00readme.txt

This directory contains IBIS Version 4.0 approved July 19, 2002 by the
EIA IBIS Open Forum.

The contents are:

  00readme.txt      This File
  ver4_0.ibs        IBIS Version 4.0
  ver4_0.txt        IBIS Version 4.0 with .txt extension
  ver4_0.pdf        IBIS Version 4.0 with .pdf extension
  ver4_0.doc        IBIS Version 4.0 with .doc extension
  ver4_0.ps         IBIS Version 4.0 with .ps extension

  tree4_0.txt       Unofficial tree diagram of IBIS Version 4.0 syntax 
                    (Produced by Michael Mirmak of Intel) 

  ver4.0_wip/ A work in progress directory showing the BIRD additions

The new features based on 11 approved BIRDs contained in Version 4.0
consist of these extensions:

  Enhanced characterization of Receiver Thresholds to allow more detailed
    threshold specification consistent with single-ended and differential
    SSTL-2 and related technologies (BIRD62.6).  Added keywords:
      [Receiver Thresholds] with 15 subparameters
      [External Reference] (for an external reference voltage)

  Package model selection specification for even/odd mode cases or other
    reasons (BIRD64.4).  Added keywords:
      [Alternate Package Models]/[End Alternate Package Models]

  Subparameter to split C_comp to up to four reference voltages (BIRD65.2 and
    BIRD76.1).  Added subparameter to [Model]:
      C_comp_pullup, C_comp_pulldown, C_comp_power_clamp, C_comp_gnd_clamp

  Subparameter additions to [Model Spec] to add min and max values and to
    add PCI-X specific timing test loads (BIRD66 and BIRD71).  Added
    subparameters:
      Vref, Cref, Rref, Vref_rising, Vref_falling, Cref_rising, Cref_falling,
      Rref_rising, Rref_falling, Vmeas_rising, Vmeas_falling

  Increase the V-T table limit from 100 to 1000 points (and editorially
    documenting this change as rows) (BIRD67.1).

  Editorially clarifying that the [Rising Waveform] and [Falling Waveform]
    tables should be correlated to a common reference to preserve relative
    delays for better overclocking simulations (BIRD68.1).

  Golden Waveforms are added for single-ended and differential references
    (BIRD70.5).  Added keywords:
       [Test Data] with 4 subparameters and eight keywords:
          [Rising Waveform Near], [Falling Waveform Near],
          [Rising Waveform Far], [Falling Waveform Far],
          [Diff Rising Waveform Near], [Diff Falling Waveform Near],
          [Diff Rising Waveform Far], [Diff Falling Waveform Far]
       [Test Load] with 21 subparameters for describing a test network

  An generalization of the [Series MOSFET] description to allow it to be used
    for both NMOS and/or PMOS technologies and to allow for non-monotonic
    tables typical of parallel NMOS and PMOS switches (BIR72.3).

  An additional Fall_back Submodel_type and related documentation to 
    describe a technology where the driver is switched during the transition
    to a weaker strength for better termination matching and lower SSO noise
    (BIRD 73.4).  Added Submodel_type subparameter argument:
       Fall_back

Last updated: March 10, 2004