[ibis-macro] Re: BIRD-125: ISS as package-model
- From: "Walter Katz" <wkatz@xxxxxxxxxx>
- To: <kukal@xxxxxxxxxxx>, "'IBIS-ATM'" <ibis-macro@xxxxxxxxxxxxx>
- Date: Thu, 13 Jan 2011 10:10:30 -0500 (EST)
Kukal,
ISS supports s parameter instances. I agree with you on the complexity of
BIRD-125. Although some applications do require package models for either
the whole package or a section of the package, these models are unwieldy.
I think that it is important that any package solution have the following
capabilities:
1. Ability to specify either singled ended and/or differential
models for each single ended or differential pin of the package.
2. Ability to specify a range of single ended/differential package
models for each [Model].
3. Ability to specify a range of coupled package models for each
[Model]
4. Ability to specify a range of coupled package models for each
pin/diff pin.
5. Ability to specify package models that ties to die pads and
package pins, and that it support a different number of die pads and
package pins, and also support many-to-few and few-to-many networks of
supply nodes between the die pads and package pins of supply nets.
Walter
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Taranjit Kukal
Sent: Thursday, January 13, 2011 2:26 AM
To: IBIS-ATM
Subject: [ibis-macro] BIRD-125: ISS as package-model
Hi Arpad,
The BIRD surely bridges a gap that was very important as almost every
package needs to be an s-parameter model at MGH.
However, it seems that the BIRD requires the user to always specify one
sub-circuit for the whole package. So, if the package had 8, 16, or 100
pins then the user needs to provide a 16, 32, or 200 terminal subckt,
respectively.
We always get package models as models for single pins or diff-pin(s). I
think we should extend the BIRD to include subcircuits per pin (and
per-diff-pin) and may be cover cases where several smaller sub circuits
can be assigned to subsets of the package pins.
Another minor thing is that we are forcing the user to wrap s-parameter
files into ISS - Not sure if the syntax should allow direct s-parameter
instantiation.
This is a surely not a big issue.
rgds
..kukal
Taranjit Kukal | Product Engineering Architect
P: 91 120 3984000 <http://www.cadence.com/> www.cadence.com
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