RE: [IBIS] BIRD95: Power Integrity Analysis Using IBIS

The IBIS keyword that loosely associates power and ground pins with groups
of buffers is [Pin Mapping], not [Series Pin Mapping]. Certainly the name of
the [Series Composite Current] keyword is unimportant compared to the
technical issues. But if further discussion of other issues leads to a
revision of the BIRD, I think that will be a sufficient sign of hope to
warrant reconsideration of the keyword name.

Mike

-----Original Message-----
From: Syed Huq [mailto:shuq@cisco.com]
Sent: Saturday, January 08, 2005 2:47 PM
To: Mike LaBonte
Cc: ibis
Subject: RE: [IBIS] BIRD95: Power Integrity Analysis Using IBIS

Mike, Thanks for your comments, some of my responses in-line - Syed

On Fri, 2005-01-07 at 10:57, Mike LaBonte wrote:

> 5) Why is it called [Series Composite Current]? If this is the series
> current into the power port of the buffer what would be called the
> shunt current? Inside the buffer we might regard this current as a
> composite of pullup, predriver, and various capacitance currents. But
> treating the buffer as a black box, isn't there only one I/O (excluding
clamp) power terminal?
> Could we call it [Power Current]? That would also make for a neater
> syntax if there ever is a [Ground Current] keyword.
>

The first version of the BIRD was using Series Pin Mapping to show how the
PWR GND nodes are connected etc and as such we wanted a new keyword for the
IvsT to have some relation to that. So the name [Series Composite Current].
We will wait further before making more changes to keyword names.

Regards,
Syed

--
IBIS Vice-Chair & Webmaster
Cisco Systems, Inc
-----------------------------------------------------------------
|For help or to subscribe/unsubscribe, email majordomo@eda.org
|with 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 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