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[/] [theia_gpu/] [branches/] [icarus_version/] [rtl/] [Module_MEM2WBM.v] - Rev 167
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`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. ***********************************************************************************/ /* This unit is used when the External Address that comes into IO is not a immediate value, ie. it is a value that we need to read from one of our internal memory locations. Since each internal memory locations contains 3 * 32bits slots, ie X,Y and Z parts of the memory location, then we make three requests for external data, one for every X Y and Z part of our internal registry.So, summarising, each internal memory location, stores 3 external memory addresses to request to WBM. Once the 3 data has been read from outside world, they will get stored back into 3 consecutive inernal memory addreses starting from iDataInitialStorageAddress */ //--------------------------------------------------------------------- module MEM2WBMUnitB ( input wire Clock, input wire Reset, input wire iEnable, //output reg oSetAddress, input wire[`DATA_ADDRESS_WIDTH-1:0] iMEMDataPointer, input wire[`DATA_ADDRESS_WIDTH-1:0] iMEMDataPointer2, output wire [`WIDTH-1:0] oReadDataElement, output wire [`WIDTH-1:0] oReadDataElement2, output wire[`DATA_ADDRESS_WIDTH-1:0] oDataReadAddress, //This tells MEM unit from wich address we want to read output wire[`DATA_ADDRESS_WIDTH-1:0] oDataReadAddress2, //This tells MEM unit from wich address we want to read input wire [`DATA_ROW_WIDTH-1:0] iReadDataBus, //This comes from the MEM unit input wire [`DATA_ROW_WIDTH-1:0] iReadDataBus2, //This comes from the MEM unit output wire oDataWriteEnable, output wire oDataWriteEnable2, output wire oDataAvailable, input wire iRequestNextElement, input wire[`DATA_ADDRESS_WIDTH-1:0] iDataInitialStorageAddress, //Initial address to store data ////######## output wire[`DATA_ADDRESS_WIDTH-1:0] oDataWriteAddress, //Were to store the values comming from WBM ////######## output wire oDone ); assign oDataWriteEnable2 = 0; assign oDataWriteEnable = 0; //We only read. wire [3:0] wXYZSelector; wire[`WIDTH-1:0] wValueFromBus,wLatchedValue; assign oDataReadAddress = iMEMDataPointer; assign oDataReadAddress2 = iMEMDataPointer2; assign oDone = wXYZSelector[3]; wire wLacthNow; wire iRequestNextElement_Delay; FFD_POSEDGE_SYNCRONOUS_RESET # (1) FFD32_x ( .Clock( Clock ), .Reset( Reset ), .Enable( 1'b1 ), .D( iRequestNextElement ), .Q( iRequestNextElement_Delay ) ); assign oDataAvailable = iEnable & ~iRequestNextElement_Delay & wLacthNow;// & ~oDone; FFD_POSEDGE_SYNCRONOUS_RESET # (1) FFD32_EnableDelay ( .Clock( Clock ), .Reset( Reset ), .Enable( 1'b1 ), .D( iEnable ), .Q( wLacthNow ) ); assign oDataWriteAddress = iDataInitialStorageAddress; SHIFTLEFT_POSEDGE #(4) SHL ( .Clock(iRequestNextElement | ~iEnable), .Enable(1'b1), .Reset(~iEnable | Reset ), .Initial(4'b1), .O(wXYZSelector) ); MUXFULLPARALELL_3SEL_WALKINGONE MUXA ( .Sel( wXYZSelector[2:0] ), .I2( iReadDataBus[63:32]), .I1( iReadDataBus[95:64]), .I3( iReadDataBus[31:0] ), .O1( oReadDataElement ) ); MUXFULLPARALELL_3SEL_WALKINGONE MUXA2 ( .Sel( wXYZSelector[2:0] ), .I2( iReadDataBus2[63:32]), .I1( iReadDataBus2[95:64]), .I3( iReadDataBus2[31:0] ), .O1( oReadDataElement2 ) ); endmodule //---------------------------------------------------------------------
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