[SI-LIST] Re: IBIS Model for Multi-Chip Package
- From: Scott McMorrow <scott@xxxxxxxxxxxxxxxx>
- To: tom_dagostino@xxxxxxxxxxx
- Date: Thu, 26 Jul 2001 11:53:06 -0700
Aaron,
I agree with Tom. An IBIS EBD will model this very well.
We used EBD models for Intel Xeon processor cartridge
modeling and had extremely good correlation to actual
circuit operation. We also use them for modeling of DDR
DIMM memory modules.
regards,
scott
--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR 97062-3090
(503) 885-1231
http://www.siqual.com
"Dagostino, Tom" wrote:
> Try an EBD model
>
> Tom Dagostino
> Modeling Manager
> Mentor Graphics Corp.
> SAE
> tom_dagostino@xxxxxxxxxx
> 503-685-1613
>
> -----Original Message-----
> From: Aaron Frank [mailto:aaron@xxxxxxxxxxxxx]
> Sent: Wednesday, July 25, 2001 7:25 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] IBIS Model for Multi-Chip Package
>
> Hi All,
>
> I am looking for feedback on how to accurately create an IBIS file for a
> multi-chip package.
> I have a device with several die on a single substrate, and my concern is
> that simply lumping the package and driver parasitics will not represent the
> substrate routing traces well enough.
>
> For discussion purposes, assume the device package is a BGA containing two
> die on a common substrate. Both die are connected in parallel, with most
> signals going from the ball through a 1" trace to the die. Some signals are
> star topology, some are daisychain.
>
> For reference, the device is intended for clock speeds of 100-200MHz, with
> very wide bus synchronous data transfers.
>
> Options include:
> (a) Single IBIS file for complete package (preferred) with lumped
> parasitics and ignoring substrate routing traces
> (b) IBIS of each die with recommendations on external transmission lines
> (substrate) to connect them
> (c) Combination of IBIS of each die with Spice model of substrate
> (d) ?
>
> Any opinions, tradeoffs, recommendations are appreciated.
>
> Thanks,
> AAron
>
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