Subversion Repositories theia_gpu

`timescale 1ns / 1ps

`include "aDefinitions.v"

`define ADR_IMM 1

`define ADR_POINTER 0

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

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 IO_Unit

(

 input wire                            Clock,

 input wire                            Reset,

 input wire                            iEnable,

 input wire [`DATA_ADDRESS_WIDTH-1:0]  iDat_O_Pointer,     //Pointer to what we want to send via DAT_O

 input wire [`WIDTH-1:0]               iAdr_O_Imm,         //Value to assign to ADR_O

 input wire [`DATA_ADDRESS_WIDTH-1:0]  iAdr_O_Pointer,     //Pointer to value to assing to ADR_O

 input wire                            iAdr_O_Type,        //Should we use iAdr_O_Imm or iAdr_O_Pointer

 input wire                            iAdr_O_Set,                   //Should we set 

 input wire                            iBusCyc_Type,       //Bus cycle type: simple read/write, etc.

 input wire                            iStore,             //Should we store read data into MEM

 input wire [`DATA_ROW_WIDTH-1:0]      iReadDataBus,       //MEM Data read bus 1

 input wire [`DATA_ROW_WIDTH-1:0]      iReadDataBus2,      //MEM Data read bus 2

 input wire[`DATA_ADDRESS_WIDTH-1:0]   iAdr_DataWriteBack, //Where in MEM we want to store DAT_I

 input wire                            iWriteBack_Set,     //We want to set the Write back Address?

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

 output wire[`DATA_ADDRESS_WIDTH-1:0]  oDataReadAddress2,

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

 output wire                           oDataWriteEnable,

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

 output wire [`INSTRUCTION_WIDTH-1:0]  oInstructionBus,

 output wire                           oInstructionWriteEnable,

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

 inout wire [`WIDTH-1:0]               oData,

 output wire                           oDone,

 //Theia specific interfaces

 input wire MST_I,

 //Wish Bone Interfaces

output wire [31:0]   DAT_O,

input wire [31:0]    DAT_I,

input wire           ACK_I,

output wire          ACK_O,

output wire [31:0]   ADR_O,

output wire [31:0]   ADR_I,

output wire          WE_O,

input wire           WE_I,

output wire          STB_O,

input wire           STB_I,

output wire          CYC_O,

input wire           CYC_I,

input wire  [1:0]    TGA_I,

output wire     [1:0]    TGC_O,

input wire           GNT_I

);

wire [`WIDTH-1:0]          wMEMToWBM2__ReadDataElement;

wire [`WIDTH-1:0]          wMEMToWBM2__ReadDataElement2;

wire                       wMEMToWBM_2__Enable;

wire                       wWBMToMEM2__Done;

wire                       wWBM_2_WBMToMEM_DataAvailable;

wire [`WIDTH-1:0]          wWBM_2_WBMToMEM_Data;

wire [`WIDTH-1:0]          wWBS_2__WBMToMEM_Frame;

wire                       wWBMToMEM_2_WBM_Enable;

wire [`WIDTH-1:0]          wWBMToMEM_2_WBM_Address;

wire                       wWBMToMEM2__oDataWriteEnable;

wire                       wAddrerssSelector2_oDataWriteEnable;

wire [`DATA_ROW_WIDTH-1:0] wWBMToMEM2__oDataBus;

wire [`DATA_ROW_WIDTH-1:0] wWBSToMEM2__oDataBus;

wire                       wAddressSelector_2__SetAddress;

wire [`WIDTH-1:0]          wMEMToWBM_2__Address;

wire                       wMEMToWBM_2__Done;

wire                       w2WBMToMEM__Enable;

wire                       w2WBMToMEM__SetAddress;

wire                       wWBS_2__WBSToMEM_FrameAvailable;

wire[`WIDTH-1:0]           wWBS_2__WBMToMEM_Address;

wire                       wWBSToMEM2__oDataWriteEnable;

wire[`DATA_ADDRESS_WIDTH-1:0] wWBSToMEM2__oDataWriteAddress;

wire[`DATA_ADDRESS_WIDTH-1:0] wWBMToMEM2__oDataWriteAddress;

wire wReadOperation;

assign wReadOperation = (iBusCyc_Type == `WB_SIMPLE_WRITE_CYCLE) ? 0 : 1;

assign wMEMToWBM_2__Address    = ( iAdr_O_Type == `ADR_IMM ) ? iAdr_O_Imm  : wMEMToWBM2__ReadDataElement;

assign w2WBMToMEM__Enable    = ( iAdr_O_Type == `ADR_IMM ) ? iEnable       : wMEMToWBM_2__Enable;

//assign oDone                  = ( (iAdr_O_Type == `ADR_IMM) && !(iBusCyc_Type == `WB_SIMPLE_WRITE_CYCLE) ) 

//? wWBMToMEM2__Done : wMEMToWBM_2__Done;

//TODO: WHEN ADR_POINTER Then Done is not until we got the 3 values from X,Y,Z in iAdr_O_Pointer

assign oDone = (iBusCyc_Type == `WB_SIMPLE_WRITE_CYCLE || iAdr_O_Type == `ADR_POINTER ) ? wMEMToWBM_2__Done : wWBMToMEM2__Done;

assign oDataWriteEnable  = (MST_I == 1'b1) ? wWBSToMEM2__oDataWriteEnable : (wWBMToMEM2__oDataWriteEnable);// ^ wAddrerssSelector2_oDataWriteEnable);

assign oDataWriteAddress = (MST_I == 1'b1) ? wWBSToMEM2__oDataWriteAddress : wWBMToMEM2__oDataWriteAddress;

assign oDataBus          = (MST_I == 1'b1) ? wWBSToMEM2__oDataBus : wWBMToMEM2__oDataBus;

 wire [`DATA_ADDRESS_WIDTH-1:0] wMEMToWBM2_WBMToMEM_RAMWriteAddr;

 wire [`DATA_ADDRESS_WIDTH-1:0] w2WBMToMEM_MEMWriteAddress;

assign w2WBMToMEM_MEMWriteAddress = ( iAdr_O_Type == `ADR_IMM) ? iAdr_DataWriteBack : wMEMToWBM2_WBMToMEM_RAMWriteAddr;

wire w2MEMToWBM_BusOperationComplete;

assign w2MEMToWBM_BusOperationComplete = (iBusCyc_Type == `WB_SIMPLE_WRITE_CYCLE) ? ACK_I  :  wWBMToMEM2__Done;

wire [`DATA_ADDRESS_WIDTH-1:0] w2MEMToWBM_DataPointer;

assign w2MEMToWBM_DataPointer = (iBusCyc_Type == `WB_SIMPLE_WRITE_CYCLE) ? iDat_O_Pointer : iAdr_O_Pointer;

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

MEM2WBMUnitB MEMToWBM

(

.Clock(                        Clock                                           ),

.Reset(                        Reset                                           ),

.iEnable(                      iEnable & (~iAdr_O_Type | iBusCyc_Type)         ),

.iMEMDataPointer(           w2MEMToWBM_DataPointer                          ),

.iMEMDataPointer2(           iAdr_O_Pointer                          ),

.iReadDataBus(                 iReadDataBus                                                                     ),   //3 Elements comming from DMEM

.iReadDataBus2(                iReadDataBus2                                   ),

.oReadDataElement(             wMEMToWBM2__ReadDataElement                     ),       //1 out of 3 elements we read

.oReadDataElement2(            wMEMToWBM2__ReadDataElement2                     ),      //1 out of 3 elements we read

.oDataReadAddress(              oDataReadAddress                                ),

.oDataReadAddress2(              oDataReadAddress2                             ),

.oDataWriteEnable(              wAddrerssSelector2_oDataWriteEnable             ),   //Always zero

.oDataAvailable(              wMEMToWBM_2__Enable                             ),    //Data from MEM available

.iRequestNextElement(          w2MEMToWBM_BusOperationComplete                 ),

.iDataInitialStorageAddress(    iAdr_DataWriteBack                              ), ////########

.oDataWriteAddress(             wMEMToWBM2_WBMToMEM_RAMWriteAddr        ), ////########

.oDone(                        wMEMToWBM_2__Done                               )

);

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

wire [`DATA_ADDRESS_WIDTH-1:0] wTemp1;

 assign wWBMToMEM2__oDataWriteAddress = (iAdr_O_Type == `ADR_IMM) ? iAdr_DataWriteBack : wTemp1;

WBM2MEMUnit WBMToMEM

(

.Clock(                 Clock                                     ),

.Reset(                 Reset                                     ),

.iEnable(              w2WBMToMEM__Enable & (wReadOperation | MST_I)  ), //Don't write stuff to MEM unless is Read bus cycle

.iStore(                iStore | ~iAdr_O_Type                     ),

.iWriteBack_Set( iWriteBack_Set ),

.iAdr_DataWriteBack(w2WBMToMEM_MEMWriteAddress              ),

//.iAdr_DataWriteBack(      iAdr_DataWriteBack ),

.iWBMDataAvailable(     wWBM_2_WBMToMEM_DataAvailable             ),

.iWBMData(              wWBM_2_WBMToMEM_Data                      ),

.oDataBus(               wWBMToMEM2__oDataBus                     ),

.oData(                 oData                                     ),

.oEnableWBM(           wWBMToMEM_2_WBM_Enable                   ),

.oDataWriteAddress(      wTemp1            ),///*******************!!!!!!!!!!!!!!

.oDataWriteEnable(       wWBMToMEM2__oDataWriteEnable             ),

.oDone(                 wWBMToMEM2__Done                          )

);

wire [`WIDTH-1:0] wADR_O_InitialAddress;

assign wADR_O_InitialAddress = (iBusCyc_Type == `WB_SIMPLE_WRITE_CYCLE) ? wMEMToWBM2__ReadDataElement2 : wMEMToWBM_2__Address;

wire wIncrement_Address_O;

assign wIncrement_Address_O = iEnable & ACK_I;

wire                 wMEMToWBM2__Done;

wire                 wMEMToWBM2__Trigger;

wire[`WB_WIDTH-1:0]  wMEMToWBM_2_Data;

wire                 w2MEMToWBM__Trigger;

wire                 wWBM2_MEMToWBM_DataWriteDone;

wire w2WBM_iEnable;

assign w2WBM_iEnable = (iBusCyc_Type == `WB_SIMPLE_WRITE_CYCLE) ? wMEMToWBM_2__Enable : iEnable;

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

wire wSTB_O;

//If the address is a pointer, we need 1 cycle to read the data back from MEM

//before we can the set the value into WBM

wire wAddress_Set_Delayed;

FFD_POSEDGE_SYNCRONOUS_RESET # (1) FFD32_SetDelay

(

        .Clock(         Clock ),

        .Reset(         Reset ),

        .Enable( 1'b1 ),

        .D( iAdr_O_Set ),

        .Q( wAddress_Set_Delayed )

);

//If the Addr is IMM then just set it whenever iAdr_O_Set is set, but if we have a pointer, then use

//wAddress_Set_Delayed at the beginning and then wWBMToMEM2__Done

wire wWBM_iAddress_Set = (iAdr_O_Type == `ADR_POINTER) ? (wAddress_Set_Delayed | wWBMToMEM2__Done) :    iAdr_O_Set;

assign STB_O = wSTB_O & ~oDone;

        WishBoneMasterUnit WBM

        (

                .CLK_I(         Clock ),

                .RST_I(         Reset ),

                .DAT_I(         DAT_I ),

                .DAT_O(  DAT_O ),

                .ACK_I(         ACK_I  ),

                .ADR_O(         ADR_O ),

                .WE_O(  WE_O ),

                .STB_O( wSTB_O ),

                .CYC_O( CYC_O   ),

                .TGC_O( TGC_O   ),

                .GNT_I(  GNT_I ),

                .iEnable(                       w2WBM_iEnable       ),

                .iBusCyc_Type(    iBusCyc_Type                     ),

                .iAddress_Set(  wWBM_iAddress_Set  ),

                .iAddress(            wADR_O_InitialAddress            ),

                .oDataReady(            wWBM_2_WBMToMEM_DataAvailable    ),

                .iData(           wMEMToWBM2__ReadDataElement      ),

                .oData(                                 wWBM_2_WBMToMEM_Data                       )

        );

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

WishBoneSlaveUnit WBS

(

                .CLK_I(         Clock  ),

                .RST_I(         Reset  ),

                .STB_I(  STB_I  ),

           .WE_I(   WE_I   ),

                .DAT_I(  DAT_I  ),

           .ADR_I(  ADR_I  ),

                .TGA_I(  TGA_I  ),

                .ACK_O(  ACK_O  ),

                .CYC_I(  CYC_I  ),

                .MST_I(  MST_I ),

                .oDataBus(               wWBSToMEM2__oDataBus                    ),

                .oInstructionBus(        oInstructionBus                         ),

                .oDataWriteAddress(      wWBSToMEM2__oDataWriteAddress           ),

                .oDataWriteEnable(       wWBSToMEM2__oDataWriteEnable            ),

                .oInstructionWriteAddress(      oInstructionWriteAddress         ),

                .oInstructionWriteEnable(       oInstructionWriteEnable          )

);

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

endmodule

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