IBIS FUTURES COMMITTEE MULTILINGUAL MODEL: [Circuit Call] REFERENCES John Angulo 8 th April 2004

ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential 2 n [External Circuit] — Other than D_drive/D_enable/D_receive, ports have no predefined meaning or connection — [Circuit Call] instantiates and connects them n [External Model] — All ports have predefined meanings and connections per IBIS version 4.0 — [Pin] keyword instantiates and connects them n 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

ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential 3 n [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 n [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 n [External Circuit] behavioral parameters for buffer modeling are still pending BIRD 75.8 Limitations

ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential 4 n 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 n 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

ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential 5