[IBIS] RE: A slight spec/cookbook discrepancy

I was told that quoting from the Cookbook as a graphic
image didn't make it through the email reflector, so I
am resending my message with a textual quote of that
section.

Thanks,

Arpad
=======================================================

> _____________________________________________ 
> From: 	Muranyi, Arpad  
> Sent:	Monday, January 08, 2007 11:24 AM
> To:	ibis@eda.org
> Subject:	A slight spec/cookbook discrepancy
> 
> Happy New Year everyone!
> 
> I just noticed a slight discrepancy between the
> IBIS specification and the IBIS Cookbook.  Under
> the differential pin section the IBIS specification
> says the following:
> 
> |                                      The fourth, fifth, and
> | sixth columns, tdelay_typ, tdelay_min, and tdelay_max,
> | contain launch delays of the non-inverting pins relative to
> | the inverting pins.  All of the numerical entries may be a
> | positive, zero, or negative number.
> 
> The IBIS Cookbook, on the other hand, says this on pg. 73:
> 
> 
The IBIS section shown above would appear shortly after the pin list in
an IBIS file. The keyword requires six
parameters: the pin names to be treated differentially (the non-inverted
pin is always named first); the
differential threshold voltage if the buffer is capable of receiving
signals; and three time delays, expressing the
launch delays of the inverting pin in relation to the non-inverting pin
when the buffer drives (such delays would
be visible as skew, jitter and/or varying crossover voltages between the
signals).


> Which is correct?  I personally would prefer what the
> cookbook says, because I usually think of the non-inverting
> output as the "original", "unmodified", i.e. the reference.
> However, it may be easier to change the cookbook than the
> spec...
> 
> Thanks,
> 
> Arpad
> =============================================================

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