imic discussion bob ross interconnectix business unit mentor graphics corporation ibis summit...

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?