Subversion Repositories theia_gpu

`timescale 1ns / 1ps

`include "aDefinitions.v"

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

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.

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

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

module ExecutionUnit

(

input wire                             Clock,

input wire                             Reset,

input wire [`ROM_ADDRESS_WIDTH-1:0]         iInitialCodeAddress,

input wire [`INSTRUCTION_WIDTH-1:0]      iInstruction1,

input wire [`INSTRUCTION_WIDTH-1:0]      iInstruction2,

input wire [`DATA_ROW_WIDTH-1:0]                 iDataRead0,

input wire [`DATA_ROW_WIDTH-1:0]       iDataRead1,

input wire                             iTrigger,

output wire [`ROM_ADDRESS_WIDTH-1:0]     oInstructionPointer1,

output wire [`ROM_ADDRESS_WIDTH-1:0]     oInstructionPointer2,

output wire [`DATA_ADDRESS_WIDTH-1:0]    oDataReadAddress0,

output wire [`DATA_ADDRESS_WIDTH-1:0]  oDataReadAddress1,

output wire                                                                     oDataWriteEnable,

output wire [`DATA_ADDRESS_WIDTH-1:0]    oDataWriteAddress,

output wire [`DATA_ROW_WIDTH-1:0]                oDataBus,

output wire                            oReturnCode,

output wire                            oDone

);

`ifdef DEBUG

        wire [`ROM_ADDRESS_WIDTH-1:0] wDEBUG_IDU2_EXE_InstructionPointer;

`endif

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 [`INSTRUCTION_WIDTH-1:0]    CurrentInstruction;

//wire                                                                          wIDU2_IFU__IDUBusy;

wire [`INSTRUCTION_OP_LENGTH-1:0]                                wOperation;

wire [`DATA_ROW_WIDTH-1:0] wSource0,wSource1;

wire [`DATA_ADDRESS_WIDTH-1:0] wDestination;

wire wInstructionAvailable;

//ALU wires

wire [`INSTRUCTION_OP_LENGTH-1:0]                ALU2Operation;

wire [`WIDTH-1:0]                                        ALU2ChannelA;

wire [`WIDTH-1:0]                                        ALU2ChannelB;

wire [`WIDTH-1:0]                                        ALU2ChannelC;

wire [`WIDTH-1:0]                                        ALU2ChannelD;

wire [`WIDTH-1:0]                                        ALU2ChannelE;

wire [`WIDTH-1:0]                                        ALU2ChannelF;

wire [`WIDTH-1:0]                                        ALU2ResultA;

wire [`WIDTH-1:0]                                        ALU2ResultB;

wire [`WIDTH-1:0]                                        ALU2ResultC;

wire                                                                            wEXE2_ALU__TriggerALU;

wire                                                                            ALU2OutputReady;

wire                                                                            w2FIU__BranchTaken;

wire    [`ROM_ADDRESS_WIDTH-1:0] JumpIp;

//wire wIDU2_IFU__InputsLatched;        

wire wEPU_Busy,wTriggerIFU;

wire [`ROM_ADDRESS_WIDTH-1:0] wEPU_IP,wIFU_IP,wCodeEntryPoint;

assign oInstructionPointer1 = (wEPU_Busy) ? wEPU_IP : wIFU_IP;

InstructionEntryPoint EPU

(

.Clock( Clock ),

.Reset( Reset ),

.iTrigger( iTrigger ),

.iInitialCodeAddress( iInitialCodeAddress ),

.iIMemInput(iInstruction1),

.oEPU_Busy(wEPU_Busy),

.oEntryPoint( wCodeEntryPoint ),

.oTriggerIFU( wTriggerIFU ),

.oInstructionAddr( wEPU_IP )

);

InstructionFetch IFU

(

.Clock( Clock                                  ),

.Reset( Reset                                  ),

.iTrigger(              wTriggerIFU            ),

.iInstruction1(         iInstruction1          ),

.iInstruction2(         iInstruction2          ),

.iInitialCodeAddress(   wCodeEntryPoint        ),

.iBranchTaken(          w2FIU__BranchTaken     ),

.oCurrentInstruction(   CurrentInstruction     ),

.oInstructionAvalable(  wInstructionAvailable  ),

.oIP(                   wIFU_IP                ),

.oIP2(                  oInstructionPointer2   ),

.iEXEDone(              ALU2OutputReady        ),

.oMicroCodeReturnValue( oReturnCode            ),

.oExecutionDone(        oDone                  )

);

/*

InstructionFetchUnit    IFU

(

        .Clock( Clock ),

        .Reset( Reset ),

        .iTrigger( wTriggerIFU ),

        .iInitialCodeAddress( wCodeEntryPoint ),

        .oCurrentInstruction( CurrentInstruction ),

        .oInstructionAvalable( wInstructionAvailable ),

        .oInstructionPointer1( wIFU_IP ),

        .iInstruction1( iInstruction1 ),

        .oExecutionDone( oDone ),

        .iBranchTaken( w2FIU__BranchTaken ),

        .iBranchNotTaken( wALU2_IFU_BranchNotTaken ),

        .iJumpIp( JumpIp ),

        .iIDUBusy( wIDU2_IFU__IDUBusy ),

        .iExeBusy( wEXE2_IFU__EXEBusy ),

        .iDecodeUnitLatchedValues( wIDU2_IFU__InputsLatched ),

        .oMicroCodeReturnValue( oReturnCode )

);

*/

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

wire wIDU2_EXE_DataReady;

wire wEXE2_IDU_ExeLatchedValues;

InstructionDecode IDU

(

        .Clock( Clock ),

        .Reset( Reset ),

        .iEncodedInstruction( CurrentInstruction ),

        .iInstructionAvailable( wInstructionAvailable ),

        .oRamAddress0( oDataReadAddress0 ),

        .oRamAddress1( oDataReadAddress1 ),

        .iRamValue0( iDataRead0 ),

        .iRamValue1( iDataRead1 ),

        .iLastDestination( wEXE2_IDU_DataFordward_LastDestination ),

        .iDataForward( {ALU2ResultA,ALU2ResultB,ALU2ResultC} ),

        //Outputs going to the ALU-FSM

        .oOperation( wOperation ),

        .oDestination( wDestination ),

        .oSource0( wSource0 ),

        .oSource1( wSource1  ),

        `ifdef DEBUG

        .iDebug_CurrentIP( oInstructionPointer1 ),

        .oDebug_CurrentIP( wDEBUG_IDU2_EXE_InstructionPointer ),

        `endif

        .oDataReadyForExe( wIDU2_EXE_DataReady )

);

ExecutionFSM     EXE

(

        .Clock( Clock ),

        .Reset( Reset | iTrigger ),  //New Sat Jun13

        .iDecodeDone( wIDU2_EXE_DataReady ),

        .iOperation( wOperation ),

        .iDestination( wDestination ),

        .iSource0( wSource0 ),

        .iSource1( wSource1 ) ,

        `ifdef DEBUG

                .iDebug_CurrentIP( wDEBUG_IDU2_EXE_InstructionPointer ),

        `endif

        //.iJumpResultFromALU( wALU2_EXE__BranchTaken ),

        .iBranchTaken( wALU2_EXE__BranchTaken ),

        .iBranchNotTaken( wALU2_IFU_BranchNotTaken ),

        .oJumpFlag( w2FIU__BranchTaken ),

        .oJumpIp( JumpIp ),

        .oRAMWriteEnable( oDataWriteEnable ),

        .oRAMWriteAddress( oDataWriteAddress ),

        .RAMBus( oDataBus ),

        .oBusy( wEXE2_IFU__EXEBusy ),

        .oExeLatchedValues( wEXE2_IDU_ExeLatchedValues ),

        .oLastDestination( wEXE2_IDU_DataFordward_LastDestination ),

        //ALU ports and control signals

        .oTriggerALU( wEXE2_ALU__TriggerALU ),

        .oALUOperation( ALU2Operation ),

        .oALUChannelX1( ALU2ChannelA ),

        .oALUChannelX2( ALU2ChannelB ),

        .oALUChannelY1( ALU2ChannelC ),

        .oALUChannelY2( ALU2ChannelD ),

        .oALUChannelZ1( ALU2ChannelE ),

        .oALUChannelZ2( ALU2ChannelF ),

        .iALUResultX( ALU2ResultA ),

        .iALUResultY( ALU2ResultB ),

        .iALUResultZ( ALU2ResultC ),

        .iALUOutputReady( ALU2OutputReady )

);

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

VectorALU ALU

(

        .Clock(Clock),

        .Reset(Reset),

        .iOperation( ALU2Operation ),

        .iChannel_Ax( ALU2ChannelA ),

        .iChannel_Bx( ALU2ChannelB ),

        .iChannel_Ay( ALU2ChannelC ),

        .iChannel_By( ALU2ChannelD ),

        .iChannel_Az( ALU2ChannelE ),

        .iChannel_Bz( ALU2ChannelF ),

        .oResultA( ALU2ResultA ),

        .oResultB( ALU2ResultB ),

        .oResultC( ALU2ResultC ),

        .oBranchTaken( wALU2_EXE__BranchTaken ),

        .oBranchNotTaken( wALU2_IFU_BranchNotTaken ),

        .iInputReady( wEXE2_ALU__TriggerALU ),

        .OutputReady( ALU2OutputReady )

);

endmodule

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