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// File        : ../RTL/hostController/hctxportarbiter.v

// Generated   : 11/10/06 05:37:22

// From        : ../RTL/hostController/hctxportarbiter.asf

// By          : FSM2VHDL ver. 5.0.0.9

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

////                                                              ////

//// hctxPortArbiter

////                                                              ////

//// 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"

module HCTxPortArbiter (HCTxPortCntl, HCTxPortData, HCTxPortWEnable, SOFCntlCntl, SOFCntlData, SOFCntlGnt, SOFCntlReq, SOFCntlWEn, clk, directCntlCntl, directCntlData, directCntlGnt, directCntlReq, directCntlWEn, rst, sendPacketCntl, sendPacketData, sendPacketGnt, sendPacketReq, sendPacketWEn);

input   [7:0] SOFCntlCntl;

input   [7:0] SOFCntlData;

input   SOFCntlReq;

input   SOFCntlWEn;

input   clk;

input   [7:0] directCntlCntl;

input   [7:0] directCntlData;

input   directCntlReq;

input   directCntlWEn;

input   rst;

input   [7:0] sendPacketCntl;

input   [7:0] sendPacketData;

input   sendPacketReq;

input   sendPacketWEn;

output  [7:0] HCTxPortCntl;

output  [7:0] HCTxPortData;

output  HCTxPortWEnable;

output  SOFCntlGnt;

output  directCntlGnt;

output  sendPacketGnt;

reg     [7:0] HCTxPortCntl, next_HCTxPortCntl;

reg     [7:0] HCTxPortData, next_HCTxPortData;

reg     HCTxPortWEnable, next_HCTxPortWEnable;

wire    [7:0] SOFCntlCntl;

wire    [7:0] SOFCntlData;

reg     SOFCntlGnt, next_SOFCntlGnt;

wire    SOFCntlReq;

wire    SOFCntlWEn;

wire    clk;

wire    [7:0] directCntlCntl;

wire    [7:0] directCntlData;

reg     directCntlGnt, next_directCntlGnt;

wire    directCntlReq;

wire    directCntlWEn;

wire    rst;

wire    [7:0] sendPacketCntl;

wire    [7:0] sendPacketData;

reg     sendPacketGnt, next_sendPacketGnt;

wire    sendPacketReq;

wire    sendPacketWEn;

// Constants

`define DIRECT_CTRL_MUX 2'b10

`define SEND_PACKET_MUX 2'b00

`define SOF_CTRL_MUX 2'b01

// diagram signals declarations

reg  [1:0]muxCntl, next_muxCntl;

// BINARY ENCODED state machine: HCTxArb

// State codes definitions:

`define START_HARB 3'b000

`define WAIT_REQ 3'b001

`define SEND_SOF 3'b010

`define SEND_PACKET 3'b011

`define DIRECT_CONTROL 3'b100

reg [2:0] CurrState_HCTxArb;

reg [2:0] NextState_HCTxArb;

// Diagram actions (continuous assignments allowed only: assign ...)

// SOFController/directContol/sendPacket mux

always @(muxCntl or SOFCntlWEn or SOFCntlData or SOFCntlCntl or

                                 directCntlWEn or directCntlData or directCntlCntl or

                  directCntlWEn or directCntlData or directCntlCntl or

                                 sendPacketWEn or sendPacketData or sendPacketCntl)

begin

case (muxCntl)

    `SOF_CTRL_MUX :

    begin

        HCTxPortWEnable <= SOFCntlWEn;

        HCTxPortData <= SOFCntlData;

        HCTxPortCntl <= SOFCntlCntl;

    end

    `DIRECT_CTRL_MUX :

    begin

        HCTxPortWEnable <= directCntlWEn;

        HCTxPortData <= directCntlData;

        HCTxPortCntl <= directCntlCntl;

    end

    `SEND_PACKET_MUX :

    begin

        HCTxPortWEnable <= sendPacketWEn;

        HCTxPortData <= sendPacketData;

        HCTxPortCntl <= sendPacketCntl;

    end

    default :

    begin

        HCTxPortWEnable <= 1'b0;

        HCTxPortData <= 8'h00;

        HCTxPortCntl <= 8'h00;

    end

endcase

end

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

// Machine: HCTxArb

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

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

// Next State Logic (combinatorial)

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

always @ (SOFCntlReq or sendPacketReq or directCntlReq or SOFCntlGnt or muxCntl or sendPacketGnt or directCntlGnt or CurrState_HCTxArb)

begin : HCTxArb_NextState

  NextState_HCTxArb <= CurrState_HCTxArb;

  // Set default values for outputs and signals

  next_SOFCntlGnt <= SOFCntlGnt;

  next_muxCntl <= muxCntl;

  next_sendPacketGnt <= sendPacketGnt;

  next_directCntlGnt <= directCntlGnt;

  case (CurrState_HCTxArb)

    `START_HARB:

      NextState_HCTxArb <= `WAIT_REQ;

    `WAIT_REQ:

      if (SOFCntlReq == 1'b1)

      begin

        NextState_HCTxArb <= `SEND_SOF;

        next_SOFCntlGnt <= 1'b1;

        next_muxCntl <= `SOF_CTRL_MUX;

      end

      else if (sendPacketReq == 1'b1)

      begin

        NextState_HCTxArb <= `SEND_PACKET;

        next_sendPacketGnt <= 1'b1;

        next_muxCntl <= `SEND_PACKET_MUX;

      end

      else if (directCntlReq == 1'b1)

      begin

        NextState_HCTxArb <= `DIRECT_CONTROL;

        next_directCntlGnt <= 1'b1;

        next_muxCntl <= `DIRECT_CTRL_MUX;

      end

    `SEND_SOF:

      if (SOFCntlReq == 1'b0)

      begin

        NextState_HCTxArb <= `WAIT_REQ;

        next_SOFCntlGnt <= 1'b0;

      end

    `SEND_PACKET:

      if (sendPacketReq == 1'b0)

      begin

        NextState_HCTxArb <= `WAIT_REQ;

        next_sendPacketGnt <= 1'b0;

      end

    `DIRECT_CONTROL:

      if (directCntlReq == 1'b0)

      begin

        NextState_HCTxArb <= `WAIT_REQ;

        next_directCntlGnt <= 1'b0;

      end

  endcase

end

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

// Current State Logic (sequential)

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

always @ (posedge clk)

begin : HCTxArb_CurrentState

  if (rst)

    CurrState_HCTxArb <= `START_HARB;

  else

    CurrState_HCTxArb <= NextState_HCTxArb;

end

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

// Registered outputs logic

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

always @ (posedge clk)

begin : HCTxArb_RegOutput

  if (rst)

  begin

    muxCntl <= 2'b00;

    SOFCntlGnt <= 1'b0;

    sendPacketGnt <= 1'b0;

    directCntlGnt <= 1'b0;

  end

  else

  begin

    muxCntl <= next_muxCntl;

    SOFCntlGnt <= next_SOFCntlGnt;

    sendPacketGnt <= next_sendPacketGnt;

    directCntlGnt <= next_directCntlGnt;

  end

end

endmodule