Subversion Repositories ethernet_tri_mode

//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Phy_sim.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. ////
////                                                              ////
//// 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  2005/12/13 01:51:44  Administrator
// no message
// 
 
`timescale 1ns/100ps 
 
module Phy_sim (
input			Gtx_clk					,//used only in GMII mode
output			Rx_clk					,
output			Tx_clk					,//used only in MII mode
input			Tx_er					,
input			Tx_en					,
input	[7:0]	Txd						,
output			Rx_er					,
output			Rx_dv					,
output 	[7:0]	Rxd						,
output			Crs						,
output			Col						,
input	[2:0]	Speed				
);
//////////////////////////////////////////////////////////////////////
// this file used to simulate Phy.
// generate clk and loop the Tx data to Rx data
// full duplex mode can be verified on loop mode.
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
// internal signals
//////////////////////////////////////////////////////////////////////
reg				Clk_25m			;//used for 100 Mbps mode
reg				Clk_2_5m		;//used for 10 Mbps mode
wire			Rx_clk			;
wire			Tx_clk			;//used only in MII mode
//////////////////////////////////////////////////////////////////////
always 
	begin
	#20		Clk_25m=0;
	#20		Clk_25m=1;
	end
 
always  
	begin
	#200	Clk_2_5m=0;
	#200	Clk_2_5m=1;
	end   
 
assign 	Rx_clk=Speed[2]?Gtx_clk:Speed[1]?Clk_25m:Speed[0]?Clk_2_5m:0;        
assign 	Tx_clk=Speed[2]?Gtx_clk:Speed[1]?Clk_25m:Speed[0]?Clk_2_5m:0;
 
assign	Rx_dv	=Tx_en	;
assign	Rxd		=Txd	;
assign	Rx_er	=0		;
assign	Crs    	=Tx_en	;
assign  Col		=0		;
 
endmodule