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

////                                                              ////

//// USBSlaveControlBI.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>                   ////

////                                                              ////

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

//

`timescale 1ns / 1ps

`include "usbSlaveControl_h.v"

module USBSlaveControlBI (address, dataIn, dataOut, writeEn,

  strobe_i,

  busClk,

  rstSyncToBusClk,

  usbClk,

  rstSyncToUsbClk,

  SOFRxedIntOut, resetEventIntOut, resumeIntOut, transDoneIntOut, NAKSentIntOut,

  endP0TransTypeReg, endP0NAKTransTypeReg,

  endP1TransTypeReg, endP1NAKTransTypeReg,

  endP2TransTypeReg, endP2NAKTransTypeReg,

  endP3TransTypeReg, endP3NAKTransTypeReg,

  endP0ControlReg,

  endP1ControlReg,

  endP2ControlReg,

  endP3ControlReg,

  EP0StatusReg,

  EP1StatusReg,

  EP2StatusReg,

  EP3StatusReg,

  SCAddrReg, frameNum,

  connectStateIn,

  SOFRxedIn, resetEventIn, resumeIntIn, transDoneIn, NAKSentIn,

  slaveControlSelect,

  clrEP0Ready, clrEP1Ready, clrEP2Ready, clrEP3Ready,

  TxLineState,

  LineDirectControlEn,

  fullSpeedPol,

  fullSpeedRate,

  SCGlobalEn

  );

input [4:0] address;

input [7:0] dataIn;

input writeEn;

input strobe_i;

input busClk;

input rstSyncToBusClk;

input usbClk;

input rstSyncToUsbClk;

output [7:0] dataOut;

output SOFRxedIntOut;

output resetEventIntOut;

output resumeIntOut;

output transDoneIntOut;

output NAKSentIntOut;

input [1:0] endP0TransTypeReg;

input [1:0] endP0NAKTransTypeReg;

input [1:0] endP1TransTypeReg;

input [1:0] endP1NAKTransTypeReg;

input [1:0] endP2TransTypeReg;

input [1:0] endP2NAKTransTypeReg;

input [1:0] endP3TransTypeReg;

input [1:0] endP3NAKTransTypeReg;

output [4:0] endP0ControlReg;

output [4:0] endP1ControlReg;

output [4:0] endP2ControlReg;

output [4:0] endP3ControlReg;

input [7:0] EP0StatusReg;

input [7:0] EP1StatusReg;

input [7:0] EP2StatusReg;

input [7:0] EP3StatusReg;

output [6:0] SCAddrReg;

input [10:0] frameNum;

input [1:0] connectStateIn;

input SOFRxedIn;

input resetEventIn;

input resumeIntIn;

input transDoneIn;

input NAKSentIn;

input slaveControlSelect;

input clrEP0Ready;

input clrEP1Ready;

input clrEP2Ready;

input clrEP3Ready;

output [1:0] TxLineState;

output LineDirectControlEn;

output fullSpeedPol;

output fullSpeedRate;

output SCGlobalEn;

wire [4:0] address;

wire [7:0] dataIn;

wire writeEn;

wire strobe_i;

wire busClk;

wire rstSyncToBusClk;

wire usbClk;

wire rstSyncToUsbClk;

reg [7:0] dataOut;

reg SOFRxedIntOut;

reg resetEventIntOut;

reg resumeIntOut;

reg transDoneIntOut;

reg NAKSentIntOut;

wire [1:0] endP0TransTypeReg;

wire [1:0] endP0NAKTransTypeReg;

wire [1:0] endP1TransTypeReg;

wire [1:0] endP1NAKTransTypeReg;

wire [1:0] endP2TransTypeReg;

wire [1:0] endP2NAKTransTypeReg;

wire [1:0] endP3TransTypeReg;

wire [1:0] endP3NAKTransTypeReg;

reg [4:0] endP0ControlReg;

reg [4:0] endP1ControlReg;

reg [4:0] endP2ControlReg;

reg [4:0] endP3ControlReg;

wire [7:0] EP0StatusReg;

wire [7:0] EP1StatusReg;

wire [7:0] EP2StatusReg;

wire [7:0] EP3StatusReg;

reg [6:0] SCAddrReg;

reg [3:0] TxEndPReg;

wire [10:0] frameNum;

wire [1:0] connectStateIn;

wire SOFRxedIn;

wire resetEventIn;

wire resumeIntIn;

wire transDoneIn;

wire NAKSentIn;

wire slaveControlSelect;

wire clrEP0Ready;

wire clrEP1Ready;

wire clrEP2Ready;

wire clrEP3Ready;

reg [1:0] TxLineState;

reg LineDirectControlEn;

reg fullSpeedPol;

reg fullSpeedRate;

reg SCGlobalEn;

//internal wire and regs

reg [5:0] SCControlReg;

reg clrNAKReq;

reg clrSOFReq;

reg clrResetReq;

reg clrResInReq;

reg clrTransDoneReq;

reg SOFRxedInt;

reg resetEventInt;

reg resumeInt;

reg transDoneInt;

reg NAKSentInt;

reg [4:0] interruptMaskReg;

reg EP0SetReady;

reg EP1SetReady;

reg EP2SetReady;

reg EP3SetReady;

reg EP0SendStall;

reg EP1SendStall;

reg EP2SendStall;

reg EP3SendStall;

reg EP0IsoEn;

reg EP1IsoEn;

reg EP2IsoEn;

reg EP3IsoEn;

reg EP0DataSequence;

reg EP1DataSequence;

reg EP2DataSequence;

reg EP3DataSequence;

reg EP0Enable;

reg EP1Enable;

reg EP2Enable;

reg EP3Enable;

reg EP0Ready;

reg EP1Ready;

reg EP2Ready;

reg EP3Ready;

//clock domain crossing sync registers

//STB = Sync To Busclk

reg [4:0] endP0ControlRegSTB;

reg [4:0] endP1ControlRegSTB;

reg [4:0] endP2ControlRegSTB;

reg [4:0] endP3ControlRegSTB;

reg NAKSentInSTB;

reg SOFRxedInSTB;

reg resetEventInSTB;

reg resumeIntInSTB;

reg transDoneInSTB;

reg clrEP0ReadySTB;

reg clrEP1ReadySTB;

reg clrEP2ReadySTB;

reg clrEP3ReadySTB;

reg SCGlobalEnSTB;

reg [1:0] TxLineStateSTB;

reg LineDirectControlEnSTB;

reg fullSpeedPolSTB;

reg fullSpeedRateSTB;

reg [7:0] EP0StatusRegSTB;

reg [7:0] EP1StatusRegSTB;

reg [7:0] EP2StatusRegSTB;

reg [7:0] EP3StatusRegSTB;

reg [1:0] endP0TransTypeRegSTB;

reg [1:0] endP0NAKTransTypeRegSTB;

reg [1:0] endP1TransTypeRegSTB;

reg [1:0] endP1NAKTransTypeRegSTB;

reg [1:0] endP2TransTypeRegSTB;

reg [1:0] endP2NAKTransTypeRegSTB;

reg [1:0] endP3TransTypeRegSTB;

reg [1:0] endP3NAKTransTypeRegSTB;

reg [10:0] frameNumSTB;

//sync write demux

always @(posedge busClk)

begin

  if (rstSyncToBusClk == 1'b1) begin

    EP0IsoEn <= 1'b0;

    EP0SendStall <= 1'b0;

    EP0DataSequence <= 1'b0;

    EP0Enable <= 1'b0;

    EP1IsoEn <= 1'b0;

    EP1SendStall <= 1'b0;

    EP1DataSequence <= 1'b0;

    EP1Enable <= 1'b0;

    EP2IsoEn <= 1'b0;

    EP2SendStall <= 1'b0;

    EP2DataSequence <= 1'b0;

    EP2Enable <= 1'b0;

    EP3IsoEn <= 1'b0;

    EP3SendStall <= 1'b0;

    EP3DataSequence <= 1'b0;

    EP3Enable <= 1'b0;

    SCControlReg <= 6'h00;

    SCAddrReg <= 7'h00;

    interruptMaskReg <= 5'h00;

  end

  else begin

    clrNAKReq <= 1'b0;

    clrSOFReq <= 1'b0;

    clrResetReq <= 1'b0;

    clrResInReq <= 1'b0;

    clrTransDoneReq <= 1'b0;

    EP0SetReady <= 1'b0;

    EP1SetReady <= 1'b0;

    EP2SetReady <= 1'b0;

    EP3SetReady <= 1'b0;

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

    begin

      case (address)

        `EP0_CTRL_REG : begin

          EP0IsoEn <= dataIn[`ENDPOINT_ISO_ENABLE_BIT];

          EP0SendStall <= dataIn[`ENDPOINT_SEND_STALL_BIT];

          EP0DataSequence <= dataIn[`ENDPOINT_OUTDATA_SEQUENCE_BIT];

          EP0SetReady <= dataIn[`ENDPOINT_READY_BIT];

          EP0Enable <= dataIn[`ENDPOINT_ENABLE_BIT];

        end

        `EP1_CTRL_REG : begin

          EP1IsoEn <= dataIn[`ENDPOINT_ISO_ENABLE_BIT];

          EP1SendStall <= dataIn[`ENDPOINT_SEND_STALL_BIT];

          EP1DataSequence <= dataIn[`ENDPOINT_OUTDATA_SEQUENCE_BIT];

          EP1SetReady <= dataIn[`ENDPOINT_READY_BIT];

          EP1Enable <= dataIn[`ENDPOINT_ENABLE_BIT];

        end

        `EP2_CTRL_REG : begin

          EP2IsoEn <= dataIn[`ENDPOINT_ISO_ENABLE_BIT];

          EP2SendStall <= dataIn[`ENDPOINT_SEND_STALL_BIT];

          EP2DataSequence <= dataIn[`ENDPOINT_OUTDATA_SEQUENCE_BIT];

          EP2SetReady <= dataIn[`ENDPOINT_READY_BIT];

          EP2Enable <= dataIn[`ENDPOINT_ENABLE_BIT];

        end

        `EP3_CTRL_REG : begin

          EP3IsoEn <= dataIn[`ENDPOINT_ISO_ENABLE_BIT];

          EP3SendStall <= dataIn[`ENDPOINT_SEND_STALL_BIT];

          EP3DataSequence <= dataIn[`ENDPOINT_OUTDATA_SEQUENCE_BIT];

          EP3SetReady <= dataIn[`ENDPOINT_READY_BIT];

          EP3Enable <= dataIn[`ENDPOINT_ENABLE_BIT];

        end

        `SC_CONTROL_REG : SCControlReg <= dataIn[5:0];

        `SC_ADDRESS : SCAddrReg <= dataIn[6:0];

        `SC_INTERRUPT_STATUS_REG : begin

          clrNAKReq <= dataIn[`NAK_SENT_INT_BIT];

          clrSOFReq <= dataIn[`SOF_RECEIVED_BIT];

          clrResetReq <= dataIn[`RESET_EVENT_BIT];

          clrResInReq <= dataIn[`RESUME_INT_BIT];

          clrTransDoneReq <= dataIn[`TRANS_DONE_BIT];

        end

        `SC_INTERRUPT_MASK_REG  : interruptMaskReg <= dataIn[4:0];

      endcase

    end

  end

end

//interrupt control 

always @(posedge busClk)

begin

  if (rstSyncToBusClk == 1'b1) begin

    NAKSentInt <= 1'b0;

    SOFRxedInt <= 1'b0;

    resetEventInt <= 1'b0;

    resumeInt <= 1'b0;

    transDoneInt <= 1'b0;

  end

  else begin

    if (NAKSentInSTB == 1'b1)

      NAKSentInt <= 1'b1;

    else if (clrNAKReq == 1'b1)

      NAKSentInt <= 1'b0;

    if (SOFRxedInSTB == 1'b1)

      SOFRxedInt <= 1'b1;

    else if (clrSOFReq == 1'b1)

      SOFRxedInt <= 1'b0;

    if (resetEventInSTB == 1'b1)

      resetEventInt <= 1'b1;

    else if (clrResetReq == 1'b1)

      resetEventInt <= 1'b0;

    if (resumeIntInSTB == 1'b1)

      resumeInt <= 1'b1;

    else if (clrResInReq == 1'b1)

      resumeInt <= 1'b0;

    if (transDoneInSTB == 1'b1)

      transDoneInt <= 1'b1;

    else if (clrTransDoneReq == 1'b1)

      transDoneInt <= 1'b0;

  end

end

//mask interrupts

always @(interruptMaskReg or transDoneInt or resumeInt or resetEventInt or SOFRxedInt or NAKSentInt) begin

  transDoneIntOut <= transDoneInt & interruptMaskReg[`TRANS_DONE_BIT];

  resumeIntOut <= resumeInt & interruptMaskReg[`RESUME_INT_BIT];

  resetEventIntOut <= resetEventInt & interruptMaskReg[`RESET_EVENT_BIT];

  SOFRxedIntOut <= SOFRxedInt & interruptMaskReg[`SOF_RECEIVED_BIT];

  NAKSentIntOut <= NAKSentInt & interruptMaskReg[`NAK_SENT_INT_BIT];

end

//end point ready, set/clear

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

//'EP0SetReady' etc must be delayed with respect to other control signals, thus

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

//domain before the ready is asserted.

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

//detection of 'EP0Ready' and sampling of related control signals.always @(posedge busClk)

always @(posedge busClk)

begin

  if (rstSyncToBusClk == 1'b1) begin

    EP0Ready <= 1'b0;

    EP1Ready <= 1'b0;

    EP2Ready <= 1'b0;

    EP3Ready <= 1'b0;

  end

  else begin

    if (EP0SetReady == 1'b1)

      EP0Ready <= 1'b1;

    else if (clrEP0ReadySTB == 1'b1)

      EP0Ready <= 1'b0;

    if (EP1SetReady == 1'b1)

      EP1Ready <= 1'b1;

    else if (clrEP1ReadySTB == 1'b1)

      EP1Ready <= 1'b0;

    if (EP2SetReady == 1'b1)

      EP2Ready <= 1'b1;

    else if (clrEP2ReadySTB == 1'b1)

      EP2Ready <= 1'b0;

    if (EP3SetReady == 1'b1)

      EP3Ready <= 1'b1;

    else if (clrEP3ReadySTB == 1'b1)

      EP3Ready <= 1'b0;

  end

end

//break out control signals

always @(SCControlReg) begin

  SCGlobalEnSTB <= SCControlReg[`SC_GLOBAL_ENABLE_BIT];

  TxLineStateSTB <= SCControlReg[`SC_TX_LINE_STATE_MSBIT:`SC_TX_LINE_STATE_LSBIT];

  LineDirectControlEnSTB <= SCControlReg[`SC_DIRECT_CONTROL_BIT];

  fullSpeedPolSTB <= SCControlReg[`SC_FULL_SPEED_LINE_POLARITY_BIT];

  fullSpeedRateSTB <= SCControlReg[`SC_FULL_SPEED_LINE_RATE_BIT];

end

//combine endpoint control signals 

always @(EP0IsoEn or EP0SendStall or EP0Ready or EP0DataSequence or EP0Enable or

  EP1IsoEn or EP1SendStall or EP1Ready or EP1DataSequence or EP1Enable or

  EP2IsoEn or EP2SendStall or EP2Ready or EP2DataSequence or EP2Enable or

  EP3IsoEn or EP3SendStall or EP3Ready or EP3DataSequence or EP3Enable)

begin

  endP0ControlRegSTB <= {EP0IsoEn, EP0SendStall, EP0DataSequence, EP0Ready, EP0Enable};

  endP1ControlRegSTB <= {EP1IsoEn, EP1SendStall, EP1DataSequence, EP1Ready, EP1Enable};

  endP2ControlRegSTB <= {EP2IsoEn, EP2SendStall, EP2DataSequence, EP2Ready, EP2Enable};

  endP3ControlRegSTB <= {EP3IsoEn, EP3SendStall, EP3DataSequence, EP3Ready, EP3Enable};

end

// async read mux

// FIX ME

// Not sure why 'EP0SendStall' etc are in sensitivity list. May be related to

// some translation bug

always @(address or

  EP0SendStall or EP0Ready or EP0DataSequence or EP0Enable or

  EP1SendStall or EP1Ready or EP1DataSequence or EP1Enable or

  EP2SendStall or EP2Ready or EP2DataSequence or EP2Enable or

  EP3SendStall or EP3Ready or EP3DataSequence or EP3Enable or

  EP0StatusRegSTB or EP1StatusRegSTB or EP2StatusRegSTB or EP3StatusRegSTB or

  endP0ControlRegSTB or endP1ControlRegSTB or endP2ControlRegSTB or endP3ControlRegSTB or

  endP0NAKTransTypeRegSTB or endP1NAKTransTypeRegSTB or endP2NAKTransTypeRegSTB or endP3NAKTransTypeRegSTB or

  endP0TransTypeRegSTB or endP1TransTypeRegSTB or endP2TransTypeRegSTB or endP3TransTypeRegSTB or

  SCControlReg or connectStateIn or

  NAKSentInt or SOFRxedInt or resetEventInt or resumeInt or transDoneInt or

  interruptMaskReg or SCAddrReg or frameNumSTB)

begin

  case (address)

      `EP0_CTRL_REG : dataOut <= endP0ControlRegSTB;

      `EP0_STS_REG : dataOut <= EP0StatusRegSTB;

      `EP0_TRAN_TYPE_STS_REG : dataOut <= endP0TransTypeRegSTB;

      `EP0_NAK_TRAN_TYPE_STS_REG : dataOut <= endP0NAKTransTypeRegSTB;

      `EP1_CTRL_REG : dataOut <= endP1ControlRegSTB;

      `EP1_STS_REG :  dataOut <= EP1StatusRegSTB;

      `EP1_TRAN_TYPE_STS_REG : dataOut <= endP1TransTypeRegSTB;

      `EP1_NAK_TRAN_TYPE_STS_REG : dataOut <= endP1NAKTransTypeRegSTB;

      `EP2_CTRL_REG : dataOut <= endP2ControlRegSTB;

      `EP2_STS_REG :  dataOut <= EP2StatusRegSTB;

      `EP2_TRAN_TYPE_STS_REG : dataOut <= endP2TransTypeRegSTB;

      `EP2_NAK_TRAN_TYPE_STS_REG : dataOut <= endP2NAKTransTypeRegSTB;

      `EP3_CTRL_REG : dataOut <= endP3ControlRegSTB;

      `EP3_STS_REG :  dataOut <= EP3StatusRegSTB;

      `EP3_TRAN_TYPE_STS_REG : dataOut <= endP3TransTypeRegSTB;

      `EP3_NAK_TRAN_TYPE_STS_REG : dataOut <= endP3NAKTransTypeRegSTB;

      `SC_CONTROL_REG : dataOut <= SCControlReg;

      `SC_LINE_STATUS_REG : dataOut <= {6'b000000, connectStateIn};

      `SC_INTERRUPT_STATUS_REG :  dataOut <= {3'b000, NAKSentInt, SOFRxedInt, resetEventInt, resumeInt, transDoneInt};

      `SC_INTERRUPT_MASK_REG  : dataOut <= {3'b000, interruptMaskReg};

      `SC_ADDRESS : dataOut <= {1'b0, SCAddrReg};

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

      `SC_FRAME_NUM_LSP : dataOut <= frameNumSTB[7:0];

      default: dataOut <= 8'h00;

  endcase

end

//re-sync from busClk to usbClk. 

always @(posedge usbClk) begin

  endP0ControlReg <= endP0ControlRegSTB;

  endP1ControlReg <= endP1ControlRegSTB;

  endP2ControlReg <= endP2ControlRegSTB;

  endP3ControlReg <= endP3ControlRegSTB;

  SCGlobalEn <= SCGlobalEnSTB;

  TxLineState <= TxLineStateSTB;

  LineDirectControlEn <= LineDirectControlEnSTB;

  fullSpeedPol <= fullSpeedPolSTB;

  fullSpeedRate <= fullSpeedRateSTB;

end

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

//for one 'usbClk' tick, busClk freq must be greater than or equal to usbClk freq

always @(posedge busClk) begin

  NAKSentInSTB <= NAKSentIn;

  SOFRxedInSTB <= SOFRxedIn;

  resetEventInSTB <= resetEventIn;

  resumeIntInSTB <= resumeIntIn;

  transDoneInSTB <= transDoneIn;

  clrEP0ReadySTB <= clrEP0Ready;

  clrEP1ReadySTB <= clrEP1Ready;

  clrEP2ReadySTB <= clrEP2Ready;

  clrEP3ReadySTB <= clrEP3Ready;

  EP0StatusRegSTB <= EP0StatusReg;

  EP1StatusRegSTB <= EP1StatusReg;

  EP2StatusRegSTB <= EP2StatusReg;

  EP3StatusRegSTB <= EP3StatusReg;

  endP0TransTypeRegSTB <= endP0TransTypeReg;

  endP1TransTypeRegSTB <= endP1TransTypeReg;

  endP2TransTypeRegSTB <= endP2TransTypeReg;

  endP3TransTypeRegSTB <= endP3TransTypeReg;

  endP0NAKTransTypeRegSTB <= endP0NAKTransTypeReg;

  endP1NAKTransTypeRegSTB <= endP1NAKTransTypeReg;

  endP2NAKTransTypeRegSTB <= endP2NAKTransTypeReg;

  endP3NAKTransTypeRegSTB <= endP3NAKTransTypeReg;

  frameNumSTB <= frameNum;

end

endmodule