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fisher5090 |
//////////////////////////////////////////////////////////////////////
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//// ////
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//// MODULE NAME: Frame Length Checker ////
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//// ////
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//// DESCRIPTION: Frame Length Checker of 10 Gigabit ////
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//// Ethernet MAC. Many statistics are implemented ////
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//// here. ////
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//// ////
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//// This file is part of the 10 Gigabit Ethernet IP core project ////
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//// http://www.opencores.org/projects/ethmac10g/ ////
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//// ////
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//// AUTHOR(S): ////
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//// Zheng Cao ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (c) 2005 AUTHORS. All rights reserved. ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//
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// CVS REVISION HISTORY:
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//
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// $Log: not supported by cvs2svn $
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// Revision 1.1 2005/12/25 16:43:10 Zheng Cao
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//
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//
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//
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//////////////////////////////////////////////////////////////////////
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`include "timescale.v"
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`include "xgiga_define.v"
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module rxLenTypChecker(rxclk, reset, get_terminator, terminator_location, jumbo_enable, tagged_frame,
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frame_cnt, vlan_enable,length_error,large_error, small_error, padded_frame, length_65_127,
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length_128_255, length_256_511, length_512_1023, length_1024_max,jumbo_frame);
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input rxclk;
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input reset;
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input jumbo_enable; //Enable jumbo frame recieving
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input vlan_enable; //VLAN mode enable bit
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input tagged_frame; //number of 64bits DATA field of tagged frame contains
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input get_terminator;
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input[`COUNTER_WIDTH-1:0] frame_cnt;
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input[2:0] terminator_location;
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output length_error;
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output large_error;
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output small_error;
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output padded_frame;
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output length_65_127;
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output length_128_255;
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output length_256_511;
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output length_512_1023;
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output length_1024_max;
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output jumbo_frame;
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parameter TP =1 ;
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reg [2:0]location_reg;
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always@(posedge rxclk or posedge reset)begin
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if (reset)
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location_reg <=#TP 0;
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else if(get_terminator)
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location_reg <=#TP terminator_location;
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else
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location_reg <=#TP location_reg;
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end
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reg large_error;
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always@(posedge rxclk or posedge reset)begin
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if(reset)
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large_error <=#TP 1'b0;
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else if(tagged_frame & vlan_enable) begin
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if ((frame_cnt == `MAX_TAG_LENGTH) & (location_reg > `MAX_TAG_BITS_MORE))
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large_error <=#TP 1'b1;
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else if ((frame_cnt > `MAX_TAG_LENGTH) & ~jumbo_enable)
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large_error <=#TP 1'b1;
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else if(frame_cnt > `MAX_JUMBO_LENGTH)
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large_error <=#TP 1'b1;
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else
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large_error <=#TP 1'b0;
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end
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else begin
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if ((frame_cnt == `MAX_VALID_LENGTH) & (location_reg > `MAX_VALID_BITS_MORE))
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large_error <=#TP 1'b1;
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else if((frame_cnt > `MAX_VALID_LENGTH) & ~jumbo_enable)
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large_error <=#TP 1'b1;
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else if(frame_cnt > `MAX_JUMBO_LENGTH)
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large_error <=#TP 1'b1;
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else
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large_error <=#TP 1'b0;
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end
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end
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reg small_error;
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always@(posedge rxclk or posedge reset) begin
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if(reset)
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small_error <=#TP 0;
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else
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small_error <=#TP get_terminator & (frame_cnt< `MIN_VALID_LENGTH);
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end
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wire length_error;
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assign length_error = small_error | large_error;
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/////////////////////////////////////////////////
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// Statistic signals
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/////////////////////////////////////////////////
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///////////////////////////////////
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// 64byte frame received OK
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///////////////////////////////////
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reg padded_frame;
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always@(posedge rxclk or posedge reset) begin
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if(reset)
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padded_frame <=#TP 0;
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else
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padded_frame <=#TP get_terminator & (frame_cnt==`MIN_VALID_LENGTH);
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end
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///////////////////////////////////
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// 65-127 byte Frame Received OK
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///////////////////////////////////
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reg length_65_127;
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always@(posedge rxclk or posedge reset) begin
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if(reset)
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length_65_127 <=#TP 0;
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else
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length_65_127 <=#TP get_terminator & (frame_cnt>`MIN_VALID_LENGTH) & (frame_cnt <=127);
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end
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///////////////////////////////////
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// 128-255 byte Frame Received OK
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///////////////////////////////////
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reg length_128_255;
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always@(posedge rxclk or posedge reset) begin
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if(reset)
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length_128_255 <=#TP 0;
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else
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length_128_255 <=#TP get_terminator & (frame_cnt>128) & (frame_cnt <=255);
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end
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///////////////////////////////////
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// 256-511 byte Frame Received OK
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///////////////////////////////////
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reg length_256_511;
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always@(posedge rxclk or posedge reset) begin
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if(reset)
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length_256_511 <=#TP 0;
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else
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length_256_511 <=#TP get_terminator & (frame_cnt>256) & (frame_cnt <=511);
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end
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///////////////////////////////////
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// 512-1023 byte Frame Received OK
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///////////////////////////////////
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reg length_512_1023;
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always@(posedge rxclk or posedge reset) begin
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if(reset)
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length_512_1023 <=#TP 0;
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else
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length_512_1023 <=#TP get_terminator & (frame_cnt>512) & (frame_cnt <=1023);
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end
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///////////////////////////////////
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// 1024-max byte Frame Received OK
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///////////////////////////////////
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reg length_1024_max;
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always@(posedge rxclk or posedge reset) begin
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if(reset)
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length_1024_max <=#TP 0;
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else
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length_1024_max <=#TP get_terminator & (frame_cnt>1024) & (frame_cnt <=`MAX_VALID_LENGTH);
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end
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//////////////////////////////////////////////
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// Count for Control Frames Received OK
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//////////////////////////////////////////////
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//how to indicate a control frame(not clearly specificated in 802.3
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///////////////////////////////////////////////
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// Count for Oversize Frames Received OK
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///////////////////////////////////////////////
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reg jumbo_frame;
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always@(posedge rxclk or posedge reset) begin
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if(reset)
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jumbo_frame <=#TP 0;
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else
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jumbo_frame <=#TP get_terminator & jumbo_enable & (frame_cnt > `MAX_VALID_LENGTH) & (frame_cnt < `MAX_JUMBO_LENGTH);
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end
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endmodule
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