IBIS FUTURES COMMITTEE MULTILINGUAL MODEL DIGITAL …

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  • 1.IBIS FUTURES COMMITTEEMULTILINGUAL MODEL:[Circuit Call] REFERENCES John Angulo 8th April 2004
  • 2.ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential 2 [External Circuit] Other than D_drive/D_enable/D_receive, ports have no predefined meaning or connection [Circuit Call] instantiates and connects them [External Model] All ports have predefined meanings and connections per IBIS version 4.0 [Pin] keyword instantiates and connects them Assumptions [External Circuit] will model any buffer technology old IBIS can’t handle Old IBIS structure is inflexible, so limit [External Model] to an upgrade path BIRD 75.8 Assumptions
  • 3.ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential 3 [External Circuit] can’t quite model a buffer No timing test load… no flight time compensation No measurement thresholds… no flight time, overshoot, hysteresis measurements [External Circuit] can’t talk to a buffer model We can only connect an [External Circuit] to other [External Circuit]s Use [External Circuit] for the interconnect… can’t use [Model] or [External Model] for the buffer Multilingual approach is limited in practice to package/interconnect or the buffer, not both [External Circuit] behavioral parameters for buffer modeling are still pending BIRD 75.8 Limitations
  • 4.ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential 4 Let [Circuit Call] reference [Model] No syntax changes necessary Available ports are already enumerated in BIRD 75.8 Could use advanced package or die interconnect model together with multilingual buffer model, or old IBIS model No conflicts between old IBIS and nodal connections We already handle incomplete port mappings by defaulting to internal values, as seen in HSPICE We already let the user choose between internal values and external port mappings, as in HSPICE power={on|off} Practical Solution
  • 5.ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential 5