Input/output Buffer Information Specification

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Secure specification for IC interface

title: "Input/output Buffer Information Specification" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["electronic-design-automation"] description: "Secure specification for IC interface" topic_path: "general/electronic-design-automation" source: "https://en.wikipedia.org/wiki/Input/output_Buffer_Information_Specification" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Secure specification for IC interface ::

Input/output Buffer Information Specification (IBIS) is a specification of a method for integrated circuit vendors to provide information about the input/output buffers of their product to their prospective customers without revealing the intellectual property of their implementation and without requiring proprietary encryption keys.{{cite web | url = http://www.ibis.org/faq/#_1 | title = IBIS Open Forum: Frequently Asked Questions: What is this IBIS stuff anyhow?

Traditional IBIS models are generally used instead of SPICE models to perform various board level signal integrity (SI) simulations and timing analyses. IBIS models could be used to verify signal integrity requirements, especially for high-speed products.

IBIS-AMI models run in a special-purpose SerDes channel simulator, not in a SPICE-like simulator, and consist of two text files (*.ibs and .ami) plus a platform-specific machine code executable file (.dll on Windows, *.so on Linux). IBIS-AMI support statistical and so-called time-domain channel simulations, and three types of IC model ("impulse-only," "GetWave-only," and "dual mode")

History

Intel initiated IBIS in the early 1990s.{{cite web | author = Mark Chang | title = Introduction to IBIS Modeling of Fiber Optic Transceivers | version = | publisher = Agilent Technologies | date = | url = http://cp.literature.agilent.com/litweb/pdf/5990-3107EN.pdf | accessdate = December 23, 2010 | journal = | archive-url = https://web.archive.org/web/20110707094747/http://cp.literature.agilent.com/litweb/pdf/5990-3107EN.pdf | archive-date = July 7, 2011 | url-status = dead

As IBIS evolved with the participation of more companies and industry members, an IBIS Open Forum was created to promote the application of IBIS as a simulation tool format and to make sure that a standard exists. Many semiconductor vendors supply IBIS models{{cite web | url = http://www.ibis.org/models/ | title = IBIS Model Suppliers | url = http://www.ibis.org/roster/ | title = 2011 ANSI/EIA-656B IBIS Committee Participation Roster | url = http://www.ibis.org/specs/ | title = IBIS Open Forum - Specifications | url = http://www.ibis.org/touchstone_ver2.0/touchstone_ver2_0.pdf | title = Touchstone® File Format Specification Version 2.0

Version 5.1 was ratified on August 24, 2012. Important changes included the so-called "flow BIRD" which resolved many ambiguities in the IBIS AMI flow.

The IBIS Open Forum became an official subcommittee of TechAmerica in January 2009.{{cite web | url = http://www.ibis.org/faq/#_18 | title = IBIS Open Forum: Frequently Asked Questions: How do I become an IBIS Forum Member? |url=http://www.sae.org/servlets/pressRoom?OBJECT_TYPE=PressReleases&PAGE=showRelease&RELEASE_ID=2175 |title=SAE International Completes Asset Purchase of TechAmerica Standards Program |date=July 18, 2013 |accessdate=July 20, 2013

Evolution

IBIS is an evolving standard with many proposed changes submitted to IBIS Open Forum for consideration.{{cite web | url = http://www.ibis.org/birds/ | title = Buffer Issue Resolution Documents (BIRD)

Version 6.0 was ratified on September 20, 2013. Changes included an IBIS‐AMI extension for mid-channel repeaters, new parameters for jitter and noise in IBIS-AMI, and analog buffer modeling improvements.

Version 6.1 was ratified on September 11, 2015. Changes included support of PAM-4 in IBIS-AMI, the addition of a new Initial Delay keyword, and additional options for overclocking.

Version 7.0 was ratified on March 15, 2019. Changes included support for Touchstone and IBI-ISS (SPICE) modeling of interconnections, and modeling of back-channel link training protocols using IBIS-AMI models.

Work on enhancing the specification can be tracked in the work-in-progress section of the IBIS Open Forum website.

Notes

References

  1. "Index of /ver5.1".
  2. "BIRD 120.1 IBIS-AMI Flow Correction".
  3. "Chair's Annual Report July 28, 2009, slide 3, Michael Mirmak".
  4. "SAE Industry Technologies Consortia: Industry Programs".
  5. "Index of /ver6.0".
  6. "Index of /ver6.1".
  7. "IBIS Version 7.1".
  8. "IBIS Task Groups".

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