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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. ***********************************************************************************/ /* In order to read the geometry, we will behave as a master. Performing single Reads Bus cycles should be sufficient. Choosing 32 bit for bus width for simplicity. */ module WishBoneMasterUnit ( //WB Input signals input wire CLK_I, input wire RST_I, input wire ACK_I, input wire GNT_I, //granted signal from bus arbiter input wire [`WB_WIDTH-1:0 ] DAT_I, output wire [`WB_WIDTH-1:0] DAT_O, //WB Output Signals output wire [`WB_WIDTH-1:0 ] ADR_O, output wire WE_O, output wire STB_O, output wire CYC_O, output wire [1:0] TGC_O, //Signals from inside the GPU input wire iEnable, input wire iBusCyc_Type, input wire [`WIDTH-1:0 ] iAddress, input wire iAddress_Set, output wire oDataReady, input wire [`WIDTH-1:0 ] iData, output wire [`WIDTH-1:0 ] oData ); wire wReadOperation; wire wEnable; assign wEnable = iEnable & GNT_I; //If CYC_O is 1, it means we are requesting bus ownership assign CYC_O = iEnable; assign wReadOperation = (iBusCyc_Type == `WB_SIMPLE_READ_CYCLE) ? 1 : 0; assign WE_O = (iBusCyc_Type == `WB_SIMPLE_WRITE_CYCLE && wEnable) ? 1 : 0; wire wEnable_Delayed; FFD_POSEDGE_SYNCRONOUS_RESET # ( 1 ) FFD88 ( .Clock(CLK_I), .Reset(RST_I), .Enable(1'b1 ), .D(wEnable), .Q(wEnable_Delayed) ); //We only start Strobbing 1 cycle after iEnable and only //if iEnable is 1 and if GNT_I is 1 (meaning we own the bus) assign STB_O = wEnable_Delayed & ~ACK_I & wEnable; assign DAT_O = (wReadOperation | ~wEnable ) ? `WB_WIDTH'bz : iData; wire [`WB_WIDTH-1:0 ] wReadADR_O,wWriteADR_O; assign ADR_O = ( wReadOperation ) ? wReadADR_O : wWriteADR_O; //The ADR_O, it increments with each ACK_I, and it resets //to the value iAddress everytime iAddress_Set is 1. UPCOUNTER_POSEDGE # (`WIDTH) WBM_O_READ_ADDRESS ( .Clock(CLK_I), .Reset( iAddress_Set ), .Enable((ACK_I & GNT_I) | iAddress_Set), .Initial(iAddress), .Q(wReadADR_O) ); wire wDelayWE; FFD_POSEDGE_SYNCRONOUS_RESET # ( 1 ) FFD3 ( .Clock(CLK_I), .Reset(RST_I), .Enable(1'b1), .D(WE_O), .Q(wDelayWE) ); UPCOUNTER_POSEDGE # (`WIDTH) WBM_O_WRITE_ADDRESS ( .Clock(CLK_I), .Reset( iAddress_Set ),//RST_I ), .Enable( (wDelayWE & ACK_I ) | iAddress_Set), .Initial(iAddress),//`WIDTH'b0), .Q(wWriteADR_O) ); FFD_POSEDGE_SYNCRONOUS_RESET # ( `WIDTH ) FFD1 ( .Clock(ACK_I), .Reset(~wEnable), .Enable(wReadOperation ), .D(DAT_I), .Q(oData) ); wire wDelayDataReady; FFD_POSEDGE_SYNCRONOUS_RESET # ( 1 ) FFD2 ( .Clock(CLK_I), .Reset(~wEnable), .Enable(wReadOperation), .D(ACK_I), .Q(wDelayDataReady) ); /* always @ (posedge wDelayDataReady) begin $display("WBM Got data: %h ",oData); $display("oDataReady = %d",oDataReady ); end */ assign oDataReady = wDelayDataReady & wEnable; endmodule
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