[ibis-macro] What is a connection?

From: Walter Katz <wkatz@xxxxxxxxxx>
To: "IBIS-ATM" <ibis-macro@xxxxxxxxxxxxx>
Date: Fri, 13 Dec 2019 10:07:40 -0500 (EST)

All,

I/O Connectivity

The IBIS specification defines the electrical IV and VT characteristics of
an I/O buffer. It is fundamentally based on the fact that there is an
electrical path that can be defined between a Driving Output buffer and one
or more Input (and other Output) buffers. It is expected that the
transitions of the Driving Output Buffer are reflecting in transitions at
the Receiving Input buffers between Vinl and Vinh. One way of describing
these electrical connections between the I/O buffers are with IBIS ISS (and
Touchstone File) models. A connections is a "good" connection if the
transitions at the Driver generate transitions at the Receiver that satisfy
the receiver "rules" in the IBIS file. A good connection could have a low DC
impedance, or in some cases a low impedance at a Nyquist frequency.

Rail Connectivity

If two nodes in a rail distribution system are "connected" legally then
there is a "low" DC impedance between the two nodes. Again, "low" is
dependent on the current t flow and proper operation of the I/O buffers.

Walter

Walter Katz

<mailto:wkatz@xxxxxxxxxx> wkatz@xxxxxxxxxx

Office 978.461-0449 x 133

Mobile 720.417-3762

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[ibis-macro] What is a connection?

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