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IEEE board approves OCV extensions to Liberty

Posted: 02 Oct 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Synopsys? Liberty? timing closure? on-chip variation? LTAB?

Synopsys Inc. has completed an initiative to bring together and standardise on-chip variation (OCV) extensions to the open-source Liberty library format, the existing modelling standard for IC implementation and signoff. Recent extensions that complete the unified OCV feature set were ratified on August 1, 2014 by the Liberty Technical Advisory Board (LTAB), an IEEE-ISTO federation member program representing the broad semiconductor design ecosystem.

The recent variation technology is immediately supported by Synopsys' design platform ecosystem composed of SiliconSmart library characterisation, IC Compiler place and route, Library Compiler library checker and compiler, and PrimeTime ADV signoff timing and noise analysis solutions.

LTAB members collaborated to consolidate various modelling formats such as advanced on-chip variation (AOCV), parametric on-chip variation (POCV) and statistical on-chip variation (SOCV) into a single, unified open-source standard for industry-wide use, known as the Liberty Variation Format (LVF) extensions. Unanimously approved by the LTAB board, the latest LVF additions include extensions for slew-load dependent transition and constraint sigma variation tables. These extensions provide designers with a modelling technique that may further reduce timing margins for advanced process nodes such as FinFET, boosting timing closure turnaround-time. This achievement represents the culmination of a phased approach in collaboration with industry leaders to ensure broad ecosystem enablement from foundry data and model availability, library characterisation and modelling know-how, EDA tool chain support and ROI impact assessment. The board also welcomed some new members including Samsung.

"The completion of a unified standard format for OCV modelling in Liberty is a major milestone for the LTAB," said Jim Sproch, LTAB chair and senior director of engineering at Synopsys. "However, it is not just about a format; it is about technology enablement and collaboration across the industry. Recently ratified Liberty Variation Format extensions complete the unification of AOCV, POCV and SOCV into a single, universally adopted industry standard, and form a common platform for future development."

"It was important to have a single standard to enable the semiconductor design ecosystem," said Marco Migliaro, president at IEEE-ISTO. "LVF extensions to Liberty are a great example of LTAB partnership, where engaged industry leaders come together every six months for active discussion and quickly converge so we can all be ready for the technology ramp. We are excited to have new members join LTAB and provide their valuable insights to the ecosystem."

The Liberty Technical Advisory Board ratified the latest LVF extensions to Liberty on August 1, 2014. Liberty documentation will be updated in the next regularly scheduled revision in late 2014.

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