Re: [IBIS-Users] IBIS Model Usage:

Hi, Arpad,

True, only typ values are required.

What I intended to say was that corner data, if
available, goes in the same [Model] and file. And
that the other two columns must have entries, even
if these are just NA.

[Note to modelers]
* To create a separate min or max IBIS model
requires a different model name. There are known
"bad" options: a) Keep typ data, and replace one
NA column with data values. b) Reduce "typ"
column to two entries, with NA for intermediate
points, and replace one NA column with data
values. c) Create 3 files with only "typ" data
(each file a different physical corner).
* This BREAKS automated tool flow, since [Pin] can
assign only one model to an I/O.
* Also, any of these methods can quickly become a
can of worms (= completely unmanageable) for model
users. And a rat hole (= much time wasted) for
whoever supports (created) that model.

Cheers,
Lynne

On 5/10/2011 1:12 PM, Muranyi, Arpad wrote:
>
> Lynne,
>
> Strictly speaking only typical is REQUIRED in an
>
> IBIS file...
>
> Arpad
>
> ==================================================
>
> *From:*owner-ibis-users@eda.org
> [mailto:owner-ibis-users@eda.org] *On Behalf Of
> *Lynne D. Green
> *Sent:* Tuesday, May 10, 2011 2:13 PM
> *To:* Muniswara Reddy Vorugu
> *Cc:* 'ibis-users'
> *Subject:* Re: [IBIS-Users] IBIS Model Usage:
>
> Hello, Muniswara,
>
> IBIS _requires_ all 3 corners in the SAME file,
> and IBIS-related tools expect this. As Arpad
> noted, submodels can be used to model additional
> corners. Separate models or files for the 3
> corners might be useful for other tools, but not
> for IBIS.
>
> The IBIS Model Review Committee exists to help
> model makers. Files should be checked with
> ibischk5 prior to submission.
> http://www.eda.org/ibis/home/support/support.htm
>
> Regards,
> Lynne Green
>
> Chair, IBIS Model Review Committee
>
>
> On 5/9/2011 10:20 PM, Muniswara Reddy Vorugu wrote:
>
> Hi,
>
> For better delivery of IBIS model, we want to
> know better ways to get usablility and manage
> our deliverables.
>
> To make this balance, I want to understand the
> following:
>
> 1: What are the advantages of min/typ/max
> corners merged in single file, over 3 files with
> one corner per file?
>
> What is the difficulty for running Min/Typ/Max
> corners analysis.
>
> Are there any Fundamental analysis limitations?
>
> Regards,
>
> Muniswara
>
>

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