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olivier.gi |
//----------------------------------------------------------------------------
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// Copyright (C) 2009 , Olivier Girard
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the authors nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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// OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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// THE POSSIBILITY OF SUCH DAMAGE
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//
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//----------------------------------------------------------------------------
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//
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// *File Name: io_cell.v
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//
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// *Module Description:
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// I/O cell model
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//
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// *Author(s):
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// - Olivier Girard, olgirard@gmail.com
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//
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//----------------------------------------------------------------------------
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// $Rev: 103 $
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// $LastChangedBy: olivier.girard $
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// $LastChangedDate: 2011-03-05 15:44:48 +0100 (Sat, 05 Mar 2011) $
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//----------------------------------------------------------------------------
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module io_cell (
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// INOUTs
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pad, // I/O Pad
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// OUTPUTs
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data_in, // Input value
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// INPUTs
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data_out_en, // Output enable
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data_out // Output value
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);
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// INOUTs
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//=========
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inout pad; // I/O Pad
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// OUTPUTs
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//=========
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output data_in; // Input value
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// INPUTs
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//=========
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input data_out_en; // Output enable
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input data_out; // Output value
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//=============================================================================
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// 1) I/O CELL
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//=============================================================================
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assign data_in = pad;
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assign pad = data_out_en ? data_out : 1'bz;
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endmodule // io_cell
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