RE: Re[2]: Connector spec swathing

Gus,

(Hoping we are one step towards closure!!)

You wrote...

> The draw back to simulators... they need to bang out some code that
creates a
> matrix from a small matrix as limited by the keywords. From what I have
been
> told, this is not very difficult

This is the procedure I (and Fred?) are concerned about. It may not be
difficult but it sure seems ambiguous for cases not covered by Bob's
posting. If this mapping is described in detail or implemented within the
parser then I believe we will all be happy. The data files contain swaths
but we can query against a full matrix--which doesn't mean we're going to
SIMULATE the full matrix it just means we can reduce it to the pins we're
interested in. Fred is right--there is confusion between on this thread
between data presentation and simulation. Just because we want a full
matrix doesn't mean we're going to SIMULATE a full matrix.

Fred is also NOT saying "don't use the swath."

Perhaps the confusion is that you think we're saying that the Full Matrix
should be explicitly described in the file. No, we're saying USE the swath,
but define the expansion rigorously or build it into the parser. When we
say we want the Full Matrix, we're NOT saying it should be spelled out
explicitly in the file--we're saying we must be able to perform the swath
mapping correctly for all possible cases.

Chris Rokusek
Innoveda

> -----Original Message-----
> From: apanella@molex.com [mailto:apanella@molex.com]
> Sent: Friday, June 16, 2000 5:30 AM
> To: fred
> Cc: ibis@eda.org
> Subject: Re[2]: Connector spec swathing
>
>
>
>
> The swath... allows automatic building of a "banded" matrix from a smaller
> matrix.
>
> The goal of the keywords around the swath are present such that
> the person that
> creates the model can give enough information to a simulator to
> build the banded
> matrix from the smaller matrix.
>
> How does the swath help...???
>
> * Let's say I manufacture a connector line that has 50, 100,
> 500, 750, 1000
> pins in a "5 by X" PHYSICAL configuration. I now need to have 5 models to
> support this connector line. Instead... with a SWATH, I can
> create a 50 pin
> model... then all the other variations can be derived from that
> model. This is
> done by using the smallest (50 pin, 5 x 10) matrix to generate a
> bigger matrix.
>
> In this example.... The benefits are as follows
> *** 1 file instead of five
> *** The single file only needs about 10 extra lines to cover the
> 5 combinations
> *** The single file could just as easily cover 100 combinations
> (or 100 models)
>
>
> ~~~AN example to show the benefits..
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Considering there is somewhere between 10 to 50 connector sizes
> per connector
> family and there are at least 100 Connector families per
> connector company, You
> might also see how the model database may be easier to manage and update.
>
> Original case:
> 10 to 50 models per family x 100 Connector families
>
> yields 1000 to 5000 model files x Lets just say 5 connector
> companies (we
> know that there are at least 500 Connector companies out there)
>
> yields 5000 to 25000 separate models
>
>
> OK... NOW.. Same example... but SWATHED..
>
> 10 to 50 models per family x 100 Connector families
>
> yields 10 to 50 model files x Lets just say 5 connector
> companies (we know
> that there are at least 500 Connector companies out there)
>
> yields 50 to 250 separate models.
>
>
> Assuming that a banded matrix is correct, I know which option I
> would rather
> work with....
> ** as a SIMULATOR company (SI Simulation, SPICE or non-SPICE)
> ** or as a MODEL MAKER (Connector Company)
> ** or as a MODEL USER (the person who uses the SI Tool and the
> Connector company
> models)....
>
>
>
> The Drawbacks
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> The draw back to simulators... they need to bang out some code
> that creates a
> matrix from a small matrix as limited by the keywords. From what
> I have been
> told, this is not very difficult
>
> The draw back to Connector companies.
> We need to make sure we appropriately use the supplied swath keywords
>
> The drawback to Connector Company Customers and Simulator Company
> Customers...
> ?????
>
>
> _gus: 630-527-4617
<snip>
Received on Fri Jun 16 09:56:35 2000