Subject: RE: [IBIS-Users] Measurement deratings?
From: Muranyi, Arpad (arpad.muranyi@intel.com)
Date: Wed May 28 2003 - 11:35:44 PDT
Tim,
IBIS doesn't have to provide this derating construct in order
for you to make an IBIS model with derating. You measure your
data, import it into your favorite spreadsheet, and massage it.
After that you can make your IBIS model with the massaged data.
Arpad
===============================================================
-----Original Message-----
From: Timothy Coyle [mailto:timothy.coyle@sun.com]
Sent: Wednesday, May 28, 2003 8:48 AM
To: John Phillippe
Cc: ibis-users@eda.org
Subject: Re: [IBIS-Users] Measurement deratings?
John Phillippe wrote:
>
> Hello,
> I am wondering how people match their IBIS simulations to silicon
> measurements. I read through the spec, and didn't see anything that
> looked like a derating type construct. So it is my understanding that
> when someone takes lab measurements of an I/O buffer, those data points
> are directly inserted into the ibis file, replacing the simulated data.
> Does this sound correct? Is there another way, to get simulations to
> more closely match measurements?
>
> --
> John Phillippe
> SPS, 32 Bit Embedded Controller Division, IC Creation
> Motorola - 512-895-1835
> Austin, TX - john.phillippe@motorola.com
>
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Hi John,
Not sure if you are talking about transmission line simulations or just the
IBIS data itself, but here is my 2 cents. If your IBIS file was created from
SPICE models, the real correlation should be between your SPICE simulations
and real silicon. A good methodology might be to correlate your SPICE models
to silicon, then translate your SPICE models to IBIS, and correlate your
IBIS file to your SPICE model. If your SPICE models do not correlate well to
silicon, you could extract IBIS data from
the bench and insert into your IBIS file. This should make your IBIS file
correlate better to silicon. It will be more difficult to get your min and
max
data from the lab than from simulation.
Regards,
Tim
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