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

////                                                              ////

////  dbg_registers.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 1.2  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 06:35:10  mohor

// Initial release

//

//

`include "dbg_timescale.v"

`include "dbg_defines.v"

module dbg_registers(DataIn, DataOut, Address, RW, Access, Clk, Bp, Reset,

                     `ifdef TRACE_ENABLED

                     ContinMode,

                     TraceEnable, 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,

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

                     LSSStopValid, IStopValid,

                     `endif

                     RiscStall, RiscReset

                    );

parameter Tp = 1;

input [31:0] DataIn;

input [4:0] Address;

input RW;

input Access;

input Clk;

input Bp;

input Reset;

output [31:0] DataOut;

reg    [31:0] DataOut;

`ifdef TRACE_ENABLED

  output ContinMode;

  output TraceEnable;

  output [10:0] WpTrigger;

  output        BpTrigger;

  output [3:0]  LSSTrigger;

  output [1:0]  ITrigger;

  output [1:0]  TriggerOper;

  output        WpTriggerValid;

  output        BpTriggerValid;

  output        LSSTriggerValid;

  output        ITriggerValid;

  output [10:0] WpQualif;

  output        BpQualif;

  output [3:0]  LSSQualif;

  output [1:0]  IQualif;

  output [1:0]  QualifOper;

  output        WpQualifValid;

  output        BpQualifValid;

  output        LSSQualifValid;

  output        IQualifValid;

  output [10:0] WpStop;

  output        BpStop;

  output [3:0]  LSSStop;

  output [1:0]  IStop;

  output [1:0]  StopOper;

  output WpStopValid;

  output BpStopValid;

  output LSSStopValid;

  output IStopValid;

  output RecordPC;

  output RecordLSEA;

  output RecordLDATA;

  output RecordSDATA;

  output RecordReadSPR;

  output RecordWriteSPR;

  output RecordINSTR;

`endif

  output RiscStall;

  output RiscReset;

  wire MODER_Acc =   (Address == `MODER_ADR)   & Access;

  wire RISCOP_Acc =  (Address == `RISCOP_ADR)  & Access;

`ifdef TRACE_ENABLED

  wire TSEL_Acc =    (Address == `TSEL_ADR)    & Access;

  wire QSEL_Acc =    (Address == `QSEL_ADR)    & Access;

  wire SSEL_Acc =    (Address == `SSEL_ADR)    & Access;

  wire RECSEL_Acc =  (Address == `RECSEL_ADR)  & Access;

`endif

  wire MODER_Wr =   MODER_Acc   &  RW;

  wire RISCOP_Wr =  RISCOP_Acc  &  RW;

`ifdef TRACE_ENABLED

  wire TSEL_Wr =    TSEL_Acc    &  RW;

  wire QSEL_Wr =    QSEL_Acc    &  RW;

  wire SSEL_Wr =    SSEL_Acc    &  RW;

  wire RECSEL_Wr =  RECSEL_Acc  &  RW;

`endif

  wire MODER_Rd =   MODER_Acc   &  ~RW;

  wire RISCOP_Rd =  RISCOP_Acc  &  ~RW;

`ifdef TRACE_ENABLED

  wire TSEL_Rd =    TSEL_Acc    &  ~RW;

  wire QSEL_Rd =    QSEL_Acc    &  ~RW;

  wire SSEL_Rd =    SSEL_Acc    &  ~RW;

  wire RECSEL_Rd =  RECSEL_Acc  &  ~RW;

`endif

  wire [31:0] MODEROut;

  wire [1:1]  RISCOPOut;

`ifdef TRACE_ENABLED

  wire [31:0] TSELOut;

  wire [31:0] QSELOut;

  wire [31:0] SSELOut;

  wire [6:0]  RECSELOut;

`endif

`ifdef TRACE_ENABLED

  assign MODEROut[15:0] = 16'h0001;

  assign MODEROut[31:18] = 14'h0;

`else

  assign MODEROut[31:0] = 32'h0000;

`endif

  reg RiscStallBp;

  always @(posedge Clk or posedge Reset)

  begin

    if(Reset)

      RiscStallBp <= 1'b0;

    else

    if(Bp)                      // Breakpoint sets bit

      RiscStallBp <= 1'b1;

    else

    if(RISCOP_Wr)               // Register access can set or clear bit

      RiscStallBp <= DataIn[0];

  end

  dbg_register #(1)  RISCOP (.DataIn(DataIn[1]), .DataOut(RISCOPOut[1]), .Write(RISCOP_Wr),   .Clk(Clk), .Reset(Reset), .Default(1'b0));

`ifdef TRACE_ENABLED

  dbg_register #(2)  MODER  (.DataIn(DataIn[17:16]), .DataOut(MODEROut[17:16]), .Write(MODER_Wr),   .Clk(Clk), .Reset(Reset), .Default(`MODER_DEF));

  dbg_register #(32) TSEL   (.DataIn(DataIn),      .DataOut(TSELOut),    .Write(TSEL_Wr),    .Clk(Clk), .Reset(Reset), .Default(`TSEL_DEF));

  dbg_register #(32) QSEL   (.DataIn(DataIn),      .DataOut(QSELOut),    .Write(QSEL_Wr),    .Clk(Clk), .Reset(Reset), .Default(`QSEL_DEF));

  dbg_register #(32) SSEL   (.DataIn(DataIn),      .DataOut(SSELOut),    .Write(SSEL_Wr),    .Clk(Clk), .Reset(Reset), .Default(`SSEL_DEF));

  dbg_register #(7) RECSEL  (.DataIn(DataIn[6:0]), .DataOut(RECSELOut),  .Write(RECSEL_Wr),  .Clk(Clk), .Reset(Reset), .Default(`RECSEL_DEF));

`endif

always @ (posedge Clk)

begin

  if(MODER_Rd)    DataOut<= #Tp MODEROut;

  else

  if(RISCOP_Rd)   DataOut<= #Tp {30'h0, RISCOPOut[1], RiscStall};

`ifdef TRACE_ENABLED

  else

  if(TSEL_Rd)     DataOut<= #Tp TSELOut;

  else

  if(QSEL_Rd)     DataOut<= #Tp QSELOut;

  else

  if(SSEL_Rd)     DataOut<= #Tp SSELOut;

  else

  if(RECSEL_Rd)   DataOut<= #Tp {25'h0, RECSELOut};

`endif

  else            DataOut<= #Tp 'h0;

end

`ifdef TRACE_ENABLED

  assign TraceEnable       = MODEROut[16];

  assign ContinMode        = MODEROut[17];

  assign WpTrigger[10:0]   = TSELOut[10:0];

  assign WpTriggerValid    = TSELOut[11];

  assign BpTrigger         = TSELOut[12];

  assign BpTriggerValid    = TSELOut[13];

  assign LSSTrigger[3:0]   = TSELOut[19:16];

  assign LSSTriggerValid   = TSELOut[20];

  assign ITrigger[1:0]     = TSELOut[22:21];

  assign ITriggerValid     = TSELOut[23];

  assign TriggerOper[1:0]  = TSELOut[31:30];

  assign WpQualif[10:0]    = QSELOut[10:0];

  assign WpQualifValid     = QSELOut[11];

  assign BpQualif          = QSELOut[12];

  assign BpQualifValid     = QSELOut[13];

  assign LSSQualif[3:0]    = QSELOut[19:16];

  assign LSSQualifValid    = QSELOut[20];

  assign IQualif[1:0]      = QSELOut[22:21];

  assign IQualifValid      = QSELOut[23];

  assign QualifOper[1:0]   = QSELOut[31:30];

  assign WpStop[10:0]    = SSELOut[10:0];

  assign WpStopValid     = SSELOut[11];

  assign BpStop          = SSELOut[12];

  assign BpStopValid     = SSELOut[13];

  assign LSSStop[3:0]    = SSELOut[19:16];

  assign LSSStopValid    = SSELOut[20];

  assign IStop[1:0]      = SSELOut[22:21];

  assign IStopValid      = SSELOut[23];

  assign StopOper[1:0]   = SSELOut[31:30];

  assign RecordPC           = RECSELOut[0];

  assign RecordLSEA         = RECSELOut[1];

  assign RecordLDATA        = RECSELOut[2];

  assign RecordSDATA        = RECSELOut[3];

  assign RecordReadSPR      = RECSELOut[4];

  assign RecordWriteSPR     = RECSELOut[5];

  assign RecordINSTR        = RECSELOut[6];

`endif

  assign RiscStall          = Bp | RiscStallBp;   // Bp asynchronously sets the RiscStall, then RiscStallBp (from register) holds it active

  assign RiscReset          = RISCOPOut[1];

endmodule