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SiSoft and IBIS

SiSoft is an active member of the IBIS Open Forum and is strongly committed to the development of open modeling standards.  We helped found the IBIS Quality committee in 2002 and are currently helping drive development and adoption of the IBIS-ATM standard for Serial Link Device Modeling.  Our products rely on IBIS models to link system level interconnect to their respective signal integrity models package and buffer models.  Quantum-SI extends the IBIS standard, allowing IBIS models to reference transistor level buffer models and detailed SPICE package models.


IBIS Advanced Technology Modeling Task Group

The IBIS Advanced Technology Modeling (IBIS-ATM) task group focuses on defining modeling standards for emerging device technologies.  Since early 2006, this Committee has been focusing on serial link transmitters and receivers, defining standards for modeling equalization and clock recovery behavior.  This group has developed a proposed standard that will allow SerDes IP models to operate in different EDA tools and allow models from different SerDes IP vendors to be mixed in the same simulation, while simultaneously protecting SerDes vendor IP.

A draft version of the proposal was approved by the task group on June 26, 2007 for prototype model and EDA tool development.  SiSoft (and others) developed working models and simulator code, then demonstrated the ability to run different models in different simulators (interoperability).  Improvements and clarifications were incorporated into the formal draft of the proposal, due to be submitted to the IBIS Open Forum in October 2007.

Material presented by SiSoft on IBIS-ATM

More information on this effort can be found on the IBIS-ATM Website.

SerDes Simulation Toolkit

IBIS Algorithmic Modeling Interface (AMI) models provide a standard mechanism for modeling transmit / receive equalization and clock recovery algorithms for SerDes devices. The IBIS-AMI specification allows a serial channel to be "characterized" using circuit simulation techniques; that channel characterization is then combined with signal processing techniques and IBIS-AMI models to predict the link's behavior over millions of bits of data. IBIS-AMI models represent equalization and clock recovery algorithms using executable code - the use of a "black box" technique permits fast modeling of device behavior and also helps protect semiconductor vendor IP.

This free toolkit contains a sample IBIS-AMI 4-tap transmitter model in both binary and executable form along with the IBIS_AMI_test utility. IBIS_AMI_Test allows IBIS-AMI models to be run as standalone executables from the O/S command line. This toolkit also includes sample data and batch jobs - everything you need to demonstrate the speed and flexibility these models have to offer.

Download the SiSoft IBIS-AMI toolkit (Version 2.10)


IBIS-Quality

The IBIS Quality Committee was originally established by SiSoft and other IBIS users frustrated with the current state of publicly available IBIS models. The Committee is striving to develop a thorough checklist to facilitate a standardized way of communicating between IBIS model developers and end-users. The committee is also working to establish a baseline quality level for IBIS models. The checklist and quality standard would ultimately be incorporated into purchasing specifications.  This committee is currently chaired by Mike LaBonte of Cisco Systems.

IBIS Quality Website

 
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