//////////////////////////////////////////////////////////////////////
////                                                              ////
//// 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>                   ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
`include "timescale.v"
`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;