[SI-LIST] Re: SSO using IBIS in HSPICE
- From: "Douglas Burns" <dburns@xxxxxxxxxx>
- To: <timothy.coyle@xxxxxxx>, "si list" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 9 May 2003 09:52:24 -0400
Tim,
When using IBIS in HSPICE, you have the option of what power to use. There
is a keyword "power={on|off}" that tells HSPICE what to use. If power=on
(the default condition), voltage sources are used with values taken from the
IBIS file. With power=off, you need to externally supply the voltage to the
cell. For your sim's you need to use power=off.
Doug
Douglas Burns
Chief Consultant
Signal Integrity Software Inc.
6 Clock Tower Place
Maynard, MA 01754
978-461-0449 x14
www.sisoft.com
dburns@xxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Timothy Coyle
Sent: Friday, May 09, 2003 9:40 AM
To: si list
Subject: [SI-LIST] SSO using IBIS in HSPICE
Hello,
I'm wondering if anyone has had any luck in implementing SSO simulations in
HSPICE using IBIS. I translated a HSPICE model to an
IBIS file to speed up simulation time and avoid nasty convergence issues.
Correlation between the two is very good for different
cases and loading. I have a 14 pin fully coupled SSO HSPICE package model.
When I try to use IBIS with the package model, the correlation
is not good. The problem is how do I tie the power and ground of the IBIS
file to the power and ground of the package model?
When you call an IBIS file in HSPICE, you use the internal voltages supplied
with the IBIS file. So maybe I can make the assumption
that the output signal is coming from ideal ground and power. If I make 14
calls, then they should be coming from the same power/ground, but
they are not. Even if I use Pin Mapping, will HSPICE recognize this? Even if
I could get the 14 IBIS calls to all go from the same
power/ground, how do I interface those to the package? (the power and
ground) I think you can supply external power/ground to the IBIS file (I've
never tried it before) might that be a way to tie the power and grounds
together? I'm also using HPSICE version 2002.2. This has a
new feature (or I believe it is new) to use .ebd and .pkg files.(using the
new IBIS buffer component .ibs) This won't help me in this situation, but
down the road can an .ebd file be used more effectively to simulate SSO?
Thanks in advance for any comments/suggestions/enlightenment,
Tim
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