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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  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        ,

Clk_25M,

Clk_125M_90,

Clk_25M_90,

//host interface,

Speed           ,

//Phy interface ,

Gtx_clk         ,

Rx_clk          ,

//Tx_clk          , //Replace this clock by Clk_25M

//interface clk ,

MAC_tx_clk_d    ,

MAC_tx_clk      ,

MAC_rx_clk      ,

MAC_tx_clk_div  ,

MAC_rx_clk_div

);

input           Reset           ;

input           Clk_125M        ;

input                   Clk_25M;

input                   Clk_125M_90;

input                   Clk_25M_90;

                //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  ;

output                  MAC_tx_clk_d;

//******************************************************************************

//internal signals                                                              

//******************************************************************************

wire            Rx_clk_div2 ;

wire            Tx_clk_div2 ;

wire                    transmit_clk;

wire            clk_125_0;

wire            clk_125_90;

wire            clk_25_0;

wire            clk_25_90;

assign clk_125_0        = Clk_125M;

assign clk_25_0         = Clk_25M;

assign clk_125_90       = Clk_125M_90;

assign clk_25_90        = Clk_25M_90;

//******************************************************************************

//                                                              

//******************************************************************************

assign MAC_rx_clk   =   Rx_clk;

assign MAC_tx_clk       =       transmit_clk;

assign Gtx_clk          =       transmit_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             (clk_25_0       ),

.OUT            (Tx_clk_div2    )

);

//

CLK_SWITCH_ALT2 U_0_CLK_SWITCH(

.IN_0           (Rx_clk_div2    ),

.IN_1           (Rx_clk         ),

.SW             (Speed[2]       ),

.OUT            (MAC_rx_clk_div )

);

//

//CLK_SWITCH_ALT2 U_2_CLK_SWITCH(

//.IN_0           (Tx_clk_div2    ),

//.IN_1           (clk_125_0      ),

//.SW             (Speed[2]       ),

//.OUT            ( )

//);

assign MAC_tx_clk_div = clk_125_0;

//CLK_SWITCH_ALT2 U_1_CLK_SWITCH(

//.IN_0           (clk_25_0             ),

//.IN_1           (clk_125_0      ),

//.SW             (Speed[2]       ),

//.OUT            (transmit_clk )

//);

assign transmit_clk = clk_125_0;

//

CLK_SWITCH_ALT2 U_3_CLK_SWITCH(

.IN_0           (clk_25_90    ),

.IN_1           (clk_125_90     ),

.SW             (Speed[2]       ),

.OUT            (MAC_tx_clk_d)

);

endmodule