Subversion Repositories theia_gpu

`timescale 1ns / 1ps
`include "aDefinitions.v"
 
//---------------------------------------------------------------
module WBMaster
(
	input wire Clock,
	input wire Reset,
	input wire iEnable,
	input wire iShortFlow,
	input wire [`WB_WIDTH-1:0]  iInitialReadAddr,
	input wire [`WB_WIDTH-1:0]  iWriteAddr,
	output wire [`WB_WIDTH-1:0] oReadAddress,
	input wire [`WB_WIDTH-1:0]  iReadData,
 
	output reg  STB_O,
	input wire   ACK_I,
	output wire  CYC_O,
	output wire [`WB_WIDTH-1:0] DAT_O,
	output wire [`WB_WIDTH-1:0] ADR_O,
	output wire oDone
);
 
	assign ADR_O = iWriteAddr;
	wire [3:0] wXYZSel_Long;
	wire [2:0] wXYZSel_Short;
 
	UPCOUNTER_POSEDGE # (`WB_WIDTH) WBM_O_READ_ADDRESS
	(
	.Clock(Clock), 
	.Reset( Reset ),
	.Enable(iEnable & ACK_I),
	.Initial(iInitialReadAddr),
	.Q(oReadAddress)
	);
 
	CIRCULAR_SHIFTLEFT_POSEDGE #(4) SHL
	( 
  .Clock(Clock),
  .Enable(ACK_I & iEnable),
  .Reset( Reset ), 
  .Initial(4'b1), 
  .O(wXYZSel_Long)
 
	);
	CIRCULAR_SHIFTLEFT_POSEDGE #(3) SHL2
	( 
  .Clock(Clock),
  .Enable(ACK_I & iEnable),
  .Reset( Reset ), 
  .Initial(3'b1), 
  .O(wXYZSel_Short)
 
	);
 
	//`ifdef VERILATOR
		wire wDone = (iShortFlow) ? wXYZSel_Short[2] : wXYZSel_Long[3];
		//Adding FFD to break combinatorial loop.
		//Host::wShortCycle -> WBM::iShortCycle -> WBM::wDone -> Host::wWBMDone -> Host::always ->Host::oMemSelect -> Host::wShortCycle
		FFD_POSEDGE_SYNCRONOUS_RESET # ( 1 ) FFD_DONE
        (
	      .Clock(Clock),
	      .Reset(Reset),
	      .Enable( 1'b1 ),
	      .D(wDone),
	      .Q(oDone)
        );
	//`else
	//	assign oDone = (iShortFlow) ? wXYZSel_Short[2] : wXYZSel_Long[3];
	//`endif	
 
	assign DAT_O = iReadData;
 
	assign CYC_O = iEnable;
 
	always @ (posedge Clock)
	begin
	if (iEnable )
		STB_O <= ~ACK_I;
	else
		STB_O <= 0;
	end
 
 
endmodule