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Synopsys, Si2 to form Liberty modeling standard board

Posted: 15 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Dylan McGrath? Synopsys? Si2? Silicon Integration Initiative? Liberty library modeling?

Highlighting what they say has been tremendous adoption of the open source Liberty library modeling standard over the past 10 months, Synopsys Inc. and the Silicon Integration Initiative (Si2) plan to form a technical advisory board (TAB) to facilitate the evolution of the standard, the two companies said last week.

The TAB will consist of approximately 12 members, elected for three-year terms. Membership will include representatives from EDA vendors, end users, foundries and intellectual property providers, the organizations said. Requests for enhancements can come from the membership as well as the overall Liberty user base.

Board members have not yet been chosen. Solicitations have been sent out, according to Robert Hoogenstryd, director of product marketing for Synopsys' implementation group, and a board member announcement is expected in "weeks rather than months."

Liberty includes a current-source model, considered a replacement for the nonlinear delay models used with the ".lib" library format. Those table-lookup models capture single data points for timing and represent drivers as voltage sources. A current-source model, by contrast, contains a current waveform that more closely matches the Spice behavior of a cell. At 90nm and below, technologists say, current-source models are needed to bring more accuracy to delay calculation.

Synopsys claims that Liberty is the de-facto standard in library modeling, with support from more than 60 EDA vendors with more than 750 libraries in production. Liberty is said to enable accurate and comprehensive modeling of nanometer effects, including timing, noise, power and test.

For Si2, which is involved in facilitating a number of standardization and collaborative development efforts, the formation of a technical advisory board is an unusual, but not unprecedented step, according to Steve Schultz, the organization's president and CEO. Shultz pointed to Si2's creation of a governing board in 2001 for the LEF/DEF open source community as an example of a precedent.

"Liberty has been very popular, and, consequently, many challenges are coming across the industry supply chain concurrently," Schultz said. "We really have an urgent need to work together. I can think of no better approach to bring together everyone in the supply chain to be able to communicate in real time the changes and enhancements necessary and avoid creating sequential bottlenecks."

- Dylan McGrath
EE Times

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