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Library Compiler supports CCS models

Posted: 01 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:model accuracy verification? Library Compiler CCS? characterization engine?

Seeking to drive wider adoption of its Composite Current Source (CCS) models, Synopsys Inc. updated Library Compiler, a library modeling tool used by virtually every Synopsys user. The company also rolled out Liberty NCX, a new library characterization toolset based on CCS.

Library Compiler takes the open-source Liberty library format and compiles it into binaries for Synopsys tools. Enhancements include quality assurance and model adaptation capabilities aimed at CCS. "Since any company that touches IC design today has access to Library Compiler, we feel this will really put current-source models within the reach of every design team," said Robert Hoogenstryd, director of marketing for the implementation group at Synopsys.

Liberty NCX is a new library characterization solution that replaces NanoChar, Synopsys' previous characterization tool, which the company picked up when it acquired Avanti Corp. Unlike NanoChar, Liberty NCX is built from the ground up to support CCS. In addition to the Library Compiler's capabilities, Liberty NCX includes simultaneous characterization and model accuracy verification.

Current source models increase accuracy by using current waveforms instead of delay and slew values in the library. There are, however, two competing current source formatsSynopsys' CCS and the Effective Current Source Model (ECSM) supported by rivals Cadence Design Systems and Magma Design Automation. Hoogenstryd noted that Library Compiler can generate ECSMs from CCS models, as well as the nonlinear delay models that preceded current source models.

Extended capabilities
After Synopsys introduced CCS two years ago, Hoogenstryd said, the company released an open-source parser, a syntax checker, a library quality assurance checker and a set of reference scripts for third-party tool providers. With the new release of Library Compiler, Synopsys is seeking to bring many of those same capabilities to its customers, he said.

Liberty NCX is aimed at internal library development groups in foundries, IDMs and intellectual property providers. It includes a model characterization engine, a suite of library quality checkers, and compaction and model translation functions.

While NanoChar had a "bolt-on" solution to support CCS, Liberty NCX offers native support for CCS library generation, Hoogenstryd said. He also said Synopsys has re-architected the NanoChar user interface to make the product easier to use. Liberty NCX offers more efficient use of CPU resources and a more efficient characterization approach, according to Hoogenstryd.

Liberty NCX generates timing, noise and power models. Synopsys claims that a typical 600-cell, 90nm library was generated in 33 CPU hours, and an 800-cell, 65nm library was generated in 50 CPU hours.

- Richard Goering
EE Times

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