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

////                                                              ////

//// USBHostControlBI.v                                           ////

////                                                              ////

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

//// <http://www.opencores.org/cores//>                           ////

////                                                              ////

//// 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 "usbHostControl_h.v"

module USBHostControlBI_simlib (address, dataIn, dataOut, writeEn,

  strobe_i,

  busClk,

  rstSyncToBusClk,

  usbClk,

  rstSyncToUsbClk,

  SOFSentIntOut, connEventIntOut, resumeIntOut, transDoneIntOut,

  TxTransTypeReg, TxSOFEnableReg,

  TxAddrReg, TxEndPReg, frameNumIn,

  RxPktStatusIn, RxPIDIn,

  connectStateIn,

  SOFSentIn, connEventIn, resumeIntIn, transDoneIn,

  hostControlSelect,

  clrTransReq,

  preambleEn,

  SOFSync,

  TxLineState,

  LineDirectControlEn,

  fullSpeedPol,

  fullSpeedRate,

  transReq,

  isoEn,

  SOFTimer

  );

input [3:0] address;

input [7:0] dataIn;

input writeEn;

input strobe_i;

input busClk;

input rstSyncToBusClk;

input usbClk;

input rstSyncToUsbClk;

output [7:0] dataOut;

output SOFSentIntOut;

output connEventIntOut;

output resumeIntOut;

output transDoneIntOut;

output [1:0] TxTransTypeReg;

output TxSOFEnableReg;

output [6:0] TxAddrReg;

output [3:0] TxEndPReg;

input [10:0] frameNumIn;

input [7:0] RxPktStatusIn;

input [3:0] RxPIDIn;

input [1:0] connectStateIn;

input SOFSentIn;

input connEventIn;

input resumeIntIn;

input transDoneIn;

input hostControlSelect;

input clrTransReq;

output preambleEn;

output SOFSync;

output [1:0] TxLineState;

output LineDirectControlEn;

output fullSpeedPol;

output fullSpeedRate;

output transReq;

output isoEn;     //enable isochronous mode

input [15:0] SOFTimer;

wire [3:0] address;

wire [7:0] dataIn;

wire writeEn;

wire strobe_i;

wire busClk;

wire rstSyncToBusClk;

wire usbClk;

wire rstSyncToUsbClk;

reg [7:0] dataOut;

reg SOFSentIntOut;

reg connEventIntOut;

reg resumeIntOut;

reg transDoneIntOut;

reg [1:0] TxTransTypeReg;

reg [1:0] TxTransTypeReg_reg1;

reg TxSOFEnableReg;

reg TxSOFEnableReg_reg1;

reg [6:0] TxAddrReg;

reg [6:0] TxAddrReg_reg1;

reg [3:0] TxEndPReg;

reg [3:0] TxEndPReg_reg1;

wire [10:0] frameNumIn;

wire [7:0] RxPktStatusIn;

wire [3:0] RxPIDIn;

wire [1:0] connectStateIn;

wire SOFSentIn;

wire connEventIn;

wire resumeIntIn;

wire transDoneIn;

wire hostControlSelect;

wire clrTransReq;

reg preambleEn;

reg preambleEn_reg1;

reg SOFSync;

reg SOFSync_reg1;

reg [1:0] TxLineState;

reg [1:0] TxLineState_reg1;

reg LineDirectControlEn;

reg LineDirectControlEn_reg1;

reg fullSpeedPol;

reg fullSpeedPol_reg1;

reg fullSpeedRate;

reg fullSpeedRate_reg1;

reg transReq;

reg transReq_reg1;

reg isoEn;

reg isoEn_reg1;

wire [15:0] SOFTimer;

//internal wire and regs

reg [1:0] TxControlReg;

reg [4:0] TxLineControlReg;

reg clrSOFReq;

reg clrConnEvtReq;

reg clrResInReq;

reg clrTransDoneReq;

reg SOFSentInt;

reg connEventInt;

reg resumeInt;

reg transDoneInt;

reg [3:0] interruptMaskReg;

reg setTransReq;

reg [2:0] resumeIntInExtend;

reg [2:0] transDoneInExtend;

reg [2:0] connEventInExtend;

reg [2:0] SOFSentInExtend;

reg [2:0] clrTransReqExtend;

//clock domain crossing sync registers

//STB = Sync To Busclk

reg [1:0] TxTransTypeRegSTB;

reg TxSOFEnableRegSTB;

reg [6:0] TxAddrRegSTB;

reg [3:0] TxEndPRegSTB;

reg preambleEnSTB;

reg SOFSyncSTB;

reg [1:0] TxLineStateSTB;

reg LineDirectControlEnSTB;

reg fullSpeedPolSTB;

reg fullSpeedRateSTB;

reg transReqSTB;

reg isoEnSTB;

reg [10:0] frameNumInSTB;

reg [10:0] frameNumInSTB_reg1;

reg [7:0] RxPktStatusInSTB;

reg [7:0] RxPktStatusInSTB_reg1;

reg [3:0] RxPIDInSTB;

reg [3:0] RxPIDInSTB_reg1;

reg [1:0] connectStateInSTB;

reg [1:0] connectStateInSTB_reg1;

reg [2:0] SOFSentInSTB;

reg [2:0] connEventInSTB;

reg [2:0] resumeIntInSTB;

reg [2:0] transDoneInSTB;

reg [2:0] clrTransReqSTB;

reg [15:0] SOFTimerSTB;

reg [15:0] SOFTimerSTB_reg1;

//sync write demux

always @(posedge busClk)

begin

  if (rstSyncToBusClk == 1'b1) begin

    isoEnSTB <= 1'b0;

    preambleEnSTB <= 1'b0;

    SOFSyncSTB <= 1'b0;

    TxTransTypeRegSTB <= 2'b00;

    TxLineControlReg <= 5'h00;

    TxSOFEnableRegSTB <= 1'b0;

    TxAddrRegSTB <= 7'h00;

    TxEndPRegSTB <= 4'h0;

    interruptMaskReg <= 4'h0;

  end

  else begin

    clrSOFReq <= 1'b0;

    clrConnEvtReq <= 1'b0;

    clrResInReq <= 1'b0;

    clrTransDoneReq <= 1'b0;

    setTransReq <= 1'b0;

    if (writeEn == 1'b1 && strobe_i == 1'b1 && hostControlSelect == 1'b1)

    begin

      case (address)

        `TX_CONTROL_REG : begin

          isoEnSTB <= dataIn[`ISO_ENABLE_BIT];

          preambleEnSTB <= dataIn[`PREAMBLE_ENABLE_BIT];

          SOFSyncSTB <= dataIn[`SOF_SYNC_BIT];

          setTransReq <= dataIn[`TRANS_REQ_BIT];

        end

        `TX_TRANS_TYPE_REG : TxTransTypeRegSTB <= dataIn[1:0];

        `TX_LINE_CONTROL_REG : TxLineControlReg <= dataIn[4:0];

        `TX_SOF_ENABLE_REG : TxSOFEnableRegSTB <= dataIn[`SOF_EN_BIT];

        `TX_ADDR_REG : TxAddrRegSTB <= dataIn[6:0];

        `TX_ENDP_REG : TxEndPRegSTB <= dataIn[3:0];

        `INTERRUPT_STATUS_REG :  begin

          clrSOFReq <= dataIn[`SOF_SENT_BIT];

          clrConnEvtReq <= dataIn[`CONNECTION_EVENT_BIT];

          clrResInReq <= dataIn[`RESUME_INT_BIT];

          clrTransDoneReq <= dataIn[`TRANS_DONE_BIT];

        end

        `INTERRUPT_MASK_REG  : interruptMaskReg <= dataIn[3:0];

      endcase

    end

  end

end

//interrupt control

always @(posedge busClk)

begin

  if (rstSyncToBusClk == 1'b1) begin

    SOFSentInt <= 1'b0;

    connEventInt <= 1'b0;

    resumeInt <= 1'b0;

    transDoneInt <= 1'b0;

  end

  else begin

    if (SOFSentInSTB[1] == 1'b1 && SOFSentInSTB[0] == 1'b0)

      SOFSentInt <= 1'b1;

    else if (clrSOFReq == 1'b1)

      SOFSentInt <= 1'b0;

    if (connEventInSTB[1] == 1'b1 && connEventInSTB[0] == 1'b0)

      connEventInt <= 1'b1;

    else if (clrConnEvtReq == 1'b1)

      connEventInt <= 1'b0;

    if (resumeIntInSTB[1] == 1'b1 && resumeIntInSTB[0] == 1'b0)

      resumeInt <= 1'b1;

    else if (clrResInReq == 1'b1)

      resumeInt <= 1'b0;

    if (transDoneInSTB[1] == 1'b1 && transDoneInSTB[0] == 1'b0)

      transDoneInt <= 1'b1;

    else if (clrTransDoneReq == 1'b1)

      transDoneInt <= 1'b0;

  end

end

//mask interrupts

always @(*) begin

  transDoneIntOut <= transDoneInt & interruptMaskReg[`TRANS_DONE_BIT];

  resumeIntOut <= resumeInt & interruptMaskReg[`RESUME_INT_BIT];

  connEventIntOut <= connEventInt & interruptMaskReg[`CONNECTION_EVENT_BIT];

  SOFSentIntOut <= SOFSentInt & interruptMaskReg[`SOF_SENT_BIT];

end

//transaction request set/clear

//Since 'busClk' can be a higher freq than 'usbClk',

//'setTransReq' must be delayed with respect to other control signals, thus

//ensuring that control signals have been clocked through to 'usbClk' clock

//domain before the transaction request is asserted.

//Not sure this is required because there is at least two 'usbClk' ticks between

//detection of 'transReq' and sampling of related control signals.

always @(posedge busClk)

begin

  if (rstSyncToBusClk == 1'b1) begin

    transReqSTB <= 1'b0;

  end

  else begin

    if (setTransReq == 1'b1)

      transReqSTB <= 1'b1;

    else if (clrTransReqSTB[1] == 1'b1 && clrTransReqSTB[0] == 1'b0)

      transReqSTB <= 1'b0;

  end

end

//break out control signals

always @(*) begin

  TxLineStateSTB <= TxLineControlReg[`TX_LINE_STATE_MSBIT:`TX_LINE_STATE_LSBIT];

  LineDirectControlEnSTB <= TxLineControlReg[`DIRECT_CONTROL_BIT];

  fullSpeedPolSTB <= TxLineControlReg[`FULL_SPEED_LINE_POLARITY_BIT];

  fullSpeedRateSTB <= TxLineControlReg[`FULL_SPEED_LINE_RATE_BIT];

end

// async read mux

always @(*)

begin

  case (address)

      `TX_CONTROL_REG : dataOut <= {4'b0000, isoEnSTB, preambleEnSTB, SOFSyncSTB, transReqSTB} ;

      `TX_TRANS_TYPE_REG : dataOut <= {6'b000000, TxTransTypeRegSTB};

      `TX_LINE_CONTROL_REG : dataOut <= {3'b000, TxLineControlReg};

      `TX_SOF_ENABLE_REG : dataOut <= {7'b0000000, TxSOFEnableRegSTB};

      `TX_ADDR_REG : dataOut <= {1'b0, TxAddrRegSTB};

      `TX_ENDP_REG : dataOut <= {4'h0, TxEndPRegSTB};

      `FRAME_NUM_MSB_REG : dataOut <= {5'b00000, frameNumInSTB[10:8]};

      `FRAME_NUM_LSB_REG : dataOut <= frameNumInSTB[7:0];

      `INTERRUPT_STATUS_REG :  dataOut <= {4'h0, SOFSentInt, connEventInt, resumeInt, transDoneInt};

      `INTERRUPT_MASK_REG  : dataOut <= {4'h0, interruptMaskReg};

      `RX_STATUS_REG  : dataOut <= RxPktStatusInSTB;

      `RX_PID_REG  : dataOut <= {4'b0000, RxPIDInSTB};

      `RX_CONNECT_STATE_REG : dataOut <= {6'b000000, connectStateInSTB};

      `HOST_SOF_TIMER_MSB_REG : dataOut <= SOFTimerSTB[15:8];

      default: dataOut <= 8'h00;

  endcase

end

//re-sync from busClk to usbClk. 

always @(posedge usbClk) begin

  if (rstSyncToUsbClk == 1'b1) begin

    isoEn <= 1'b0;

    isoEn_reg1 <= 1'b0;

    preambleEn <= 1'b0;

    preambleEn_reg1 <= 1'b0;

    SOFSync <= 1'b0;

    SOFSync_reg1 <= 1'b0;

    TxTransTypeReg <= 2'b00;

    TxTransTypeReg_reg1 <= 2'b00;

    TxSOFEnableReg <= 1'b0;

    TxSOFEnableReg_reg1 <= 1'b0;

    TxAddrReg <= {7{1'b0}};

    TxAddrReg_reg1 <= {7{1'b0}};

    TxEndPReg <= 4'h0;

    TxEndPReg_reg1 <= 4'h0;

    TxLineState <= 2'b00;

    TxLineState_reg1 <= 2'b00;

    LineDirectControlEn <= 1'b0;

    LineDirectControlEn_reg1 <= 1'b0;

    fullSpeedPol <= 1'b0;

    fullSpeedPol_reg1 <= 1'b0;

    fullSpeedRate <= 1'b0;

    fullSpeedRate_reg1 <= 1'b0;

    transReq <= 1'b0;

    transReq_reg1 <= 1'b0;

  end

  else begin

    isoEn_reg1 <= isoEnSTB;

    isoEn <= isoEn_reg1;

    preambleEn_reg1 <= preambleEnSTB;

    preambleEn <= preambleEn_reg1;

    SOFSync_reg1 <= SOFSyncSTB;

    SOFSync <= SOFSync_reg1;

    TxTransTypeReg_reg1 <= TxTransTypeRegSTB;

    TxTransTypeReg <= TxTransTypeReg_reg1;

    TxSOFEnableReg_reg1 <= TxSOFEnableRegSTB;

    TxSOFEnableReg <= TxSOFEnableReg_reg1;

    TxAddrReg_reg1 <= TxAddrRegSTB;

    TxAddrReg <= TxAddrReg_reg1;

    TxEndPReg_reg1 <= TxEndPRegSTB;

    TxEndPReg <= TxEndPReg_reg1;

    TxLineState_reg1 <= TxLineStateSTB;

    TxLineState <= TxLineState_reg1;

    LineDirectControlEn_reg1 <= LineDirectControlEnSTB;

    LineDirectControlEn <= LineDirectControlEn_reg1;

    fullSpeedPol_reg1 <= fullSpeedPolSTB;

    fullSpeedPol <= fullSpeedPol_reg1;

    fullSpeedRate_reg1 <= fullSpeedRateSTB;

    fullSpeedRate <= fullSpeedRate_reg1;

    transReq_reg1 <= transReqSTB;

    transReq <= transReq_reg1;

  end

end

//Extend  resumeIntIn etc from 1 tick to 3 ticks

always @(posedge usbClk) begin

  if (rstSyncToUsbClk == 1'b1) begin

    resumeIntInExtend <= 3'b000;

    transDoneInExtend <= 3'b000;

    connEventInExtend <= 3'b000;

    SOFSentInExtend <= 3'b000;

    clrTransReqExtend <= 3'b000;

  end

  else begin

    if (resumeIntIn == 1'b1)

      resumeIntInExtend <= 3'b111;

    else

      resumeIntInExtend <= {1'b0, resumeIntInExtend[2:1]};

    if (transDoneIn == 1'b1)

      transDoneInExtend <= 3'b111;

    else

      transDoneInExtend <= {1'b0, transDoneInExtend[2:1]};

    if (connEventIn == 1'b1)

      connEventInExtend <= 3'b111;

    else

      connEventInExtend <= {1'b0, connEventInExtend[2:1]};

    if (SOFSentIn == 1'b1)

      SOFSentInExtend <= 3'b111;

    else

      SOFSentInExtend <= {1'b0, SOFSentInExtend[2:1]};

    if (clrTransReq == 1'b1)

      clrTransReqExtend <= 3'b111;

    else

      clrTransReqExtend <= {1'b0, clrTransReqExtend[2:1]};

  end

end

//re-sync from usbClk to busClk. Since 'clrTransReq', 'transDoneIn' etc are only asserted 

//for 3 'usbClk' ticks, busClk freq must be greater than or equal to usbClk/3 freq

always @(posedge busClk) begin

  if (rstSyncToBusClk == 1'b1) begin

    SOFSentInSTB <= 3'b000;

    connEventInSTB <= 3'b000;

    resumeIntInSTB <= 3'b000;

    transDoneInSTB <= 3'b000;

    clrTransReqSTB <= 3'b000;

    frameNumInSTB <= {11{1'b0}};

    frameNumInSTB_reg1 <= {11{1'b0}};

    RxPktStatusInSTB <= 8'h00;

    RxPktStatusInSTB_reg1 <= 8'h00;

    RxPIDInSTB <= 4'h0;

    RxPIDInSTB_reg1 <= 4'h0;

    connectStateInSTB <= 2'b00;

    connectStateInSTB_reg1 <= 2'b00;

    SOFTimerSTB <= 16'h0000;

    SOFTimerSTB_reg1 <= 16'h0000;

  end

  else begin

    frameNumInSTB_reg1 <= frameNumIn;

    frameNumInSTB <= frameNumInSTB_reg1;

    RxPktStatusInSTB_reg1 <= RxPktStatusIn;

    RxPktStatusInSTB <= RxPktStatusInSTB_reg1;

    RxPIDInSTB_reg1 <= RxPIDIn;

    RxPIDInSTB <= RxPIDInSTB_reg1;

    connectStateInSTB_reg1 <= connectStateIn;

    connectStateInSTB <= connectStateInSTB_reg1;

    SOFSentInSTB <= {SOFSentInExtend[0], SOFSentInSTB[2:1]};

    connEventInSTB <= {connEventInExtend[0], connEventInSTB[2:1]};

    resumeIntInSTB <= {resumeIntInExtend[0], resumeIntInSTB[2:1]};

    transDoneInSTB <= {transDoneInExtend[0], transDoneInSTB[2:1]};

    clrTransReqSTB <= {clrTransReqExtend[0], clrTransReqSTB[2:1]};

    //FIXME. It is not safe to pass 'SOFTimer' multi-bit signal between clock domains this way

    //All the other multi-bit signals will be static at the time that they are

    //read, but 'SOFTimer' will not be static.

    SOFTimerSTB_reg1 <= SOFTimer;

    SOFTimerSTB <= SOFTimerSTB_reg1;

  end

end

endmodule