IMIC DISCUSSION

Bob Ross

Interconnectix Business Unit

Mentor Graphics Corporation

IBIS Summit Meeting, San Diego, CA

December 7, 1998

IBIS Status Update

JEDEC/IBIS Meeting» New Requirements& Needs» IMIC (I/O Interface Model for Integrated Circuits)

IBIS Version 3.2» Delay, Expected January 15, 1998 Ratification Vote» BIRD57 (for Bus Hold/Active Termination Extension)

– Consideration on December 18, 1998

– ibischk3.2 parser change

DesignCon99 IBIS Summit February 1, 1999» Accuracy Issues, Future Features, Booth

Why Consider IMIC?

Started 1996 to Enhance IBIS Version 2.1 by EIAJ I/O Project Modeling Group

Targeted to Future Needs, Protect Process, Expand to New Device Architectures

Mixture of IBIS and SPICE IBIS/EIAJ Meetings/Presentations 2/97, 6/97, 1/98,

6/98, 10/98 London IEC Meeting - Why IBIS & IMIC? POSSIBLE SOLUTIONS TO IBIS LIMITATIONS

Brief IMIC Overview EIAJ Slides From Older Presentations (separate

package)» Standard: http://tsc.eiaj.or.jp/tsc/SSC/iopg.htm

EIAJ Overview» Level 1: Signal Integrity» Level 2: Power Integrity» Level 3: Future EMI

Scope» Module (IBIS EBD)» IC (IBIS Component & Models)» Package (IBIS Package)

Brief IMIC Overview Cont’d Missing Information for Digital Simulators

» Model Type (must derive from other information)» Specs for Thresholds, Overshoots, Timing, etc.» Some Connection Information (explicit differential pins,

ground/power relations, etc.) IMIC: IBIS, SPICE & Table SPICE

» Buffer Models - Table SPICE Construction» Package/Module Models SPICE & .SUBCKT Calls» IBIS Style Shell» SPICE PWL Stimulus» TYP, SLOW, FAST Packages, Buffers, Stimulus

IBIS/IMIC Options Merge

» Complicates Well Accepted IBIS» Unacceptable Sacrifices in IBIS of IMIC» Actual Dual Support by EDA Vendors

Link» Leverage IBIS Specification & Acceptance & IMIC

Package, Buffer Details» IBIS “Submodel” & Package Extension?

Be Independent» Translator Path: IMIC to IBIS

Linkage Discussions

Package Model Linkage» IMIC Spice - Provides Format Convention

– Supports FAST, SLOW, TYP Packages

» Standard Spice Table Spice For Buffers

» Buffers by Construction for New Features– May Be Proprietary– May Be Complicated - Behavioral Approach in IBIS

Extensions May Still Be Adequate

» Single Complete Model by Construction & Scaling» Accuracy Details

Discussion

Study Group Participants» Stephen Peters, Raj Raghuram, Norio Matsui, Bob Ross» Others Welcome

Issues» Complexity» Support (IC & EDA Vendors)» Simulation Speed» Accuracy» Logistics» Incompatibilities?