Subversion Repositories openrisc_2011-10-31

// File        : ../RTL/hostController/directcontrol.v

// Generated   : 11/10/06 05:37:19

// From        : ../RTL/hostController/directcontrol.asf

// By          : FSM2VHDL ver. 5.0.0.9

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

////                                                              ////

//// directControl

////                                                              ////

//// 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"

module directControl_simlib (HCTxPortCntl, HCTxPortData, HCTxPortGnt, HCTxPortRdy, HCTxPortReq, HCTxPortWEn, clk, directControlEn, directControlLineState, rst);

input   HCTxPortGnt;

input   HCTxPortRdy;

input   clk;

input   directControlEn;

input   [1:0] directControlLineState;

input   rst;

output  [7:0] HCTxPortCntl;

output  [7:0] HCTxPortData;

output  HCTxPortReq;

output  HCTxPortWEn;

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    clk;

wire    directControlEn;

wire    [1:0] directControlLineState;

wire    rst;

// BINARY ENCODED state machine: drctCntl

// State codes definitions:

`define START_DC 3'b000

`define CHK_DRCT_CNTL 3'b001

`define DRCT_CNTL_WAIT_GNT 3'b010

`define DRCT_CNTL_CHK_LOOP 3'b011

`define DRCT_CNTL_WAIT_RDY 3'b100

`define IDLE_FIN 3'b101

`define IDLE_WAIT_GNT 3'b110

`define IDLE_WAIT_RDY 3'b111

reg [2:0] CurrState_drctCntl;

reg [2:0] NextState_drctCntl;

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

// diagram ACTION

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

// Machine: drctCntl

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

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

// Next State Logic (combinatorial)

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

always @ (directControlLineState or directControlEn or HCTxPortGnt or HCTxPortRdy or HCTxPortReq or HCTxPortWEn or HCTxPortData or HCTxPortCntl or CurrState_drctCntl)

begin : drctCntl_NextState

  NextState_drctCntl <= CurrState_drctCntl;

  // Set default values for outputs and signals

  next_HCTxPortReq <= HCTxPortReq;

  next_HCTxPortWEn <= HCTxPortWEn;

  next_HCTxPortData <= HCTxPortData;

  next_HCTxPortCntl <= HCTxPortCntl;

  case (CurrState_drctCntl)

    `START_DC:

      NextState_drctCntl <= `CHK_DRCT_CNTL;

    `CHK_DRCT_CNTL:

      if (directControlEn == 1'b1)

      begin

        NextState_drctCntl <= `DRCT_CNTL_WAIT_GNT;

        next_HCTxPortReq <= 1'b1;

      end

      else

      begin

        NextState_drctCntl <= `IDLE_WAIT_GNT;

        next_HCTxPortReq <= 1'b1;

      end

    `DRCT_CNTL_WAIT_GNT:

      if (HCTxPortGnt == 1'b1)

        NextState_drctCntl <= `DRCT_CNTL_WAIT_RDY;

    `DRCT_CNTL_CHK_LOOP:

    begin

      next_HCTxPortWEn <= 1'b0;

      if (directControlEn == 1'b0)

      begin

        NextState_drctCntl <= `CHK_DRCT_CNTL;

        next_HCTxPortReq <= 1'b0;

      end

      else

        NextState_drctCntl <= `DRCT_CNTL_WAIT_RDY;

    end

    `DRCT_CNTL_WAIT_RDY:

      if (HCTxPortRdy == 1'b1)

      begin

        NextState_drctCntl <= `DRCT_CNTL_CHK_LOOP;

        next_HCTxPortWEn <= 1'b1;

        next_HCTxPortData <= {6'b000000, directControlLineState};

        next_HCTxPortCntl <= `TX_DIRECT_CONTROL;

      end

    `IDLE_FIN:

    begin

      next_HCTxPortWEn <= 1'b0;

      next_HCTxPortReq <= 1'b0;

      NextState_drctCntl <= `CHK_DRCT_CNTL;

    end

    `IDLE_WAIT_GNT:

      if (HCTxPortGnt == 1'b1)

        NextState_drctCntl <= `IDLE_WAIT_RDY;

    `IDLE_WAIT_RDY:

      if (HCTxPortRdy == 1'b1)

      begin

        NextState_drctCntl <= `IDLE_FIN;

        next_HCTxPortWEn <= 1'b1;

        next_HCTxPortData <= 8'h00;

        next_HCTxPortCntl <= `TX_IDLE;

      end

  endcase

end

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

// Current State Logic (sequential)

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

always @ (posedge clk)

begin : drctCntl_CurrentState

  if (rst)

    CurrState_drctCntl <= `START_DC;

  else

    CurrState_drctCntl <= NextState_drctCntl;

end

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

// Registered outputs logic

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

always @ (posedge clk)

begin : drctCntl_RegOutput

  if (rst)

  begin

    HCTxPortCntl <= 8'h00;

    HCTxPortData <= 8'h00;

    HCTxPortWEn <= 1'b0;

    HCTxPortReq <= 1'b0;

  end

  else

  begin

    HCTxPortCntl <= next_HCTxPortCntl;

    HCTxPortData <= next_HCTxPortData;

    HCTxPortWEn <= next_HCTxPortWEn;

    HCTxPortReq <= next_HCTxPortReq;

  end

end

endmodule