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// File        : ../RTL/hostController/sofcontroller.v

// Generated   : 11/10/06 05:37:21

// From        : ../RTL/hostController/sofcontroller.asf

// By          : FSM2VHDL ver. 5.0.0.9

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// sofcontroller

////                                                              ////

//// This file is part of the usbhostslave opencores effort.

//// http://www.opencores.org/cores/usbhostslave/                 ////

////                                                              ////

//// Module Description:                                          ////

//// 

////                                                              ////

//// To Do:                                                       ////

//// 

////                                                              ////

//// Author(s):                                                   ////

//// - Steve Fielding, sfielding@base2designs.com                 ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2004 Steve Fielding and OPENCORES.ORG          ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

////                                                              ////

//// This source 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 Lesser General Public License for more  ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

//

`include "timescale.v"

`include "usbhostslave_serialinterfaceengine_h.v"

module SOFController (HCTxPortCntl, HCTxPortData, HCTxPortGnt, HCTxPortRdy, HCTxPortReq, HCTxPortWEn, SOFEnable, SOFTimerClr, SOFTimer, clk, rst);

input   HCTxPortGnt;

input   HCTxPortRdy;

input   SOFEnable;

input   SOFTimerClr;

input   clk;

input   rst;

output  [7:0] HCTxPortCntl;

output  [7:0] HCTxPortData;

output  HCTxPortReq;

output  HCTxPortWEn;

output  [15:0] SOFTimer;

reg     [7:0] HCTxPortCntl, next_HCTxPortCntl;

reg     [7:0] HCTxPortData, next_HCTxPortData;

wire    HCTxPortGnt;

wire    HCTxPortRdy;

reg     HCTxPortReq, next_HCTxPortReq;

reg     HCTxPortWEn, next_HCTxPortWEn;

wire    SOFEnable;

wire    SOFTimerClr;

reg     [15:0] SOFTimer, next_SOFTimer;

wire    clk;

wire    rst;

// BINARY ENCODED state machine: sofCntl

// State codes definitions:

`define START_SC 3'b000

`define WAIT_SOF_EN 3'b001

`define WAIT_SEND_RESUME 3'b010

`define INC_TIMER 3'b011

`define SC_WAIT_GNT 3'b100

`define CLR_WEN 3'b101

reg [2:0] CurrState_sofCntl;

reg [2:0] NextState_sofCntl;

//--------------------------------------------------------------------

// Machine: sofCntl

//--------------------------------------------------------------------

//----------------------------------

// Next State Logic (combinatorial)

//----------------------------------

always @ (SOFTimerClr or SOFTimer or SOFEnable or HCTxPortRdy or HCTxPortGnt or HCTxPortReq or HCTxPortWEn or HCTxPortData or HCTxPortCntl or CurrState_sofCntl)

begin : sofCntl_NextState

  NextState_sofCntl <= CurrState_sofCntl;

  // Set default values for outputs and signals

  next_HCTxPortReq <= HCTxPortReq;

  next_HCTxPortWEn <= HCTxPortWEn;

  next_HCTxPortData <= HCTxPortData;

  next_HCTxPortCntl <= HCTxPortCntl;

  next_SOFTimer <= SOFTimer;

  case (CurrState_sofCntl)

    `START_SC:

      NextState_sofCntl <= `WAIT_SOF_EN;

    `WAIT_SOF_EN:

      if (SOFEnable == 1'b1)

      begin

        NextState_sofCntl <= `SC_WAIT_GNT;

        next_HCTxPortReq <= 1'b1;

      end

    `WAIT_SEND_RESUME:

      if (HCTxPortRdy == 1'b1)

      begin

        NextState_sofCntl <= `CLR_WEN;

        next_HCTxPortWEn <= 1'b1;

        next_HCTxPortData <= 8'h00;

        next_HCTxPortCntl <= `TX_RESUME_START;

      end

    `INC_TIMER:

    begin

      next_HCTxPortReq <= 1'b0;

      if (SOFTimerClr == 1'b1)

        next_SOFTimer <= 16'h0000;

      else

        next_SOFTimer <= SOFTimer + 1'b1;

      if (SOFEnable == 1'b0)

      begin

        NextState_sofCntl <= `WAIT_SOF_EN;

        next_SOFTimer <= 16'h0000;

      end

    end

    `SC_WAIT_GNT:

      if (HCTxPortGnt == 1'b1)

        NextState_sofCntl <= `WAIT_SEND_RESUME;

    `CLR_WEN:

    begin

      next_HCTxPortWEn <= 1'b0;

      NextState_sofCntl <= `INC_TIMER;

    end

  endcase

end

//----------------------------------

// Current State Logic (sequential)

//----------------------------------

always @ (posedge clk)

begin : sofCntl_CurrentState

  if (rst)

    CurrState_sofCntl <= `START_SC;

  else

    CurrState_sofCntl <= NextState_sofCntl;

end

//----------------------------------

// Registered outputs logic

//----------------------------------

always @ (posedge clk)

begin : sofCntl_RegOutput

  if (rst)

  begin

    SOFTimer <= 16'h0000;

    HCTxPortCntl <= 8'h00;

    HCTxPortData <= 8'h00;

    HCTxPortWEn <= 1'b0;

    HCTxPortReq <= 1'b0;

  end

  else

  begin

    SOFTimer <= next_SOFTimer;

    HCTxPortCntl <= next_HCTxPortCntl;

    HCTxPortData <= next_HCTxPortData;

    HCTxPortWEn <= next_HCTxPortWEn;

    HCTxPortReq <= next_HCTxPortReq;

  end

end

endmodule