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// File        : ../RTL/slaveController/slaveSendpacket.v

// Generated   : 11/10/06 05:37:26

// From        : ../RTL/slaveController/slaveSendpacket.asf

// By          : FSM2VHDL ver. 5.0.0.9

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

////                                                              ////

//// slaveSendPacket

////                                                              ////

//// 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 "usbhostslave_serialinterfaceengine_h.v"

`include "usbhostslave_constants_h.v"

module slaveSendPacket (PID, SCTxPortCntl, SCTxPortData, SCTxPortGnt, SCTxPortRdy, SCTxPortReq, SCTxPortWEn, clk, fifoData, fifoEmpty, fifoReadEn, rst, sendPacketRdy, sendPacketWEn);

input   [3:0] PID;

input   SCTxPortGnt;

input   SCTxPortRdy;

input   clk;

input   [7:0] fifoData;

input   fifoEmpty;

input   rst;

input   sendPacketWEn;

output  [7:0] SCTxPortCntl;

output  [7:0] SCTxPortData;

output  SCTxPortReq;

output  SCTxPortWEn;

output  fifoReadEn;

output  sendPacketRdy;

wire    [3:0] PID;

reg     [7:0] SCTxPortCntl, next_SCTxPortCntl;

reg     [7:0] SCTxPortData, next_SCTxPortData;

wire    SCTxPortGnt;

wire    SCTxPortRdy;

reg     SCTxPortReq, next_SCTxPortReq;

reg     SCTxPortWEn, next_SCTxPortWEn;

wire    clk;

wire    [7:0] fifoData;

wire    fifoEmpty;

reg     fifoReadEn, next_fifoReadEn;

wire    rst;

reg     sendPacketRdy, next_sendPacketRdy;

wire    sendPacketWEn;

// diagram signals declarations

reg  [7:0]PIDNotPID;

// BINARY ENCODED state machine: slvSndPkt

// State codes definitions:

`define START_SP1 4'b0000

`define SP_WAIT_ENABLE 4'b0001

`define SP1_WAIT_GNT 4'b0010

`define SP_SEND_PID_WAIT_RDY 4'b0011

`define SP_SEND_PID_FIN 4'b0100

`define FIN_SP1 4'b0101

`define SP_D0_D1_READ_FIFO 4'b0110

`define SP_D0_D1_WAIT_READ_FIFO 4'b0111

`define SP_D0_D1_FIFO_EMPTY 4'b1000

`define SP_D0_D1_FIN 4'b1001

`define SP_D0_D1_TERM_BYTE 4'b1010

`define SP_NOT_DATA 4'b1011

`define SP_D0_D1_CLR_WEN 4'b1100

`define SP_D0_D1_CLR_REN 4'b1101

reg [3:0] CurrState_slvSndPkt;

reg [3:0] NextState_slvSndPkt;

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

always @(PID)

begin

    PIDNotPID <=  { (PID ^ 4'hf), PID };

end

//--------------------------------------------------------------------

// Machine: slvSndPkt

//--------------------------------------------------------------------

//----------------------------------

// Next State Logic (combinatorial)

//----------------------------------

always @ (PIDNotPID or fifoData or sendPacketWEn or SCTxPortGnt or SCTxPortRdy or PID or fifoEmpty or sendPacketRdy or SCTxPortReq or SCTxPortWEn or SCTxPortData or SCTxPortCntl or fifoReadEn or CurrState_slvSndPkt)

begin : slvSndPkt_NextState

  NextState_slvSndPkt <= CurrState_slvSndPkt;

  // Set default values for outputs and signals

  next_sendPacketRdy <= sendPacketRdy;

  next_SCTxPortReq <= SCTxPortReq;

  next_SCTxPortWEn <= SCTxPortWEn;

  next_SCTxPortData <= SCTxPortData;

  next_SCTxPortCntl <= SCTxPortCntl;

  next_fifoReadEn <= fifoReadEn;

  case (CurrState_slvSndPkt)

    `START_SP1:

      NextState_slvSndPkt <= `SP_WAIT_ENABLE;

    `SP_WAIT_ENABLE:

      if (sendPacketWEn == 1'b1)

      begin

        NextState_slvSndPkt <= `SP1_WAIT_GNT;

        next_sendPacketRdy <= 1'b0;

        next_SCTxPortReq <= 1'b1;

      end

    `SP1_WAIT_GNT:

      if (SCTxPortGnt == 1'b1)

        NextState_slvSndPkt <= `SP_SEND_PID_WAIT_RDY;

    `FIN_SP1:

    begin

      NextState_slvSndPkt <= `SP_WAIT_ENABLE;

      next_sendPacketRdy <= 1'b1;

      next_SCTxPortReq <= 1'b0;

    end

    `SP_NOT_DATA:

      NextState_slvSndPkt <= `FIN_SP1;

    `SP_SEND_PID_WAIT_RDY:

      if (SCTxPortRdy == 1'b1)

      begin

        NextState_slvSndPkt <= `SP_SEND_PID_FIN;

        next_SCTxPortWEn <= 1'b1;

        next_SCTxPortData <= PIDNotPID;

        next_SCTxPortCntl <= `TX_PACKET_START;

      end

    `SP_SEND_PID_FIN:

    begin

      next_SCTxPortWEn <= 1'b0;

      if (PID == `DATA0 || PID == `DATA1)

        NextState_slvSndPkt <= `SP_D0_D1_FIFO_EMPTY;

      else

        NextState_slvSndPkt <= `SP_NOT_DATA;

    end

    `SP_D0_D1_READ_FIFO:

    begin

      next_SCTxPortWEn <= 1'b1;

      next_SCTxPortData <= fifoData;

      next_SCTxPortCntl <= `TX_PACKET_STREAM;

      NextState_slvSndPkt <= `SP_D0_D1_CLR_WEN;

    end

    `SP_D0_D1_WAIT_READ_FIFO:

      if (SCTxPortRdy == 1'b1)

      begin

        NextState_slvSndPkt <= `SP_D0_D1_CLR_REN;

        next_fifoReadEn <= 1'b1;

      end

    `SP_D0_D1_FIFO_EMPTY:

      if (fifoEmpty == 1'b0)

        NextState_slvSndPkt <= `SP_D0_D1_WAIT_READ_FIFO;

      else

        NextState_slvSndPkt <= `SP_D0_D1_TERM_BYTE;

    `SP_D0_D1_FIN:

    begin

      next_SCTxPortWEn <= 1'b0;

      NextState_slvSndPkt <= `FIN_SP1;

    end

    `SP_D0_D1_TERM_BYTE:

      if (SCTxPortRdy == 1'b1)

      begin

        NextState_slvSndPkt <= `SP_D0_D1_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_SCTxPortWEn <= 1'b1;

        next_SCTxPortData <= 8'h00;

        next_SCTxPortCntl <= `TX_PACKET_STOP;

      end

    `SP_D0_D1_CLR_WEN:

    begin

      next_SCTxPortWEn <= 1'b0;

      NextState_slvSndPkt <= `SP_D0_D1_FIFO_EMPTY;

    end

    `SP_D0_D1_CLR_REN:

    begin

      next_fifoReadEn <= 1'b0;

      NextState_slvSndPkt <= `SP_D0_D1_READ_FIFO;

    end

  endcase

end

//----------------------------------

// Current State Logic (sequential)

//----------------------------------

always @ (posedge clk)

begin : slvSndPkt_CurrentState

  if (rst)

    CurrState_slvSndPkt <= `START_SP1;

  else

    CurrState_slvSndPkt <= NextState_slvSndPkt;

end

//----------------------------------

// Registered outputs logic

//----------------------------------

always @ (posedge clk)

begin : slvSndPkt_RegOutput

  if (rst)

  begin

    sendPacketRdy <= 1'b1;

    SCTxPortReq <= 1'b0;

    SCTxPortWEn <= 1'b0;

    SCTxPortData <= 8'h00;

    SCTxPortCntl <= 8'h00;

    fifoReadEn <= 1'b0;

  end

  else

  begin

    sendPacketRdy <= next_sendPacketRdy;

    SCTxPortReq <= next_SCTxPortReq;

    SCTxPortWEn <= next_SCTxPortWEn;

    SCTxPortData <= next_SCTxPortData;

    SCTxPortCntl <= next_SCTxPortCntl;

    fifoReadEn <= next_fifoReadEn;

  end

end

endmodule