[SI-LIST] Re: Beyond Rail Operation in IBIS
- From: "Volk, Andrew M" <andrew.m.volk@xxxxxxxxx>
- To: amahajan@xxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 17 Oct 2002 11:44:11 -0700
It is important if your signal goes any significant amount beyond the rail.
Series terminated buses like PCI depend on the clamping diodes for signal
integrity, to stop excessive reflections that can also impact timing. Some
interfaces depend on them to limit the voltage swing at the receiver to safe
limits on newer processes. If you need to check for these kind of effects,
the clamps are essential.
Andrew Volk
Intel Corp.
-----Original Message-----
From: Abhijit Mahajan [mailto:amahajan@xxxxxxxxxxxx]
Sent: Thursday, October 17, 2002 11:15 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Beyond Rail Operation in IBIS
It is often difficult to get accurate curves for beyond rail
operation of IO Buffers. The problem is mainly in diode models that
are not accurate and results in 100s of Amps of current.
I am sure this question has been asked before,
"How important is it to have accurate beyond rail curves? Does the IBIS
spec. allow models to not have IV curves beyond rail voltages?"
Thanks for your help.
Abhijit.
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