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acapola |
`timescale 1ns / 1ps
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`default_nettype none
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acapola |
/*
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Author: Sebastien Riou (acapola)
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Creation date: 17:14:04 01/29/2011
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$LastChangedDate: 2011-01-29 13:16:17 +0100 (Sat, 29 Jan 2011) $
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$LastChangedBy: acapola $
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$LastChangedRevision: 11 $
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$HeadURL: file:///svn/iso7816_3_master/iso7816_3_master/trunk/test/Iso7816_directionProbe.v $
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This file is under the BSD licence:
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Copyright (c) 2011, Sebastien Riou
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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The names of contributors may not be used to endorse or promote products derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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`default_nettype none
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/*
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Models a probe which consist only of wires. Propagation delay over the sio line
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is used to determined the direction of the communication:
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If the terminal send a start bit, the termMon output will go low before cardMon and viceversa:
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sio line
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Terminal ---------------------------------- Card
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termMon cardMon
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Note for a physical implementation:
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The difference between the delay "Terminal to termMon" and the delay "Card to cardMon"
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should be kept small in comparison to the delay "Terminal to/from Card" (considering falling edge delay)
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In this model, delays are 0 except the delay over the sio line.
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*/
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acapola |
module Iso7816_directionProbe(
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inout wire isoSioTerm,
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inout wire isoSioCard,
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output wire termMon,
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output wire cardMon
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);
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TriWirePullup sioLine(.a(isoSioTerm), .b(isoSioCard));
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assign termMon = isoSioTerm;
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assign cardMon = isoSioCard;
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endmodule
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acapola |
`default_nettype wire
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