[IBIS] Overshoot/Undershoot specs.

This text is taken from the 4.2 IBIS spec.

---------------------------
The static overshoot subparameters provide the DC voltage
values for which the model is no longer guaranteed to function
correctly.  Typically these are voltages that would cause the
physical component to be destroyed.
--------------------------

This is a bit confusing, since what we get from our component vendors
are two diffrent levels, one that will garantuee function and 
one that will garantuee that the component is not destroyed.

And sometimes we get similar data for dynamic overshoot/undershoot
parameters.

The question is how to interpret the spec. are the spec talking about
function or are the spec disussing destruction?
As a user my design will have to fulfill my function so to me it would
make sense it it did specify function requirements,
but as the spec is not clear here I do not know what component vendors
put in their models.

Is there a need to separate this two diffrent parameters in the IBIS
spec?

Best /Anders


---------------------------------------------------------------
Anders Ekholm
Senior Specialist Signal Integrity
CDU and DXU HW design

Ericsson Product Development Unit BTS
SE-164 80 Stockholm, Sweden
Tel: +46 8 404 27 58
Fax: +46 8 757 23 40
email: anders.ekholm@ericsson.com
---------------------------------------------------------------





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