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

////                                                              ////

////  RMON_addr_gen.v                                             ////

////                                                              ////

////  This file is part of the Ethernet IP core project           ////

////  http://www.opencores.org/projects.cgi/web/ethernet_tri_mode/////

////                                                              ////

////  Author(s):                                                  ////

////      - Jon Gao (gaojon@yahoo.com)                            ////

////                                                              ////

////                                                              ////

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

////                                                              ////

//// Copyright (C) 2001 Authors                                   ////

////                                                              ////

//// 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. ////

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//// 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.                                               ////

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//// 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                     ////

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

//                                                                    

// CVS Revision History                                               

//                                                                    

// $Log: not supported by cvs2svn $

// Revision 1.3  2006/01/19 14:07:55  maverickist

// verification is complete.

//

// Revision 1.2  2005/12/16 06:44:19  Administrator

// replaced tab with space.

// passed 9.6k length frame test.

//

// Revision 1.1.1.1  2005/12/13 01:51:45  Administrator

// no message

//         

module RMON_addr_gen(

Clk                 ,

Reset               ,

//RMON                                             

Pkt_type_rmon       ,

Pkt_length_rmon     ,

Apply_rmon          ,//pluse signal looks like eop 

Pkt_err_type_rmon   ,

//                                                 

Reg_apply           ,

Reg_addr            ,

Reg_data            ,

Reg_next            ,

//CPU                                              

Reg_drop_apply

);

input           Clk                 ;

input           Reset               ;

                //RMON

input   [2:0]   Pkt_type_rmon       ;

input   [15:0]  Pkt_length_rmon     ;

input           Apply_rmon          ;//pluse signal looks like eop

input   [2:0]   Pkt_err_type_rmon   ;

                //RMON_ctrl

output          Reg_apply           ;

output  [4:0]   Reg_addr            ;

output  [15:0]  Reg_data            ;

input           Reg_next            ;

                //CPU

output          Reg_drop_apply      ;

//******************************************************************************

//internal signals                                                              

//******************************************************************************

parameter       StateIdle       =4'd0;

parameter       StatePktLength  =4'd1;

parameter       StatePktNumber  =4'd2;

parameter       StatePktType    =4'd3;

parameter       StatePktRange   =4'd4;

reg [3:0]       CurrentState /* synthesys syn_keep=1 */;

reg [3:0]       NextState;

reg [2:0]       PktTypeReg      ;

reg [15:0]      PktLengthReg    ;

reg [2:0]       PktErrTypeReg   ;

reg             Reg_apply       ;

reg [4:0]       Reg_addr            ;

reg [15:0]      Reg_data            ;

reg             Reg_drop_apply  ;

//******************************************************************************

//register boundery signals    

//******************************************************************************

reg             Apply_rmon_dl1;

reg             Apply_rmon_dl2;

reg             Apply_rmon_pulse;

reg [2:0]       Pkt_type_rmon_dl1       ;

reg [15:0]      Pkt_length_rmon_dl1     ;

reg [2:0]       Pkt_err_type_rmon_dl1   ;

always @(posedge Clk or posedge Reset)

    if (Reset)

        begin

        Pkt_type_rmon_dl1       <=0;

        Pkt_length_rmon_dl1     <=0;

        Pkt_err_type_rmon_dl1   <=0;

        end

    else

        begin

        Pkt_type_rmon_dl1       <=Pkt_type_rmon     ;

        Pkt_length_rmon_dl1     <=Pkt_length_rmon   ;

        Pkt_err_type_rmon_dl1   <=Pkt_err_type_rmon ;

        end

always @(posedge Clk or posedge Reset)

    if (Reset)

        begin

        Apply_rmon_dl1  <=0;

        Apply_rmon_dl2  <=0;

        end

    else

        begin

        Apply_rmon_dl1  <=Apply_rmon;

        Apply_rmon_dl2  <=Apply_rmon_dl1;

        end

always @(Apply_rmon_dl1 or Apply_rmon_dl2)

    if (Apply_rmon_dl1&!Apply_rmon_dl2)

        Apply_rmon_pulse    =1;

    else

        Apply_rmon_pulse    =0;

always @(posedge Clk or posedge Reset)

    if (Reset)

        begin

        PktTypeReg          <=0;

        PktLengthReg        <=0;

        PktErrTypeReg       <=0;

        end

    else if (Apply_rmon_pulse&&CurrentState==StateIdle)

        begin

        PktTypeReg          <=Pkt_type_rmon_dl1     ;

        PktLengthReg        <=Pkt_length_rmon_dl1   ;

        PktErrTypeReg       <=Pkt_err_type_rmon_dl1 ;

        end

//******************************************************************************

//State Machine                                                             

//******************************************************************************

always @(posedge Clk or posedge Reset)

    if (Reset)

        CurrentState    <=StateIdle;

    else

        CurrentState    <=NextState;

always @(CurrentState or Apply_rmon_pulse or Reg_next)

    case (CurrentState)

        StateIdle:

            if (Apply_rmon_pulse)

                NextState   =StatePktLength;

            else

                NextState   =StateIdle;

        StatePktLength:

            if (Reg_next)

                NextState   =StatePktNumber;

            else

                NextState   =CurrentState;

        StatePktNumber:

            if (Reg_next)

                NextState   =StatePktType;

            else

                NextState   =CurrentState;

        StatePktType:

            if (Reg_next)

                NextState   =StatePktRange;

            else

                NextState   =CurrentState;

        StatePktRange:

            if (Reg_next)

                NextState   =StateIdle;

            else

                NextState   =CurrentState;

        default:

                NextState   =StateIdle;

    endcase

//******************************************************************************

//gen output signals                                                            

//******************************************************************************

//Reg_apply

always @ (CurrentState)

    if (CurrentState==StatePktLength||CurrentState==StatePktNumber||

        CurrentState==StatePktType||CurrentState==StatePktRange)

        Reg_apply   =1;

    else

        Reg_apply   =0;

//Reg_addr

always @ (posedge Clk or posedge Reset)

    if (Reset)

        Reg_addr    <=0;

    else case (CurrentState)

            StatePktLength:

                Reg_addr    <=5'd00;

            StatePktNumber:

                Reg_addr    <=5'd01;

            StatePktType:

                case(PktTypeReg)

                    3'b011:

                        Reg_addr    <=5'd02;    //broadcast

                    3'b001:

                        Reg_addr    <=5'd03;    //multicast 

                    3'b100:

                        Reg_addr    <=5'd16;    //pause frame   

                    default:

                        Reg_addr    <=5'd04;    //unicast

                endcase

            StatePktRange:

                case(PktErrTypeReg)

                    3'b001:

                        Reg_addr    <=5'd05;

                    3'b010:

                        Reg_addr    <=5'd06;

                    3'b011:

                        Reg_addr    <=5'd07;

                    3'b100:

                        if (PktLengthReg<64)

                            Reg_addr    <=5'd08;

                        else if (PktLengthReg==64)

                            Reg_addr    <=5'd09;

                        else if (PktLengthReg<128)

                            Reg_addr    <=5'd10;

                        else if (PktLengthReg<256)

                            Reg_addr    <=5'd11;

                        else if (PktLengthReg<512)

                            Reg_addr    <=5'd12;

                        else if (PktLengthReg<1024)

                            Reg_addr    <=5'd13;

                        else if (PktLengthReg<1519)

                            Reg_addr    <=5'd14;

                        else

                            Reg_addr    <=5'd15;

                    default:

                        Reg_addr    <=5'd05;

                endcase

            default:

                    Reg_addr    <=5'd05;

        endcase

//Reg_data

always @ (CurrentState or PktLengthReg)

    case (CurrentState)

        StatePktLength:

            Reg_data    =PktLengthReg;

        StatePktNumber:

            Reg_data    =1;

        StatePktType:

            Reg_data =1;

        StatePktRange:

            Reg_data =1;

        default:

            Reg_data =0;

    endcase

//Reg_drop_apply

always @ (posedge Clk or posedge Reset)

    if (Reset)

        Reg_drop_apply  <=0;

    else if (CurrentState!=StateIdle&&Apply_rmon_pulse)

        Reg_drop_apply  <=1;

    else

        Reg_drop_apply  <=0;

endmodule