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//////////////////////////////////////////////////////////////////////
////                                                              ////
//// usbSlave.v                                                   ////
////                                                              ////
//// This file is part of the usbhostslave opencores effort.
//// <http://www.opencores.org/cores//>                           ////
////                                                              ////
//// Module Description:                                          ////
////   Top level module
////                                                              ////
//// To Do:                                                       ////
//// 
////                                                              ////
//// Author(s):                                                   ////
//// - Steve Fielding, sfielding@base2designs.com                 ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2008 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 usbslave(
  clk_i,
  rst_i,
  address_i, 
  data_i, 
  data_o, 
  we_i, 
  strobe_i,
  ack_o,
  usbClk,
  slaveVBusDetIntOut,
  slaveNAKSentIntOut,
  slaveSOFRxedIntOut, 
  slaveResetEventIntOut, 
  slaveResumeIntOut, 
  slaveTransDoneIntOut,
  USBWireDataIn,
  USBWireDataInTick,
  USBWireDataOut,
  USBWireDataOutTick,
  USBWireCtrlOut,
  USBFullSpeed,
  USBDPlusPullup,
  USBDMinusPullup,
  vBusDetect
   );
  parameter EP0_FIFO_DEPTH = 64; 
  parameter EP0_FIFO_ADDR_WIDTH = 6;   
  parameter EP1_FIFO_DEPTH = 64; 
  parameter EP1_FIFO_ADDR_WIDTH = 6;   
  parameter EP2_FIFO_DEPTH = 64; 
  parameter EP2_FIFO_ADDR_WIDTH = 6;   
  parameter EP3_FIFO_DEPTH = 64; 
  parameter EP3_FIFO_ADDR_WIDTH = 6;   
 
input clk_i;               //Wishbone bus clock. Maximum 5*usbClk=240MHz
input rst_i;               //Wishbone bus sync reset. Synchronous to 'clk_i'. Resets all logic
input [7:0] address_i;     //Wishbone bus address in
input [7:0] data_i;        //Wishbone bus data in
output [7:0] data_o;       //Wishbone bus data out
input we_i;                //Wishbone bus write enable in
input strobe_i;            //Wishbone bus strobe in
output ack_o;              //Wishbone bus acknowledge out
input usbClk;              //usb clock. 48Mhz +/-0.25%
output slaveSOFRxedIntOut; 
output slaveResetEventIntOut; 
output slaveResumeIntOut; 
output slaveTransDoneIntOut;
output slaveNAKSentIntOut;
output slaveVBusDetIntOut;
input [1:0] USBWireDataIn;
output [1:0] USBWireDataOut;
output USBWireDataOutTick;
output USBWireDataInTick;
output USBWireCtrlOut;
output USBFullSpeed;
output USBDPlusPullup;
output USBDMinusPullup;
input vBusDetect;
 
wire clk_i;
wire rst_i;
wire [7:0] address_i; 
wire [7:0] data_i; 
wire [7:0] data_o; 
wire we_i; 
wire strobe_i;
wire ack_o;
wire usbClk;
wire slaveSOFRxedIntOut; 
wire slaveResetEventIntOut; 
wire slaveResumeIntOut; 
wire slaveTransDoneIntOut;
wire slaveNAKSentIntOut;
wire slaveVBusDetIntOut;
wire [1:0] USBWireDataIn;
wire [1:0] USBWireDataOut;
wire USBWireDataOutTick;
wire USBWireDataInTick;
wire USBWireCtrlOut;
wire USBFullSpeed;
wire USBDPlusPullup;
wire USBDMinusPullup;
wire vBusDetect;
 
//internal wiring
wire slaveControlSel;
wire hostSlaveMuxSel;
wire [7:0] dataFromSlaveControl;
wire [7:0] dataFromHostSlaveMux;
wire [7:0] RxCtrlOut; 
wire [7:0] RxDataFromSIE; 
wire RxDataOutWEn;
wire fullSpeedBitRateFromSlave; 
wire fullSpeedPolarityFromSlave;
wire SIEPortWEnFromSlave; 
wire SIEPortTxRdy;
wire [7:0] SIEPortDataInFromSlave; 
wire [7:0] SIEPortCtrlInFromSlave;
wire [1:0] connectState; 
wire resumeDetected;
wire [7:0] SIEPortDataInToSIE;
wire SIEPortWEnToSIE;
wire [7:0] SIEPortCtrlInToSIE;
wire fullSpeedPolarityToSIE;
wire fullSpeedBitRateToSIE;
wire connectSlaveToHost;
wire noActivityTimeOut;
wire TxFifoEP0REn;
wire TxFifoEP1REn;
wire TxFifoEP2REn;
wire TxFifoEP3REn;
wire [7:0] TxFifoEP0Data;
wire [7:0] TxFifoEP1Data;
wire [7:0] TxFifoEP2Data;
wire [7:0] TxFifoEP3Data;
wire TxFifoEP0Empty;
wire TxFifoEP1Empty;
wire TxFifoEP2Empty;
wire TxFifoEP3Empty;
wire RxFifoEP0WEn;
wire RxFifoEP1WEn;
wire RxFifoEP2WEn;
wire RxFifoEP3WEn;
wire RxFifoEP0Full;
wire RxFifoEP1Full;
wire RxFifoEP2Full;
wire RxFifoEP3Full;
wire [7:0] slaveRxFifoData;
wire [7:0] dataFromEP0RxFifo;
wire [7:0] dataFromEP1RxFifo;
wire [7:0] dataFromEP2RxFifo;
wire [7:0] dataFromEP3RxFifo;
wire [7:0] dataFromEP0TxFifo;
wire [7:0] dataFromEP1TxFifo;
wire [7:0] dataFromEP2TxFifo;
wire [7:0] dataFromEP3TxFifo;
wire slaveEP0RxFifoSel;
wire slaveEP1RxFifoSel;
wire slaveEP2RxFifoSel;
wire slaveEP3RxFifoSel;
wire slaveEP0TxFifoSel;
wire slaveEP1TxFifoSel;
wire slaveEP2TxFifoSel;
wire slaveEP3TxFifoSel;
wire rstSyncToBusClk;
wire rstSyncToUsbClk;
wire noActivityTimeOutEnableToSIE;
wire noActivityTimeOutEnableFromHost;
wire noActivityTimeOutEnableFromSlave;
 
assign USBFullSpeed = fullSpeedBitRateToSIE;  
assign USBDPlusPullup = (USBFullSpeed & connectSlaveToHost);
assign USBDMinusPullup = (~USBFullSpeed & connectSlaveToHost);
 
usbSlaveControl u_usbSlaveControl(
  .busClk(clk_i), 
  .rstSyncToBusClk(rstSyncToBusClk),
  .usbClk(usbClk), 
  .rstSyncToUsbClk(rstSyncToUsbClk),
  .RxByteStatus(RxCtrlOut), 
  .RxData(RxDataFromSIE), 
  .RxDataValid(RxDataOutWEn),
  .SIERxTimeOut(noActivityTimeOut), 
  .SIERxTimeOutEn(noActivityTimeOutEnableFromSlave),
  .RxFifoData(slaveRxFifoData),
  .connectSlaveToHost(connectSlaveToHost),
  .fullSpeedRate(fullSpeedBitRateFromSlave), 
  .fullSpeedPol(fullSpeedPolarityFromSlave),
  .SCTxPortEn(SIEPortWEnFromSlave), 
  .SCTxPortRdy(SIEPortTxRdy),
  .SCTxPortData(SIEPortDataInFromSlave), 
  .SCTxPortCtrl(SIEPortCtrlInFromSlave),
  .vBusDetect(vBusDetect),
  .connectStateIn(connectState), 
  .resumeDetectedIn(resumeDetected),
  .busAddress(address_i[4:0]),
  .busDataIn(data_i), 
  .busDataOut(dataFromSlaveControl), 
  .busWriteEn(we_i),
  .busStrobe_i(strobe_i),
  .SOFRxedIntOut(slaveSOFRxedIntOut), 
  .resetEventIntOut(slaveResetEventIntOut), 
  .resumeIntOut(slaveResumeIntOut), 
  .transDoneIntOut(slaveTransDoneIntOut),
  .NAKSentIntOut(slaveNAKSentIntOut),
  .vBusDetIntOut(slaveVBusDetIntOut),
  .slaveControlSelect(slaveControlSel),
  .TxFifoEP0REn(TxFifoEP0REn),
  .TxFifoEP1REn(TxFifoEP1REn),
  .TxFifoEP2REn(TxFifoEP2REn),
  .TxFifoEP3REn(TxFifoEP3REn),
  .TxFifoEP0Data(TxFifoEP0Data),
  .TxFifoEP1Data(TxFifoEP1Data),
  .TxFifoEP2Data(TxFifoEP2Data),
  .TxFifoEP3Data(TxFifoEP3Data),
  .TxFifoEP0Empty(TxFifoEP0Empty),
  .TxFifoEP1Empty(TxFifoEP1Empty),
  .TxFifoEP2Empty(TxFifoEP2Empty),
  .TxFifoEP3Empty(TxFifoEP3Empty),
  .RxFifoEP0WEn(RxFifoEP0WEn),
  .RxFifoEP1WEn(RxFifoEP1WEn),
  .RxFifoEP2WEn(RxFifoEP2WEn),
  .RxFifoEP3WEn(RxFifoEP3WEn),
  .RxFifoEP0Full(RxFifoEP0Full),
  .RxFifoEP1Full(RxFifoEP1Full),
  .RxFifoEP2Full(RxFifoEP2Full),
  .RxFifoEP3Full(RxFifoEP3Full)
  );
 
 
wishBoneBI u_wishBoneBI (
  .address(address_i), 
  .dataIn(data_i), 
  .dataOut(data_o), 
  .writeEn(we_i), 
  .strobe_i(strobe_i),
  .ack_o(ack_o),
  .clk(clk_i), 
  .rst(rstSyncToBusClk),
  .hostControlSel(), 
  .hostRxFifoSel(), 
  .hostTxFifoSel(),
  .slaveControlSel(slaveControlSel),
  .slaveEP0RxFifoSel(slaveEP0RxFifoSel), 
  .slaveEP1RxFifoSel(slaveEP1RxFifoSel), 
  .slaveEP2RxFifoSel(slaveEP2RxFifoSel), 
  .slaveEP3RxFifoSel(slaveEP3RxFifoSel), 
  .slaveEP0TxFifoSel(slaveEP0TxFifoSel), 
  .slaveEP1TxFifoSel(slaveEP1TxFifoSel), 
  .slaveEP2TxFifoSel(slaveEP2TxFifoSel), 
  .slaveEP3TxFifoSel(slaveEP3TxFifoSel), 
  .hostSlaveMuxSel(hostSlaveMuxSel),
  .dataFromHostControl(8'h00),
  .dataFromHostRxFifo(8'h00),
  .dataFromHostTxFifo(8'h00),
  .dataFromSlaveControl(dataFromSlaveControl),
  .dataFromEP0RxFifo(dataFromEP0RxFifo), 
  .dataFromEP1RxFifo(dataFromEP1RxFifo), 
  .dataFromEP2RxFifo(dataFromEP2RxFifo), 
  .dataFromEP3RxFifo(dataFromEP3RxFifo),
  .dataFromEP0TxFifo(dataFromEP0TxFifo), 
  .dataFromEP1TxFifo(dataFromEP1TxFifo), 
  .dataFromEP2TxFifo(dataFromEP2TxFifo), 
  .dataFromEP3TxFifo(dataFromEP3TxFifo),
  .dataFromHostSlaveMux(dataFromHostSlaveMux)
   );
 
 
 
assign SIEPortCtrlInToSIE = SIEPortCtrlInFromSlave;
assign SIEPortDataInToSIE = SIEPortDataInFromSlave;
assign SIEPortWEnToSIE = SIEPortWEnFromSlave;
assign fullSpeedPolarityToSIE = fullSpeedPolarityFromSlave;
assign fullSpeedBitRateToSIE = fullSpeedBitRateFromSlave;
assign noActivityTimeOutEnableToSIE = noActivityTimeOutEnableFromSlave;
 
hostSlaveMuxBI u_hostSlaveMuxBI (
  .dataIn(data_i), 
  .dataOut(dataFromHostSlaveMux),
  .address(address_i[0]),
  .writeEn(we_i),
  .strobe_i(strobe_i),
  .usbClk(usbClk), 
  .busClk(clk_i), 
  .hostSlaveMuxSel(hostSlaveMuxSel),
  .hostMode(), 
  .rstFromWire(rst_i),
  .rstSyncToBusClkOut(rstSyncToBusClk),
  .rstSyncToUsbClkOut(rstSyncToUsbClk)
);
 
usbSerialInterfaceEngine u_usbSerialInterfaceEngine(
  .clk(usbClk), 
  .rst(rstSyncToUsbClk),
  .USBWireDataIn(USBWireDataIn),
  .USBWireDataOut(USBWireDataOut),
  .USBWireDataInTick(USBWireDataInTick),
  .USBWireDataOutTick(USBWireDataOutTick),
  .USBWireCtrlOut(USBWireCtrlOut),
  .connectState(connectState),
  .resumeDetected(resumeDetected),
  .RxCtrlOut(RxCtrlOut), 
  .RxDataOutWEn(RxDataOutWEn), 
  .RxDataOut(RxDataFromSIE), 
  .SIEPortCtrlIn(SIEPortCtrlInToSIE),
  .SIEPortDataIn(SIEPortDataInToSIE), 
  .SIEPortTxRdy(SIEPortTxRdy), 
  .SIEPortWEn(SIEPortWEnToSIE), 
  .fullSpeedPolarity(fullSpeedPolarityToSIE),
  .fullSpeedBitRate(fullSpeedBitRateToSIE),
  .noActivityTimeOut(noActivityTimeOut),
  .noActivityTimeOutEnable(noActivityTimeOutEnableToSIE)
);
 
 
 
//---Slave fifos
 
TxFifo #(EP0_FIFO_DEPTH, EP0_FIFO_ADDR_WIDTH) EP0TxFifo (
  .usbClk(usbClk), 
  .busClk(clk_i), 
  .rstSyncToBusClk(rstSyncToBusClk), 
  .rstSyncToUsbClk(rstSyncToUsbClk), 
  .fifoREn(TxFifoEP0REn), 
  .fifoEmpty(TxFifoEP0Empty),
  .busAddress(address_i[2:0]), 
  .busWriteEn(we_i), 
  .busStrobe_i(strobe_i),
  .busFifoSelect(slaveEP0TxFifoSel),
  .busDataIn(data_i),
  .busDataOut(dataFromEP0TxFifo),
  .fifoDataOut(TxFifoEP0Data) );
 
TxFifo #(EP1_FIFO_DEPTH, EP1_FIFO_ADDR_WIDTH) EP1TxFifo (
  .usbClk(usbClk), 
  .busClk(clk_i), 
  .rstSyncToBusClk(rstSyncToBusClk), 
  .rstSyncToUsbClk(rstSyncToUsbClk), 
  .fifoREn(TxFifoEP1REn), 
  .fifoEmpty(TxFifoEP1Empty),
  .busAddress(address_i[2:0]), 
  .busWriteEn(we_i), 
  .busStrobe_i(strobe_i),
  .busFifoSelect(slaveEP1TxFifoSel),
  .busDataIn(data_i), 
  .busDataOut(dataFromEP1TxFifo),
  .fifoDataOut(TxFifoEP1Data) );
 
TxFifo #(EP2_FIFO_DEPTH, EP2_FIFO_ADDR_WIDTH) EP2TxFifo (
  .usbClk(usbClk), 
  .busClk(clk_i), 
  .rstSyncToBusClk(rstSyncToBusClk), 
  .rstSyncToUsbClk(rstSyncToUsbClk), 
  .fifoREn(TxFifoEP2REn), 
  .fifoEmpty(TxFifoEP2Empty),
  .busAddress(address_i[2:0]), 
  .busWriteEn(we_i), 
  .busStrobe_i(strobe_i),
  .busFifoSelect(slaveEP2TxFifoSel),
  .busDataIn(data_i), 
  .busDataOut(dataFromEP2TxFifo),
  .fifoDataOut(TxFifoEP2Data) );
 
TxFifo #(EP3_FIFO_DEPTH, EP3_FIFO_ADDR_WIDTH) EP3TxFifo (
  .usbClk(usbClk), 
  .busClk(clk_i), 
  .rstSyncToBusClk(rstSyncToBusClk), 
  .rstSyncToUsbClk(rstSyncToUsbClk), 
  .fifoREn(TxFifoEP3REn), 
  .fifoEmpty(TxFifoEP3Empty),
  .busAddress(address_i[2:0]), 
  .busWriteEn(we_i), 
  .busStrobe_i(strobe_i),
  .busFifoSelect(slaveEP3TxFifoSel),
  .busDataIn(data_i), 
  .busDataOut(dataFromEP3TxFifo),
  .fifoDataOut(TxFifoEP3Data) );
 
RxFifo #(EP0_FIFO_DEPTH, EP0_FIFO_ADDR_WIDTH) EP0RxFifo(
  .usbClk(usbClk), 
  .busClk(clk_i), 
  .rstSyncToBusClk(rstSyncToBusClk), 
  .rstSyncToUsbClk(rstSyncToUsbClk), 
  .fifoWEn(RxFifoEP0WEn), 
  .fifoFull(RxFifoEP0Full),
  .busAddress(address_i[2:0]), 
  .busWriteEn(we_i), 
  .busStrobe_i(strobe_i),
  .busFifoSelect(slaveEP0RxFifoSel),
  .busDataIn(data_i), 
  .busDataOut(dataFromEP0RxFifo),
  .fifoDataIn(slaveRxFifoData)  );
 
RxFifo #(EP1_FIFO_DEPTH, EP1_FIFO_ADDR_WIDTH) EP1RxFifo(
  .usbClk(usbClk), 
  .busClk(clk_i), 
  .rstSyncToBusClk(rstSyncToBusClk), 
  .rstSyncToUsbClk(rstSyncToUsbClk), 
  .fifoWEn(RxFifoEP1WEn), 
  .fifoFull(RxFifoEP1Full),
  .busAddress(address_i[2:0]), 
  .busWriteEn(we_i), 
  .busStrobe_i(strobe_i),
  .busFifoSelect(slaveEP1RxFifoSel),
  .busDataIn(data_i), 
  .busDataOut(dataFromEP1RxFifo),
  .fifoDataIn(slaveRxFifoData)  );
 
RxFifo #(EP2_FIFO_DEPTH, EP2_FIFO_ADDR_WIDTH) EP2RxFifo(
  .usbClk(usbClk), 
  .busClk(clk_i), 
  .rstSyncToBusClk(rstSyncToBusClk), 
  .rstSyncToUsbClk(rstSyncToUsbClk), 
  .fifoWEn(RxFifoEP2WEn), 
  .fifoFull(RxFifoEP2Full),
  .busAddress(address_i[2:0]), 
  .busWriteEn(we_i), 
  .busStrobe_i(strobe_i),
  .busFifoSelect(slaveEP2RxFifoSel),
  .busDataIn(data_i), 
  .busDataOut(dataFromEP2RxFifo),
  .fifoDataIn(slaveRxFifoData)  );
 
RxFifo #(EP3_FIFO_DEPTH, EP3_FIFO_ADDR_WIDTH) EP3RxFifo(
  .usbClk(usbClk), 
  .busClk(clk_i), 
  .rstSyncToBusClk(rstSyncToBusClk), 
  .rstSyncToUsbClk(rstSyncToUsbClk), 
  .fifoWEn(RxFifoEP3WEn), 
  .fifoFull(RxFifoEP3Full),
  .busAddress(address_i[2:0]), 
  .busWriteEn(we_i), 
  .busStrobe_i(strobe_i),
  .busFifoSelect(slaveEP3RxFifoSel),
  .busDataIn(data_i), 
  .busDataOut(dataFromEP3RxFifo),
  .fifoDataIn(slaveRxFifoData)  );
 
 
 
endmodule