[SI-LIST] Re: How to convert Hspice model

Joel,

Don't forget that Eldo or Hspice could take several hours to a day just =
to
simulate a single channel. The purpose of IBIS or any behavioral models =
like
AMS or DML macromodels is to speed up the sim time while maintaining the
accuracy as spice. Simulation with Eldo or Hspice in the background of
Hyperlynx/ICX/Allegro SI does nothing but a pure spice sim. Only =
advantage
is one can perform 'what-if' analysis of interconnects on the fly.

Therfore, to achieve both speedup and accuracy, each tool must be =
capable of
using behavioral models. ICX and Allegro SI does it already and =
Hyperlynx is
on the way.

Use of macromodels is the ultimate solution. IBIS is already capable of
incorporating such models.

Regards,
Mohammad

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Kai Keskinen
Sent: Tuesday, February 28, 2006 2:01 PM
To: joel@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: How to convert Hspice model

Joel:

I assume the Vitesse driver is in encrypted HSPICE so you need HSPICE
(Synopsys) to perform a SPICE to IBIS translation. It is much more =
difficult
and time consuming with differential, CML type logic with various
pre-emphasis levels to create good quality IBIS models but it can be =
done. A
simple CMOS buffer is really easy with spice2ibis.

It seems like you need to get an HSPICE license to finish your =
simulations.
Now that it can use frequency dependent S parameter data to perform time
domain simulations, it has become much more powerfull for us SI people. =
The
investment in one seat is a very small fraction of the cost of =
respinning a
board.


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Joel Brown
Sent: Monday, February 27, 2006 7:52 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] How to convert Hspice model


I recently requested an IBIS model for a part made by Vitesse.
Vitesse responded by sending a Hspice model and said that IBIS does not
work well at 3 Gbps.
I am using Hyperlynx simulator. It can co-simulate with Hspice but we do
not have Hspice simluator.
Hyperlynx can simulate using the following models: .EBD, .IBS, .PML,
SPICE, S-Parameter (Touchstone).
I have seen programs that convert Hspice to Ibis but I am not sure if I
will loose the high frequency modeling of the Hspice file.
I would appreciate any suggestions on how to handle this Hspice spice
model without having an Hspice simulator.


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