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 1.2  2005/12/16 06:44:13  Administrator

// replaced tab with space.

// passed 9.6k length frame test.

//

// 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