Subversion Repositories ethernet_tri_mode

//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Clk_ctrl.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
// 
 
module Clk_ctrl(   
Reset			,
Clk_125M		,
//host interface,
Speed			,
//Phy interface	,
Gtx_clk			,
Rx_clk			,
Tx_clk			,
//interface clk ,
MAC_tx_clk		,
MAC_rx_clk		,
MAC_tx_clk_div	,
MAC_rx_clk_div	
);
input			Reset			;
input			Clk_125M		;
				//host interface
input	[2:0]	Speed			;		
				//Phy interface			
output			Gtx_clk			;//used only in GMII mode
input			Rx_clk			;
input			Tx_clk			;//used only in MII mode
				//interface clk signals
output			MAC_tx_clk		;
output			MAC_rx_clk		;
output			MAC_tx_clk_div	;
output			MAC_rx_clk_div	;
 
 
//******************************************************************************
//internal signals                                                              
//******************************************************************************
wire			Rx_clk_div2	;
wire			Tx_clk_div2	;
//******************************************************************************
//                                                              
//******************************************************************************
assign Gtx_clk 		=Clk_125M					;
assign MAC_rx_clk	=Rx_clk						;
 
CLK_DIV2 U_0_CLK_DIV2(
.Reset			(Reset			),
.IN				(Rx_clk         ),
.OUT            (Rx_clk_div2	)
);
 
CLK_DIV2 U_1_CLK_DIV2(
.Reset			(Reset			),
.IN				(Tx_clk         ),
.OUT            (Tx_clk_div2	)
);
 
CLK_SWITCH U_0_CLK_SWITCH(
.IN_0			(Rx_clk_div2	),
.IN_1           (Rx_clk			),
.SW             (Speed[2]		),
.OUT            (MAC_rx_clk_div	)
);
 
CLK_SWITCH U_1_CLK_SWITCH(
.IN_0			(Tx_clk			),
.IN_1           (Clk_125M		),
.SW             (Speed[2]		),
.OUT            (MAC_tx_clk		)
);
 
 
CLK_SWITCH U_2_CLK_SWITCH(
.IN_0			(Tx_clk_div2	),
.IN_1           (Clk_125M		),
.SW             (Speed[2]		),
.OUT            (MAC_tx_clk_div	)
);
endmodule