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.
 
***********************************************************************************/
//------------------------------------------------------------------------------
//
//
//
//
//        Remarks: 
//            * TMI sends 3 read requests to the TMEM memory. The read requests has
//              read address equal iAddress[X_RNG], iAddress[Y_RNG] and iAddress[Z_RNG]
//              respectively.
//            * TMI will set oData == 1 once the bus cycle is complete (this can take
//              multiple clock cycles depending on the crossbar traffic
//            * TMI needs to have iEnable == 1 for the entire duration of the read bus cycle,
//              if the iEnable is set to zero before the bus transaction is complete then
//              read operation will fail and the read data will not be presented into
//              the oData output signal.
//
//------------------------------------------------------------------------------
module Module_TMemInterface
(
input wire Clock,
input wire Reset,		
input wire iEnable,
input wire [`DATA_ROW_WIDTH-1:0]     iAddress,
output wire [`DATA_ROW_WIDTH-1:0]    oData,
output wire oDone,
 
input wire 						   ACK_I,
input wire                    GNT_I, 
input wire [`WB_WIDTH-1:0 ] 	DAT_I,
 
//WB Output Signals
output wire [`WB_WIDTH-1:0 ] ADR_O,
output wire 				     WE_O,
output wire 				     STB_O,
output wire  				     CYC_O
 
 
);
 
wire [3:0] wCurrentWord;
wire wDone;
assign oDone = wDone;// & iEnable;
 
FFD_POSEDGE_SYNCRONOUS_RESET # ( 1 ) FFD_DONE
(
	.Clock(Clock),
	.Reset(Reset),
	.Enable( 1'b1 ),
	.D(wCurrentWord[3]),
	.Q(wDone)
);
 
 
//wire wShiftNow;
assign WE_O = 1'b0;	//we only read
assign CYC_O = iEnable;
 
 
 
wire[2:0] wLatchNow;
FFD_POSEDGE_SYNCRONOUS_RESET # ( 3 ) FFD_LATHCNOW
(
	.Clock(Clock),
	.Reset(Reset),
	.Enable( 1'b1 ),
	.D(wCurrentWord[2:0]),
	.Q(wLatchNow)
);
 
 
 
SHIFTLEFT_POSEDGE #(4) SHL
( 
  .Clock(Clock),
  .Enable(iEnable & GNT_I),//wShiftNow),			
  .Reset(Reset | ~iEnable ), 
  .Initial(4'b1), 
  .O(wCurrentWord)
 
);
 
MUXFULLPARALELL_3SEL_WALKINGONE # ( `WB_WIDTH ) MUX1
 (
	.Sel( wCurrentWord[2:0] ),
	.I3(iAddress[31:0]),
	.I2(iAddress[63:32]),
	.I1(iAddress[95:64]),
	.O1( ADR_O )
 );
 
 
 
FFD_POSEDGE_SYNCRONOUS_RESET # ( `WIDTH ) FFDX
(
	.Clock(Clock),
	.Reset(Reset),
	.Enable( wLatchNow[0] & GNT_I),
	.D(DAT_I),
	.Q(oData[95:64])
);
 
 
FFD_POSEDGE_SYNCRONOUS_RESET # ( `WIDTH ) FFDY
(
	.Clock(Clock),
	.Reset(Reset),
	.Enable( wLatchNow[1] & GNT_I),
	.D(DAT_I),
	.Q(oData[63:32])
);
 
 
FFD_POSEDGE_SYNCRONOUS_RESET # ( `WIDTH ) FFDZ
(
	.Clock(Clock),
	.Reset( Reset ),
	.Enable( wLatchNow[2] & GNT_I),
	.D(DAT_I),
	.Q(oData[31:0])
);
 
endmodule
//--------------------------------------------------------------------------