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I/O signaling circuit

  • US 6,351,691 B1
  • Filed: 10/15/1998
  • Issued: 02/26/2002
  • Est. Priority Date: 10/15/1998
  • Status: Expired due to Term
First Claim
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1. An integrated I/O signaling circuit capable of operating in one of a plurality of modes for bi-directionally exchanging information over a single path with a remote secondary processing device, said I/O signaling circuit comprising:

  • a power supply having a ground and a high potential output;

    a high potential terminal that receives said high potential from said power supply;

    a low potential terminal;

    a first variable impedance device connected between said high potential terminal and said low potential terminal;

    a second variable impedance device connected between said low potential terminal and ground;

    a first circuit for controlling the impedance of said first variable impedance device;

    a second circuit for controlling the impedance of said second variable impedance device; and

    wherein said first circuit and said second circuit and said first variable impedance device and said second variable impedance device configure said I/O signaling circuit to operate in one of said plurality of modes for exchanging signals with said remote secondary processing device over said single path.

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