//////////////////////////////////////////////////////////////////////////                                                              //////// MODULE NAME: Frame Length Checker                            ////////                                                              //////// DESCRIPTION: Frame Length Checker of  10 Gigabit             ////////     Ethernet MAC. Many statistics are implemented            ////////     here.                                                    ////////                                                              //////// This file is part of the 10 Gigabit Ethernet IP core project ////////  http://www.opencores.org/projects/ethmac10g/                ////////                                                              //////// AUTHOR(S):                                                   //////// Zheng Cao                                                    ////////                                                              //////////////////////////////////////////////////////////////////////////////                                                              //////// Copyright (c) 2005 AUTHORS.  All rights reserved.            ////////                                                              //////// 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                     ////////                                                              ////////////////////////////////////////////////////////////////////////////// CVS REVISION HISTORY://// $Log: not supported by cvs2svn $// Revision 1.1.1.1  2006/05/31 05:59:42  Zheng Cao// first version//// Revision 1.1  2005/12/25 16:43:10  Zheng Cao// // ////////////////////////////////////////////////////////////////////////`include "timescale.v"`include "xgiga_define.v"module rxLenTypChecker(rxclk, reset, get_terminator, terminator_location, jumbo_enable, tagged_frame,        frame_cnt, vlan_enable,length_error,large_error, small_error, padded_frame, length_65_127,        length_128_255, length_256_511, length_512_1023, length_1024_max,jumbo_frame);         input  rxclk;    input  reset;    input  jumbo_enable; //Enable jumbo frame recieving    input  vlan_enable;  //VLAN mode enable bit    input  tagged_frame;	 //number of 64bits DATA field of tagged frame contains    input  get_terminator;    input[`COUNTER_WIDTH-1:0] frame_cnt;     input[2:0] terminator_location;    output length_error;    output large_error;    output small_error;    output padded_frame;    output length_65_127;    output length_128_255;    output length_256_511;    output length_512_1023;    output length_1024_max;    output jumbo_frame;     parameter TP =1 ;    reg [2:0]location_reg;    always@(posedge rxclk or posedge reset)begin         if (reset)            location_reg <=#TP 0;         else if(get_terminator)           location_reg <=#TP terminator_location;         else            location_reg <=#TP location_reg;         end    reg large_error;    always@(posedge rxclk or posedge reset)begin         if(reset)            large_error <=#TP 1'b0;         else if(tagged_frame & vlan_enable) begin             if ((frame_cnt == `MAX_TAG_LENGTH) & (location_reg > `MAX_TAG_BITS_MORE))                large_error <=#TP 1'b1;             else if ((frame_cnt > `MAX_TAG_LENGTH) & ~jumbo_enable)                large_error <=#TP 1'b1;             else if(frame_cnt > `MAX_JUMBO_LENGTH)                large_error <=#TP 1'b1;             else                large_error <=#TP 1'b0;         end         else begin             if ((frame_cnt == `MAX_VALID_LENGTH) & (location_reg > `MAX_VALID_BITS_MORE))               large_error <=#TP 1'b1;             else if((frame_cnt > `MAX_VALID_LENGTH) & ~jumbo_enable)                large_error <=#TP 1'b1;             else if(frame_cnt > `MAX_JUMBO_LENGTH)               large_error <=#TP 1'b1;             else               large_error <=#TP 1'b0;         end    end    reg small_error;    always@(posedge rxclk or posedge reset) begin         if(reset)           small_error <=#TP 0;    else            small_error <=#TP get_terminator & (frame_cnt< `MIN_VALID_LENGTH);    end    wire length_error;    assign length_error = small_error | large_error;         /////////////////////////////////////////////////    // Statistic signals    /////////////////////////////////////////////////         ///////////////////////////////////    // 64byte frame received OK    ///////////////////////////////////    reg padded_frame;    always@(posedge rxclk or posedge reset) begin          if(reset)            padded_frame <=#TP 0;          else            padded_frame <=#TP get_terminator & (frame_cnt==`MIN_VALID_LENGTH);    end    ///////////////////////////////////    // 65-127 byte Frame Received OK    ///////////////////////////////////    reg length_65_127;    always@(posedge rxclk or posedge reset) begin          if(reset)            length_65_127 <=#TP 0;          else            length_65_127 <=#TP get_terminator & (frame_cnt>`MIN_VALID_LENGTH) & (frame_cnt <=127);    end    ///////////////////////////////////    // 128-255 byte Frame Received OK    ///////////////////////////////////    reg length_128_255;    always@(posedge rxclk or posedge reset) begin         if(reset)           length_128_255 <=#TP 0;         else           length_128_255 <=#TP get_terminator & (frame_cnt>128) & (frame_cnt <=255);    end    ///////////////////////////////////    // 256-511 byte Frame Received OK    ///////////////////////////////////    reg length_256_511;    always@(posedge rxclk or posedge reset) begin         if(reset)           length_256_511 <=#TP 0;         else           length_256_511 <=#TP get_terminator & (frame_cnt>256) & (frame_cnt <=511);    end    ///////////////////////////////////    // 512-1023 byte Frame Received OK    ///////////////////////////////////    reg length_512_1023;    always@(posedge rxclk or posedge reset) begin         if(reset)           length_512_1023 <=#TP 0;         else           length_512_1023 <=#TP get_terminator & (frame_cnt>512) & (frame_cnt <=1023);    end    ///////////////////////////////////    // 1024-max byte Frame Received OK    ///////////////////////////////////    reg length_1024_max;    always@(posedge rxclk or posedge reset) begin         if(reset)           length_1024_max <=#TP 0;         else           length_1024_max <=#TP get_terminator & (frame_cnt>1024) & (frame_cnt <=`MAX_VALID_LENGTH);    end    //////////////////////////////////////////////    // Count for Control Frames Received OK    //////////////////////////////////////////////    //how to indicate a control frame(not clearly specificated in 802.3    ///////////////////////////////////////////////    // Count for Oversize Frames Received OK    ///////////////////////////////////////////////     reg jumbo_frame;    always@(posedge rxclk or posedge reset) begin         if(reset)           jumbo_frame <=#TP 0;         else           jumbo_frame <=#TP get_terminator & jumbo_enable & (frame_cnt > `MAX_VALID_LENGTH) & (frame_cnt < `MAX_JUMBO_LENGTH);    endendmodule