Subversion Repositories smii

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

////                                                              ////

////  SMII                                                        ////

////                                                              ////

////  Description                                                 ////

////  Low pin count serial MII ethernet interface                 ////

////                                                              ////

////  To Do:                                                      ////

////   -                                                          ////

////                                                              ////

////  Author(s):                                                  ////

////      - Michael Unneback, unneback@opencores.org              ////

////        ORSoC AB          michael.unneback@orsoc.se           ////

////                                                              ////

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

////                                                              ////

//// Copyright (C) 2009 Authors and OPENCORES.ORG                 ////

////                                                              ////

//// 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                     ////

////                                                              ////

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

module obufdff

  (

   input d,

   output reg pad,

   input clk,

   input rst

   );

   always @ (posedge clk or posedge rst)

     if (rst)

       pad <= #1 1'b0;

     else

       pad <= #1 d;

endmodule // obufdff

module ibufdff

  (

   input pad,

   output reg q,

   input clk,

   input rst

   );

   always @ (posedge clk or posedge rst)

     if (rst)

       q <= #1 1'b0;

     else

       q <= #1 pad;

endmodule // ibufdff

module iobuftri

  (

   input i,

   input oe,

   output o,

   inout pad

   );

   assign #1 pad = oe ? i : 1'bz;

   assign #1 i = pad;

endmodule // iobuftri

module obuf

  (

   input i,

   inout pad

   );

   assign #1 pad = i;

endmodule // iobuftri