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

Theia, Ray Cast Programable graphic Processing Unit.

Copyright (C) 2010  Diego Valverde (diego.valverde.g@gmail.com)

This program is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public License

as published by the Free Software Foundation; either version 2

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 General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

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

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

Description:

 This is the top level block for THEIA.

 THEIA core has 5 main logical blocks called Units.

 This module implements the interconections between the Units.

 Units:

  > EXE: Mananges execution logic for the SHADERS.

  > GEO: Manages geometry data structures.

  > IO: Input/Output (Wishbone).

  > MEM: Internal memory, separate for Instructions and data.

  > CONTROL: Main control Finite state machine.

 Internal Buses:

        THEIA has separate instruction and data buses.

        THEIA avoids using tri-state buses by having separate input/output

        for each bus.

        There are 2 separate data buses since the Data memory

        has a Dual read channel.

   Please see the MEM unit chapter in the documentation for more details.

 External Buses:

        External buses are managed by the IO Unit.

        External buses follow the wishbone protocol.

        Please see the IO unit chapter in the documentation for more details.

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

`timescale 1ns / 1ps

`include "aDefinitions.v"

module THEIACORE

(

input wire                    CLK_I,    //Input clock

input wire                    RST_I,    //Input reset

//Theia Interfaces

input wire                    MST_I,    //Master signal, THEIA enters configuration mode

                                       //when this gets asserted (see documentation)

//Wish Bone Interface

input wire [`WB_WIDTH-1:0]    DAT_I,     //Input data bus  (Wishbone)

output wire [`WB_WIDTH-1:0]   DAT_O,     //Output data bus (Wishbone)

input wire                    ACK_I,    //Input ack

output wire                   ACK_O,    //Output ack

output wire [`WB_WIDTH-1:0]   ADR_O,     //Output address

input wire [`WB_WIDTH-1:0]    ADR_I,     //Input address

output wire                   WE_O,             //Output write enable

input wire                    WE_I,    //Input write enable

output wire                   STB_O,    //Strobe signal, see wishbone documentation

input wire                    STB_I,    //Strobe signal, see wishbone documentation

output wire                   CYC_O,    //Bus cycle signal, see wishbone documentation

input wire                    CYC_I,   //Bus cycle signal, see wishbone documentation

output wire     [1:0]             TGC_O,   //Bus cycle tag, see THEAI documentation

input wire [1:0]              TGA_I,   //Input address tag, see THEAI documentation

output wire [1:0]             TGA_O,   //Output address tag, see THEAI documentation

input wire      [1:0]             TGC_I,   //Bus cycle tag, see THEAI documentation

input wire                    GNT_I,   //Bus arbiter 'Granted' signal, see THEAI documentation

input wire                    RENDREN_I,

`ifdef DEBUG

input wire[`MAX_CORES-1:0]    iDebug_CoreID,

`endif

//Control Register

input wire [15:0]                         CREG_I,

output wire                   DONE_O

);

//Alias this signals

wire Clock,Reset;

assign Clock = CLK_I;

assign Reset = RST_I;

wire [`DATA_ROW_WIDTH-1:0]                        wEXE_2__MEM_WriteData;

wire [`DATA_ROW_WIDTH-1:0]                        wUCODE_RAMBus;

wire [`DATA_ADDRESS_WIDTH-1:0]    wEXE_2__MEM_wDataWriteAddress;

wire                              w2IO__AddrIsImm;

wire [`DATA_ADDRESS_WIDTH-1:0]    wUCODE_RAMAddress;

wire [`DATA_ADDRESS_WIDTH-1:0]    w2IO__Adr_O_Pointer;

wire [`DATA_ADDRESS_WIDTH-1:0]    wGEO2_IO__Adr_O_Pointer;

wire                                                                             wEXE_2__DataWriteEnable;

wire                                                                             wUCODE_RAMWriteEnable;

wire [2:0]                                                                RamBusOwner;

//Unit intercoanection wires

wire                                                                            wCU2__MicrocodeExecutionDone;

wire [`ROM_ADDRESS_WIDTH-1:0]            InitialCodeAddress;

wire [`ROM_ADDRESS_WIDTH-1:0]            wInstructionPointer1,wInstructionPointer2;

wire [`INSTRUCTION_WIDTH-1:0]    wEncodedInstruction1,wEncodedInstruction2,wIO2_MEM__ExternalInstruction;

wire                                                                            wCU2__ExecuteMicroCode;

wire  [`ROM_ADDRESS_WIDTH-1:0]   wIO2_MEM__InstructionWriteAddr;

wire [95:0]                                                      wMEM_2__EXE_DataRead0, wMEM_2__EXE_DataRead1,wMEM_2__IO_DataRead0, wMEM_2__IO_DataRead1;

wire [`DATA_ADDRESS_WIDTH-1:0]   wEXE_2__MEM_DataReadAddress0,wEXE_2__MEM_DataReadAddress1;

wire [`DATA_ADDRESS_WIDTH-1:0]   wUCODE_RAMReadAddress0,wUCODE_RAMReadAddress1;

wire [`WIDTH-1:0]                                        w2IO__AddressOffset;

wire [`DATA_ADDRESS_WIDTH-1:0]   w2IO__DataWriteAddress;

wire                                                                            w2IO__Store;

wire                                                                            w2IO__EnableWBMaster;

wire [`DATA_ADDRESS_WIDTH-1:0]   wIO2_MEM__DataWriteAddress;

wire [`DATA_ADDRESS_WIDTH-1:0]   wIO_2_MEM__DataReadAddress0;

wire [`DATA_ROW_WIDTH-1:0]               wIO2_MEM__Bus;

wire [`WIDTH-1:0]                                        wIO2_MEM__Data;

wire [`WIDTH-1:0]                                        wIO2_WBM__Address;

wire                                                                            wIO2_MEM__DataWriteEnable;

wire                                                                            wIO2__Done;

wire                                                                            wCU2_GEO__GeometryFetchEnable;

wire                                                                            wIFU2__MicroCodeReturnValue;

wire                                                                            wCU2_BCU__ACK;

wire                                                                            wGEO2_CU__RequestAABBIU;

wire                                                                            wGEO2_CU__RequestBIU;

wire                             wGEO2_CU__RequestTCC;

wire                                                                            wGEO2_CU__GeometryUnitDone;

wire                                                                            wGEO2_CU__Sync;

wire                                                                            wEXE2__uCodeDone;

wire                                                                            wEXE2_IFU__EXEBusy;

wire [`DATA_ADDRESS_WIDTH-1:0]   wEXE2_IDU_DataFordward_LastDestination;

wire                                                                            wALU2_EXE__BranchTaken;

wire                                                                            wALU2_IFU_BranchNotTaken;

wire                                                                            w2IO__SetAddress;

wire                                                                            wIDU2_IFU__IDUBusy;

//Control Registe wires

wire[15:0]                                                               wCR2_ControlRegister;

wire                                                                            wCR2_TextureMappingEnabled;

wire                             wGEO2_CU__TFFDone;

wire                             wCU2_GEO__TriggerTFF;

wire                             wIO2_MEM_InstructionWriteEnable;

wire                             wCU2_IO__WritePixel;

wire                             wGEO2_IO__AddrIsImm;

wire[31:0]                       wGEO2_IO__AddressOffset;

wire                             wGEO2_IO__EnableWBMaster;

wire                             wGEO2_IO__SetAddress;

wire[`WIDTH-1:0]                 wGEO2__CurrentPitch,wCU2_GEO_Pitch;

wire                             wCU2_GEO__SetPitch,wCU2_GEO__IncPicth;

wire wCU2_FlipMemEnabled;

wire w2MEM_FlipMemory;

`ifdef DEBUG

        wire [`ROM_ADDRESS_WIDTH-1:0] wDEBUG_IDU2_EXE_InstructionPointer;

`endif

//--------------------------------------------------------

assign wCR2_TextureMappingEnabled = wCR2_ControlRegister[ `CR_EN_TEXTURE ];

wire wCU2_FlipMem;

//--------------------------------------------------------

//Control Unit Instance

        ControlUnit CU

        (

           .Clock(Clock),

                .Reset(Reset),

                .oFlipMemEnabled(                   wCU2_FlipMemEnabled            ),

                .oFlipMem(                          wCU2_FlipMem                   ),

                .iControlRegister(                  wCR2_ControlRegister           ),

                .oRamBusOwner(                      RamBusOwner                    ),

                .oGFUEnable(                        wCU2_GEO__GeometryFetchEnable  ),

                .iTriggerAABBIURequest(             wGEO2_CU__RequestAABBIU        ),

                .iTriggerBIURequest(                wGEO2_CU__RequestBIU           ),

                .iTriggertTCCRequest(               wGEO2_CU__RequestTCC           ),

                .oUCodeEnable(                      wCU2__ExecuteMicroCode         ),

                .oCodeInstructioPointer(           InitialCodeAddress             ),

                .iUCodeDone(                        wCU2__MicrocodeExecutionDone   ),

                .iIODone(                           wIO2__Done                     ),

                .oIOWritePixel(                     wCU2_IO__WritePixel            ),

                .iUCodeReturnValue(                 wIFU2__MicroCodeReturnValue    ),

                .iGEOSync(                          wGEO2_CU__Sync                 ),

                .iTFFDone(                          wGEO2_CU__TFFDone              ),

                .oTriggerTFF(                       wCU2_GEO__TriggerTFF           ),

                .MST_I(                             MST_I                          ),

                .oSetCurrentPitch(                  wCU2_GEO__SetPitch             ),

                .iGFUDone(                          wGEO2_CU__GeometryUnitDone     ),

                .iRenderEnable(                     RENDREN_I                      ),

                `ifdef DEBUG

                .iDebug_CoreID( iDebug_CoreID ),

                `endif

                .oDone(                             DONE_O                         )

        );

//--------------------------------------------------------      

//assign w2MEM_FlipMemory =  (wCU2__ExecuteMicroCode | wCU2_FlipMem ) & wCU2_FlipMemEnabled;

assign w2MEM_FlipMemory =  wCU2_FlipMem  & wCU2_FlipMemEnabled;

MemoryUnit MEM

(

.Clock(Clock),

.Reset(Reset),

.iFlipMemory( w2MEM_FlipMemory ),

//Data Bus to/from EXE

.iDataReadAddress1_EXE(       wEXE_2__MEM_DataReadAddress0        ),

.iDataReadAddress2_EXE(       wEXE_2__MEM_DataReadAddress1        ),

.oData1_EXE(                  wMEM_2__EXE_DataRead0               ),

.oData2_EXE(                  wMEM_2__EXE_DataRead1               ),

.iDataWriteEnable_EXE(        wEXE_2__DataWriteEnable          ),

.iDataWriteAddress_EXE(       wEXE_2__MEM_wDataWriteAddress        ),

.iData_EXE(                   wEXE_2__MEM_WriteData          ),

//Data Bus to/from IO

.iDataReadAddress1_IO(       wIO_2_MEM__DataReadAddress0        ),

.iDataReadAddress2_IO(       wIO_2_MEM__DataReadAddress1        ),

.oData1_IO(                  wMEM_2__IO_DataRead0               ),

.oData2_IO(                  wMEM_2__IO_DataRead1               ),

.iDataWriteEnable_IO(        wIO2_MEM__DataWriteEnable          ),

.iDataWriteAddress_IO(       wIO2_MEM__DataWriteAddress        ),

.iData_IO(                   wIO2_MEM__Bus          ),

//Instruction Bus

.iInstructionReadAddress1(  wInstructionPointer1             ),

.iInstructionReadAddress2(  wInstructionPointer2             ),

.oInstruction1(             wEncodedInstruction1             ),

.oInstruction2(             wEncodedInstruction2             ),

.iInstructionWriteEnable(  wIO2_MEM_InstructionWriteEnable ),

.iInstructionWriteAddress( wIO2_MEM__InstructionWriteAddr  ),

.iInstruction(             wIO2_MEM__ExternalInstruction   ),

.iControlRegister(         CREG_I                          ),

.oControlRegister(         wCR2_ControlRegister            )

);

////--------------------------------------------------------

ExecutionUnit EXE

(

.Clock( Clock),

.Reset( Reset ),

.iInitialCodeAddress(    InitialCodeAddress     ),

.iInstruction1(          wEncodedInstruction1      ),

.iInstruction2(          wEncodedInstruction2      ),

.oInstructionPointer1(   wInstructionPointer1    ),

.oInstructionPointer2(   wInstructionPointer2    ),

.iDataRead0(             wMEM_2__EXE_DataRead0             ),

.iDataRead1(             wMEM_2__EXE_DataRead1             ),

.iTrigger(               wCU2__ExecuteMicroCode ),

.oDataReadAddress0( wEXE_2__MEM_DataReadAddress0 ),

.oDataReadAddress1( wEXE_2__MEM_DataReadAddress1 ),

.oDataWriteEnable(  wEXE_2__DataWriteEnable  ),

.oDataWriteAddress( wEXE_2__MEM_wDataWriteAddress      ),

.oDataBus(          wEXE_2__MEM_WriteData          ),

.oReturnCode(       wIFU2__MicroCodeReturnValue ),

`ifdef DEBUG

.iDebug_CoreID( iDebug_CoreID ),

`endif

.oDone(             wCU2__MicrocodeExecutionDone )

);

////--------------------------------------------------------

wire wGEO2__RequestingTextures;

wire w2IO_WriteBack_Set;

GeometryUnit GEO

(

                .Clock( Clock ),

                .Reset( Reset ),

                .iEnable(                     wCU2_GEO__GeometryFetchEnable       ),

                .iTexturingEnable(            wCR2_TextureMappingEnabled          ),

                //Wires from IO

                .iData_WBM(                                             wIO2_MEM__Data ),

                .iDataReady_WBM(                                        wIO2__Done ),

                //Wires to WBM

                .oAddressWBM_Imm(                               wGEO2_IO__AddressOffset                                 ),

                .oAddressWBM_fromMEM(         wGEO2_IO__Adr_O_Pointer             ),

                .oAddressWBM_IsImm(           wGEO2_IO__AddrIsImm                 ),

                .oEnable_WBM(                                           wGEO2_IO__EnableWBMaster                                ),

                .oSetAddressWBM(                                        wGEO2_IO__SetAddress                                            ),

                .oSetIOWriteBackAddr(         w2IO_WriteBack_Set                  ),

                //Wires to CU

                .oRequest_AABBIU(             wGEO2_CU__RequestAABBIU                ),

                .oRequest_BIU(                wGEO2_CU__RequestBIU                   ),

                .oRequest_TCC(                wGEO2_CU__RequestTCC                   ),

                .oTFFDone(                    wGEO2_CU__TFFDone                      ),

                //Wires to RAM-Bus MUX  

                .oRAMWriteAddress(                              w2IO__DataWriteAddress                                  ),

                .oRAMWriteEnable(                               w2IO__Store ),

                //Wires from Execution Unit

                .iMicrocodeExecutionDone(               wCU2__MicrocodeExecutionDone                            ),

                .iMicroCodeReturnValue(                 wIFU2__MicroCodeReturnValue                             ),

                .oSync(                                                         wGEO2_CU__Sync                                                                  ),

                .iTrigger_TFF(                wCU2_GEO__TriggerTFF                   ),

                .iBIUHit(                     wIFU2__MicroCodeReturnValue            ),

                .oRequestingTextures( wGEO2__RequestingTextures ),

                .oDone(                                                         wGEO2_CU__GeometryUnitDone                                      )

);

assign TGA_O = (wGEO2__RequestingTextures) ? 2'b1: 2'b0;

//---------------------------------------------------------------------------------------------------

wire[`DATA_ADDRESS_WIDTH-1:0] wIO_2_MEM__DataReadAddress1;

assign wEXE_2__MEM_DataReadAddress1 = (wCU2_IO__WritePixel == 0) ?  wUCODE_RAMReadAddress1 : wIO_2_MEM__DataReadAddress1;

assign w2IO__EnableWBMaster = (wCU2_IO__WritePixel == 0 ) ? wGEO2_IO__EnableWBMaster : wCU2_IO__WritePixel;

assign w2IO__AddrIsImm       = (wCU2_IO__WritePixel == 0 ) ? wGEO2_IO__AddrIsImm       : 1'b0;

assign w2IO__AddressOffset   = (wCU2_IO__WritePixel == 0 ) ? wGEO2_IO__AddressOffset   : 32'b0;

assign w2IO__Adr_O_Pointer      = (wCU2_IO__WritePixel == 0 ) ? wGEO2_IO__Adr_O_Pointer : `OREG_ADDR_O;

//assign w2IO__Adr_O_Pointer      = (wCU2_IO__WritePixel == 0 ) ? wGEO2_IO__Adr_O_Pointer : `CREG_PIXEL_2D_INITIAL_POSITION; 

wire w2IO_MasterCycleType;

assign w2IO_MasterCycleType = (wCU2_IO__WritePixel) ? `WB_SIMPLE_WRITE_CYCLE : `WB_SIMPLE_READ_CYCLE;

assign w2IO__SetAddress = (wCU2_IO__WritePixel == 0 )? wGEO2_IO__SetAddress : wCU2_GEO__SetPitch;

IO_Unit IO

(

 .Clock(               Clock                            ),

 .Reset(               Reset                            ),

 .iEnable(            w2IO__EnableWBMaster              ),

 .iBusCyc_Type(         w2IO_MasterCycleType            ),

 .iStore(              w2IO__Store                      ),

 .iAdr_DataWriteBack(    w2IO__DataWriteAddress         ),

 .iAdr_O_Set(      w2IO__SetAddress                     ),

 .iAdr_O_Imm(       w2IO__AddressOffset                 ),

 .iAdr_O_Type(      w2IO__AddrIsImm                     ),

 .iAdr_O_Pointer(  w2IO__Adr_O_Pointer                  ),

 .iReadDataBus(        wMEM_2__IO_DataRead0                       ),

 .iReadDataBus2(        wMEM_2__IO_DataRead1                       ),

 .iDat_O_Pointer(     `OREG_PIXEL_COLOR                 ),

 .oDataReadAddress(    wIO_2_MEM__DataReadAddress0      ),

 .oDataReadAddress2(   wIO_2_MEM__DataReadAddress1       ),

 .oDataWriteAddress(   wIO2_MEM__DataWriteAddress    ),

 .oDataBus(               wIO2_MEM__Bus                 ),

 .oInstructionBus(     wIO2_MEM__ExternalInstruction    ),

 .oDataWriteEnable(         wIO2_MEM__DataWriteEnable    ),

 .oData(                    wIO2_MEM__Data                       ),

 .oInstructionWriteEnable(  wIO2_MEM_InstructionWriteEnable ),

 .oInstructionWriteAddress( wIO2_MEM__InstructionWriteAddr ),

 .iWriteBack_Set( w2IO_WriteBack_Set ),

 .oDone(               wIO2__Done                       ),

 .MST_I( MST_I ),

  //Wish Bone Interface

.DAT_I( DAT_I ),

.DAT_O( DAT_O ),

.ACK_I( ACK_I & GNT_I ),

.ACK_O( ACK_O ),

.ADR_O( ADR_O ),

.ADR_I( ADR_I ),

.WE_O(  WE_O  ),

.WE_I(  WE_I  ),

.STB_O( STB_O ),

.STB_I( STB_I ),

.CYC_O( CYC_O ),

.TGA_I( TGA_I ),

.CYC_I( CYC_I ),

.GNT_I( GNT_I ),

.TGC_O( TGC_O )

);

//---------------------------------------------------------------------------------------------------

endmodule