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IBIS 5.0 Pending Changes

IBIS 5.0 Pending Changes. IBIS 5.0 has several BIRDs already “queued” BIRD74.6 – EMI Parameters BIRD95.6 – Power Integrity Analysis using IBIS BIRD97.2/98 – Gate Modulation Effect BIRD103.1 – [Model Spec] DDR2 Over/Undershoot BIRD1xx – [External Model] under [Circuit Call]

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IBIS 5.0 Pending Changes

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  1. IBIS 5.0Pending Changes • IBIS 5.0 has several BIRDs already “queued” • BIRD74.6 – EMI Parameters • BIRD95.6 – Power Integrity Analysis using IBIS • BIRD97.2/98– Gate Modulation Effect • BIRD103.1– [Model Spec] DDR2 Over/Undershoot • BIRD1xx – [External Model] under [Circuit Call] • BIRD1xx– ICM-IBIS Linking • BIRD1xx – User-Defined Measurements IBIS Futures Task Group

  2. IBIS 5.0 Direction • IBIS 5.0 is “a fork in the road” • With each revision, we add keywords, subparameters • Features from previous versions unchanged • Clarifications excepted • IBIS 5.0 becoming highly encumbered • 101 keywords in IBIS 4.2 • New features have to avoid stepping on old ones • Example: ICM-IBIS link nearly impossible due to paths blocked by old requirements, assumptions IBIS Futures Task Group

  3. Proposed Actions “Splitting” IBIS 5.0 into sub-specifications • New compatibility switch • If switch is in “non-compatible” mode, rules regarding previous versions are simplified • “Compatible” mode keeps 4.2 rules & features plus enhancements we selectively add Old features can be maintained as they are phased out New keyword, feature development need not be hampered by previous version limitations IBIS Futures Task Group

  4. Non-Compatible Mode • New mode eliminates keywords • Package, TTgnd, TTpower • Voltage Range, Driver Schedule, Submodel • PKG, EBD, Diff Pin, Pin Mapping, etc. • Simplify features using multi-lingual structure • [Pin] no longer assumes 1:1 link to [Model] • Can add [Pad] keyword for buffer pad nodes • Support arbitrary power, package paths • Support direct link to ICM • Parser enforces differences IBIS Futures Task Group

  5. Pros and Cons • Pros • Focuses IBIS on value-add in multi-lingual world • Makes connections intuitive again • Removes obstacles to advanced development • Cons • Two-parsers-in-one required • Dual-meaning of keywords depending on context • e.g., [Pin] will have different rules for both modes • Some “retooling” of passed BIRDs required IBIS Futures Task Group

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