Subject: Re: [IBIS-Users] Using IBIS models for VDD droop & Ground Bounce
From: Zhiping Yang (zhiping@cisco.com)
Date: Tue Jun 10 2003 - 10:09:07 PDT
HI Arpad,
Can you clarify a little bit more on this? Do you have any papers or
presenations on this topic? For my understanding, it is impossible or very
difficult to model the cross-bar current in IBIS model, but the cross-bar
current is very important for power delivery system simulation. About one
year ago, I did some simulation comparasions between HSPICE model and IBIS
model in power integrity. At that time, the IBIS model behaviored very poor
for some kinds of I/O buffer. I would be very interested to be updated on
new IBIS capabilities on power delivery system simulations. Thanks.
Zhiping
Zhiping Yang. Ph.D.
Signal Integrity Engineer
CISCO SYSTEMS
170 West Tasman Dr.
San Jose, CA 95134
Phone: 408-525-5690
Fax: 408-525-5690
E-mail: zhiping@cisco.com
This Message and any attached documents contain confidential information of
CISCO Systems, Inc. and its affiliates and may be used only by the intended
recipient(s) of this communication for the purpose set forth and in a manner
consistent with your agreement with Cisco Systems, Inc. to preserve its
confidential information.
----- Original Message -----
From: "Muranyi, Arpad" <arpad.muranyi@intel.com>
To: <ibis-users@eda.org>
Sent: Tuesday, June 10, 2003 9:43 AM
Subject: RE: [IBIS-Users] Using IBIS models for VDD droop & Ground Bounce
> John,
>
> Sorry for the late reply. We do use IBIS models for what we
> call "Power Delivery" simulations (which is the same thing
> you asked about). However, we only use the buffer model in
> IBIS format, and have a more accurate package and PDN model
> in different formats.
>
> The new ICM (IBIS Interconnect Model Specification) provides
> (now) a much more accurate way to model the passive circuits,
> but the new language extensions to the buffer modeling
> capabilities of IBIS (BIRD75) will provide further improvements
> for buffer modeling also.
>
> As soon as tools begin to support these new features we will be
> able to do very accurate power delivery simulations using IBIS
> files for the passive as well as the active circuits.
>
> Arpad Muranyi
> Intel Corporation
> ===============================================================
>
> -----Original Message-----
> From: John Phillippe [mailto:john.phillippe@motorola.com]
> Sent: Thursday, May 08, 2003 2:27 PM
> To: ibis-users@eda.org
> Subject: [IBIS-Users] Using IBIS models for VDD droop & Ground Bounce
>
>
> I'm curious as to how many people use IBIS models to simulate VDD Droop
> and Ground Bounce. Is IBIS even a worthwhile format to try this with?
> Do current simulators do anything with regards to modeling the voltage
> drops across the powerbus on the chip?
>
> --
> John Phillippe
> SPS, 32 Bit Embedded Controller Division, IC Creation
> Motorola - 512-895-1835
> Austin, TX - john.phillippe@motorola.com
> |------------------------------------------------------------------
> |For help or to subscribe/unsubscribe, email majordomo@eda.org
> |with just the appropriate command message(s) in the body:
> |
> | help
> | subscribe ibis <optional e-mail address, if different>
> | subscribe ibis-users <optional e-mail address, if different>
> | unsubscribe ibis <optional e-mail address, if different>
> | unsubscribe ibis-users <optional e-mail address, if different>
> |
> |or email a written request to ibis-request@eda.org.
> |
> |IBIS reflector archives exist under:
> |
> | http://www.eda.org/pub/ibis/email_archive/ Recent
> | http://www.eda.org/pub/ibis/users_archive/ Recent
> | http://www.eda.org/pub/ibis/email/ E-mail since 1993
>
|------------------------------------------------------------------
|For help or to subscribe/unsubscribe, email majordomo@eda.org
|with just the appropriate command message(s) in the body:
|
| help
| subscribe ibis <optional e-mail address, if different>
| subscribe ibis-users <optional e-mail address, if different>
| unsubscribe ibis <optional e-mail address, if different>
| unsubscribe ibis-users <optional e-mail address, if different>
|
|or email a written request to ibis-request@eda.org.
|
|IBIS reflector archives exist under:
|
| http://www.eda.org/pub/ibis/email_archive/ Recent
| http://www.eda.org/pub/ibis/users_archive/ Recent
| http://www.eda.org/pub/ibis/email/ E-mail since 1993
This archive was generated by hypermail 2b28 : Tue Jun 10 2003 - 10:11:39 PDT