// File        : ../RTL/hostController/sendpacket.v
// Generated   : 10/15/06 20:31:19
// From        : ../RTL/hostController/sendpacket.asf
// By          : FSM2VHDL ver. 5.0.0.9

//////////////////////////////////////////////////////////////////////
////                                                              ////
//// sendPacket
////                                                              ////
//// 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"
`include "usbSerialInterfaceEngine_h.v"
`include "usbConstants_h.v"



module sendPacket (HCTxPortCntl, HCTxPortData, HCTxPortGnt, HCTxPortRdy, HCTxPortReq, HCTxPortWEn, PID, TxAddr, TxEndP, clk, fifoData, fifoEmpty, fifoReadEn, frameNum, fullSpeedPolarity, rst, sendPacketRdy, sendPacketWEn);
input   HCTxPortGnt;
input   HCTxPortRdy;
input   [3:0] PID;
input   [6:0] TxAddr;
input   [3:0] TxEndP;
input   clk;
input   [7:0] fifoData;
input   fifoEmpty;
input   fullSpeedPolarity;
input   rst;
input   sendPacketWEn;
output  [7:0] HCTxPortCntl;
output  [7:0] HCTxPortData;
output  HCTxPortReq;
output  HCTxPortWEn;
output  fifoReadEn;
output  [10:0] frameNum;
output  sendPacketRdy;

reg     [7:0] HCTxPortCntl, next_HCTxPortCntl;
reg     [7:0] HCTxPortData, next_HCTxPortData;
wire    HCTxPortGnt;
wire    HCTxPortRdy;
reg     HCTxPortReq, next_HCTxPortReq;
reg     HCTxPortWEn, next_HCTxPortWEn;
wire    [3:0] PID;
wire    [6:0] TxAddr;
wire    [3:0] TxEndP;
wire    clk;
wire    [7:0] fifoData;
wire    fifoEmpty;
reg     fifoReadEn, next_fifoReadEn;
reg     [10:0] frameNum, next_frameNum;
wire    fullSpeedPolarity;
wire    rst;
reg     sendPacketRdy, next_sendPacketRdy;
wire    sendPacketWEn;

// diagram signals declarations
reg  [7:0]PIDNotPID;

// BINARY ENCODED state machine: sndPkt
// State codes definitions:
`define START_SP 5'b00000
`define WAIT_ENABLE 5'b00001
`define SP_WAIT_GNT 5'b00010
`define SEND_PID_WAIT_RDY 5'b00011
`define SEND_PID_FIN 5'b00100
`define FIN_SP 5'b00101
`define OUT_IN_SETUP_WAIT_RDY1 5'b00110
`define OUT_IN_SETUP_WAIT_RDY2 5'b00111
`define OUT_IN_SETUP_FIN 5'b01000
`define SEND_SOF_FIN1 5'b01001
`define SEND_SOF_WAIT_RDY3 5'b01010
`define SEND_SOF_WAIT_RDY4 5'b01011
`define DATA0_DATA1_READ_FIFO 5'b01100
`define DATA0_DATA1_WAIT_READ_FIFO 5'b01101
`define DATA0_DATA1_FIFO_EMPTY 5'b01110
`define DATA0_DATA1_FIN 5'b01111
`define DATA0_DATA1_TERM_BYTE 5'b10000
`define OUT_IN_SETUP_CLR_WEN1 5'b10001
`define SEND_SOF_CLR_WEN1 5'b10010
`define DATA0_DATA1_CLR_WEN 5'b10011
`define DATA0_DATA1_CLR_REN 5'b10100
`define LS_EOP_WAIT_RDY 5'b10101
`define LS_EOP_FIN 5'b10110

reg [4:0] CurrState_sndPkt;
reg [4:0] NextState_sndPkt;

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

always @(PID)
begin
    PIDNotPID <=  { (PID ^ 4'hf), PID };
end

//--------------------------------------------------------------------
// Machine: sndPkt
//--------------------------------------------------------------------
//----------------------------------
// Next State Logic (combinatorial)
//----------------------------------
always @ (PIDNotPID or TxEndP or TxAddr or frameNum or fifoData or sendPacketWEn or HCTxPortGnt or PID or fullSpeedPolarity or HCTxPortRdy or fifoEmpty or sendPacketRdy or HCTxPortReq or HCTxPortWEn or HCTxPortData or HCTxPortCntl or fifoReadEn or CurrState_sndPkt)
begin : sndPkt_NextState
  NextState_sndPkt <= CurrState_sndPkt;
  // Set default values for outputs and signals
  next_sendPacketRdy <= sendPacketRdy;
  next_HCTxPortReq <= HCTxPortReq;
  next_HCTxPortWEn <= HCTxPortWEn;
  next_HCTxPortData <= HCTxPortData;
  next_HCTxPortCntl <= HCTxPortCntl;
  next_frameNum <= frameNum;
  next_fifoReadEn <= fifoReadEn;
  case (CurrState_sndPkt)
    `START_SP:
      NextState_sndPkt <= `WAIT_ENABLE;
    `WAIT_ENABLE:
      if (sendPacketWEn == 1'b1)	
      begin
        NextState_sndPkt <= `SP_WAIT_GNT;
        next_sendPacketRdy <= 1'b0;
        next_HCTxPortReq <= 1'b1;
      end
    `SP_WAIT_GNT:
      if ((HCTxPortGnt == 1'b1) && (PID == `SOF && fullSpeedPolarity == 1'b0))	
        NextState_sndPkt <= `LS_EOP_WAIT_RDY;
      else if (HCTxPortGnt == 1'b1)	
        NextState_sndPkt <= `SEND_PID_WAIT_RDY;
    `FIN_SP:
    begin
      NextState_sndPkt <= `WAIT_ENABLE;
      next_sendPacketRdy <= 1'b1;
      next_HCTxPortReq <= 1'b0;
    end
    `SEND_PID_WAIT_RDY:
      if (HCTxPortRdy == 1'b1)	
      begin
        NextState_sndPkt <= `SEND_PID_FIN;
        next_HCTxPortWEn <= 1'b1;
        next_HCTxPortData <= PIDNotPID;
        next_HCTxPortCntl <= `TX_PACKET_START;
      end
    `SEND_PID_FIN:
    begin
      next_HCTxPortWEn <= 1'b0;
      if (PID == `DATA0 || PID == `DATA1)	
        NextState_sndPkt <= `DATA0_DATA1_FIFO_EMPTY;
      else if (PID == `SOF)	
        NextState_sndPkt <= `SEND_SOF_WAIT_RDY3;
      else if (PID == `OUT || 
        PID == `IN || 
        PID == `SETUP)	
        NextState_sndPkt <= `OUT_IN_SETUP_WAIT_RDY1;
      else
        NextState_sndPkt <= `FIN_SP;
    end
    `OUT_IN_SETUP_WAIT_RDY1:
      if (HCTxPortRdy == 1'b1)	
      begin
        NextState_sndPkt <= `OUT_IN_SETUP_CLR_WEN1;
        next_HCTxPortWEn <= 1'b1;
        next_HCTxPortData <= {TxEndP[0], TxAddr[6:0]};
        next_HCTxPortCntl <= `TX_PACKET_STREAM;
      end
    `OUT_IN_SETUP_WAIT_RDY2:
      if (HCTxPortRdy == 1'b1)	
      begin
        NextState_sndPkt <= `OUT_IN_SETUP_FIN;
        next_HCTxPortWEn <= 1'b1;
        next_HCTxPortData <= {5'b00000, TxEndP[3:1]};
        next_HCTxPortCntl <= `TX_PACKET_STREAM;
      end
    `OUT_IN_SETUP_FIN:
    begin
      next_HCTxPortWEn <= 1'b0;
      NextState_sndPkt <= `FIN_SP;
    end
    `OUT_IN_SETUP_CLR_WEN1:
    begin
      next_HCTxPortWEn <= 1'b0;
      NextState_sndPkt <= `OUT_IN_SETUP_WAIT_RDY2;
    end
    `SEND_SOF_FIN1:
    begin
      next_HCTxPortWEn <= 1'b0;
      next_frameNum <= frameNum + 1'b1;
      NextState_sndPkt <= `FIN_SP;
    end
    `SEND_SOF_WAIT_RDY3:
      if (HCTxPortRdy == 1'b1)	
      begin
        NextState_sndPkt <= `SEND_SOF_CLR_WEN1;
        next_HCTxPortWEn <= 1'b1;
        next_HCTxPortData <= frameNum[7:0];
        next_HCTxPortCntl <= `TX_PACKET_STREAM;
      end
    `SEND_SOF_WAIT_RDY4:
      if (HCTxPortRdy == 1'b1)	
      begin
        NextState_sndPkt <= `SEND_SOF_FIN1;
        next_HCTxPortWEn <= 1'b1;
        next_HCTxPortData <= {5'b00000, frameNum[10:8]};
        next_HCTxPortCntl <= `TX_PACKET_STREAM;
      end
    `SEND_SOF_CLR_WEN1:
    begin
      next_HCTxPortWEn <= 1'b0;
      NextState_sndPkt <= `SEND_SOF_WAIT_RDY4;
    end
    `DATA0_DATA1_READ_FIFO:
    begin
      next_HCTxPortWEn <= 1'b1;
      next_HCTxPortData <= fifoData;
      next_HCTxPortCntl <= `TX_PACKET_STREAM;
      NextState_sndPkt <= `DATA0_DATA1_CLR_WEN;
    end
    `DATA0_DATA1_WAIT_READ_FIFO:
      if (HCTxPortRdy == 1'b1)	
      begin
        NextState_sndPkt <= `DATA0_DATA1_CLR_REN;
        next_fifoReadEn <= 1'b1;
      end
    `DATA0_DATA1_FIFO_EMPTY:
      if (fifoEmpty == 1'b0)	
        NextState_sndPkt <= `DATA0_DATA1_WAIT_READ_FIFO;
      else
        NextState_sndPkt <= `DATA0_DATA1_TERM_BYTE;
    `DATA0_DATA1_FIN:
    begin
      next_HCTxPortWEn <= 1'b0;
      NextState_sndPkt <= `FIN_SP;
    end
    `DATA0_DATA1_TERM_BYTE:
      if (HCTxPortRdy == 1'b1)	
      begin
        NextState_sndPkt <= `DATA0_DATA1_FIN;
        //Last byte is not valid data,
        //but the 'TX_PACKET_STOP' flag is required
        //by the SIE state machine to detect end of data packet
        next_HCTxPortWEn <= 1'b1;
        next_HCTxPortData <= 8'h00;
        next_HCTxPortCntl <= `TX_PACKET_STOP;
      end
    `DATA0_DATA1_CLR_WEN:
    begin
      next_HCTxPortWEn <= 1'b0;
      NextState_sndPkt <= `DATA0_DATA1_FIFO_EMPTY;
    end
    `DATA0_DATA1_CLR_REN:
    begin
      next_fifoReadEn <= 1'b0;
      NextState_sndPkt <= `DATA0_DATA1_READ_FIFO;
    end
    `LS_EOP_WAIT_RDY:
      if (HCTxPortRdy == 1'b1)	
      begin
        NextState_sndPkt <= `LS_EOP_FIN;
        next_HCTxPortWEn <= 1'b1;
        next_HCTxPortData <= 8'h00;
        next_HCTxPortCntl <= `TX_LS_KEEP_ALIVE;
      end
    `LS_EOP_FIN:
    begin
      next_HCTxPortWEn <= 1'b0;
      NextState_sndPkt <= `FIN_SP;
    end
  endcase
end

//----------------------------------
// Current State Logic (sequential)
//----------------------------------
always @ (posedge clk)
begin : sndPkt_CurrentState
  if (rst)	
    CurrState_sndPkt <= `START_SP;
  else
    CurrState_sndPkt <= NextState_sndPkt;
end

//----------------------------------
// Registered outputs logic
//----------------------------------
always @ (posedge clk)
begin : sndPkt_RegOutput
  if (rst)	
  begin
    sendPacketRdy <= 1'b1;
    HCTxPortReq <= 1'b0;
    HCTxPortWEn <= 1'b0;
    HCTxPortData <= 8'h00;
    HCTxPortCntl <= 8'h00;
    frameNum <= 11'h000;
    fifoReadEn <= 1'b0;
  end
  else 
  begin
    sendPacketRdy <= next_sendPacketRdy;
    HCTxPortReq <= next_HCTxPortReq;
    HCTxPortWEn <= next_HCTxPortWEn;
    HCTxPortData <= next_HCTxPortData;
    HCTxPortCntl <= next_HCTxPortCntl;
    frameNum <= next_frameNum;
    fifoReadEn <= next_fifoReadEn;
  end
end

endmodule