Should [Model Data] be required?

When the [Package Model] was introduced, in Bird 10.2, it probably made sense
to require [Model Data]. Without [Model Data], there would have been little
value in using a package model.

However, now (BIRDS 28.3 and 37.3, included in IBIS 3.0 and beyond) a package
model may have transmission line models for pins using sub-parameters Len,
L, R, C, Fork, and Endfork. This provides another reason to use a package
model. Yet the IBIS specification still requires [Model Data], which requires
at least a [Capacitance Matrix] and an [Inductance Matrix], even if no
coupling data is provided.

Question: does it still make sense to require [Model Data] in a package model?

***********************************************************************
* Geoffrey Ellis *
* Cadence Design Systems phone: 831-685-6559 *
* 9057 Soquel Drive fax: 831-685-6556 *
* Aptos, CA 95003 E-mail: geoff@cadence.com *
***********************************************************************
Received on Wed Oct 21 14:36:18 1998