00readme.txt

This directory contains IBIS Version 4.1 approved January 30, 2004 by the
EIA IBIS Open Forum.

The contents are:

  00readme.txt      This File
  ver4_1.ibs        IBIS Version 4.1
  ver4_1.txt        IBIS Version 4.1 with .txt extension
  ver4_1.pdf        IBIS Version 4.1 with .pdf extension
  ver4_1.doc        IBIS Version 4.1 with .doc extension
  ver4_1.ps         IBIS Version 4.1 with .ps extension

  tree4_1.txt       Unofficial tree diagram of IBIS Version 3.2 syntax 
                    (Produced by Michael Mirmak of Intel) 

  ver4.1_wip/ A work in progress directory showing the BIRD additions

The new features contained in Version 4.1, based on 10 approved BIRDs, 
consist of the following:

BIRD75.8 - Multi-Lingual Model Support
           Adds support for Berkeley SPICE, VHDL-AMS and Verilog-AMS
           models under IBIS, under the new keywords [External Model],
           [External Circuit], [Circuit Call] and [Node Declarations]

BIRD77.2 - Differential Subparameter Additions
           Adds new timing loads and Model_types to support
           differential buffers under the BIRD75.8 multi-lingual
           extensions

BIRD78.1 - Comment Line Length Limit
           Extends the maximum line length of a comment from 80 to
           120 characters

BIRD80.1 - Add External Reference Column to Pin Mapping Keyword
           Allows use of [External Reference] with [Pin Mapping]

BIRD81.1 - Clarify Usage Rule for [Pin] I/O Model Assignment
           Explicitly forbids assignment of Series or Series_switch model
           types to pins in the [Pin] section

BIRD82.2 - Clarification of Clamp Table Use
           Explicitly states that clamp data is to be considered "always
           present" to avoid double-counting of clamp effects.

BIRD83.2 - Series Element Clarifications
           Clarifies usage rules for [Series MOSFET] keyword subparameters
           and requires use of [Series Switch Groups] if 
           "function_table_group" is present

BIRD84.1 - Driver Schedule Clarifications
           Describes which [Model] subparameters are used with scheduled
           and top-level models.  Also defines events for triggering
           [Driver Schedule] delays.

BIRD85.3 - Slew Time Estimate Clarifications
           Requires the [Ramp] keyword in [Model]s which use
           [External Model] and clarifies how the [Ramp] data is
           generated in that case

BIRD86.1 - Clarification of Submodel Mode
           Explicitly states that the "All" Submodel mode can
           be used with any Submodel type

Last updated: March 10, 2004