~BufferFull | ContinMode))

    StallCounter<=#Tp StallCounter+1;

end

assign ResetStallCounter = StallCounter==(`OPSELECTIONCOUNTER-1) & ~BufferFull | Reset;

/**********************************************************************************

*                                                                                 *

*   Valid status                                                                  *

*                                                                                 *

**********************************************************************************/

wire Valid = ~BufferEmpty;

/**********************************************************************************

*                                                                                 *

*   Writing and reading the sample to/from the buffer                             *

*                                                                                 *

**********************************************************************************/

always @ (posedge Mclk)

begin

  if(WriteSample)

    Buffer[WritePointer[`TRACECOUNTERWIDTH-1:0]]<={DataIn, 1'b0, OpSelect[`OPSELECTWIDTH-1:0]};

end

assign TraceChain = {Buffer[ReadPointer], 3'h0, Valid};

/**********************************************************************************

*                                                                                 *

*   Operation select (to select which kind of data appears on the DATAIN lines)   *

*                                                                                 *

**********************************************************************************/

assign OpSelect[`OPSELECTWIDTH-1:0] = StallCounter[`OPSELECTWIDTH-1:0];

/**********************************************************************************

*                                                                                 *

*   Selecting which parts are going to be recorded as part of the sample          *

*                                                                                 *

**********************************************************************************/

assign RecEnable = {1'b0, RecordINSTR,  RecordWriteSPR,  RecordReadSPR,  RecordSDATA,  RecordLDATA,  RecordLSEA,  RecordPC};

endmodule