[IBIS] BIRD75.7 - Multi-Lingual Model Support


Subject: [IBIS] BIRD75.7 - Multi-Lingual Model Support
From: Ross, Bob (bob_ross@mentorg.com)
Date: Fri Dec 20 2002 - 12:50:08 PST


To IBIS Committee:

BIRD75.7 is a complete rewrite of BIRD75.6, thanks to Michael Mirmak and
Arpad Muranyi. As a result it is better organized, more readable, and
contains many more examples. Since the document is quite large, please
find it uploaded under:

  http://eda.org/pub/ibis/birds/

Arpad Muranyi, Michael Mirmak, and Chris Reid have joined as co-authors
since all have contributed to helping clarify some major points.

This rewrite was prompted by a number of technical concerns and discussions
over a period of weeks to ensure that the syntax will support future
expansion. As a result, all previous |* lines are removed. This document
serves as a new base-line. A brief summary of significant changes is below
and also in the ANALYSIS PATH ... section at the end of BIRD75.7.

All of the existing syntax is retained with just a few additions noted
below. BIRD75.7 reflects and related rules reflect a changed emphasis.
With the exception of true differential circuits, [External Model] is
intended to support native IBIS methodology, and [External Circuit] is
allows more general future model support and support of the interconnect
specification.

List of some major changes:

1 - The presentation was reorganized, and the introductory material is
    significantly expanded. Several terms in the document are now defined.

2 - [External Model] used for "native" IBIS topologies only (except for
    retaining true differential circuit support). [Pin Mapping] instead of
    [Circuit Call] is used for [Model] connections with [External Model].

3 - [External Circuit] expanded to support models, including recognizing
    predefined controls and signals D_drive, D_enable, D_receiver.

4 - A_to_D and D_to_A are restricted to SPICE only.

5 - corner_name is added to the above conversions to support Typ/Min/Max
    corners.

6 - Language relating to supporting proprietary SPICE is removed.

7 - CIRCUITCALL signals an [External Circuit] connection to a pin.

8 - Required rules for C_comp* and [Ramp] were removed when [External Model]
    is used.

BIRD75.7 and BIRD77.2 should be considered together. Pending BIRD78.1 and
BIRD80 also support some related features.

Bob Ross
Mentor Graphics
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