[SI-LIST] Re: How to convert Hspice model
- From: "Hargin, Bill" <bill_hargin@xxxxxxxxxx>
- To: <joel@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 27 Feb 2006 18:09:54 -0800
Hi Joel:
The biggest issues with IBIS at these speeds are essentially as follows:
1. Potential "over-clocking" of the IBIS model: if you drive the model,
for example under much faster conditions than the rate for which data
was collected for the IBIS model, you may end up with an inaccurate
model.
2. The possibility of increasingly-inaccurate "DC creep" across many bit
transitions.
3. Most transceivers that can operate at super-fast speeds - as compared
to historic IBIS models - include features like driver pre-emphasis,
and/or receiver equalization. IBIS doesn't offer an elegant solution to
the need for flexibility, as far as twiddling with pre-emphasis and
equalization.
These issues grow gradually more significant at higher speeds, as you
might expect.
It may be possible for Vitesse to convert these models to Eldo (a
Mentor-based SPICE package that works with Mentor high-speed tools). If
they're interested, they can contact me. As a longer-term possibility,
perhaps Vitesse would be interested in porting the model over to AMS.
(Again, have them contact me if they're interested.) This, of course,
won't help with your current project, but HyperLynx will include AMS
support with the next release (June) ... The same support that is
included with ICX today.
Bill Hargin
High-Speed Marketing Manager
Mentor Graphics Corp.
Systems Design Division
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=20
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Joel Brown
> Sent: Monday, February 27, 2006 4:52 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] How to convert Hspice model
>=20
> I recently requested an IBIS model for a part made by Vitesse.
> Vitesse responded by sending a Hspice model and said that=20
> IBIS does not work well at 3 Gbps.
> I am using Hyperlynx simulator. It can co-simulate with=20
> Hspice but we do not have Hspice simluator.
> Hyperlynx can simulate using the following models: .EBD,=20
> .IBS, .PML, SPICE, S-Parameter (Touchstone).
> I have seen programs that convert Hspice to Ibis but I am not=20
> sure if I will loose the high frequency modeling of the Hspice file.
> I would appreciate any suggestions on how to handle this=20
> Hspice spice model without having an Hspice simulator.
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> -- Binary/unsupported file stripped by Ecartis --
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> -- File: joel.vcf
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