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