Subversion Repositories ethmac10g

//////////////////////////////////////////////////////////////////////
//// 																					////
//// 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  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);
	 end
 
endmodule