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Ralf Jurrien : January 24th 2007 - 23:07 CET

Synopsys DFT MAX scan compression


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OkiSynopsys DFT MAX scan compression : Synopsys, a leader in semiconductor design software, announced that Oki Electric Industry Co., Ltd. has adopted the Synopsys DFT MAX scan compression automation solution to enable higher test quality for its digital designs. DFT MAX implements compression on-chip that results in significantly less data required for each test pattern. Using DFT MAX, Oki was able to apply comprehensive at-speed testing in addition to its regular tests to improve the quality of volume testing without having to increase the memory capacity of its testers. Using DFT MAX requires no expertise in test compression techniques. Its gates-only adaptive scan architecture is the most area-efficient solution available.
Synopsys DFT MAX scan compressionSynopsys scan compression
"Oki needed a solution to further improve the product quality of our complex systems-on-chips (SoCs), but do so in a cost-effective manner that would allow us to utilize our existing automatic test equipment," said Jiro Kobayashi, senior manager of Oki's Telecom & Automotive System business division in Silicon Solutions Company. "DFT MAX substantially reduced the amount of data needed for our at-speed tests, using a very low area overhead and requiring very little additional design effort to incorporate into our existing DFT flows. For these reasons, Oki has adopted DFT MAX for our future SoC designs."

DFT MAX - Control clock sequencing
Very high quality testing can be achieved by applying tests at a chip's operating frequency. But if different circuits operate at different frequencies, it can be a difficult and time-consuming task to design and verify custom logic to control the complex clock sequencing. This was the challenge faced by designers of a several-million-gate Oki communications SoC containing circuits driven by a large number of internal and external clocks operating at different frequencies. Rather than develop a custom clock controller from scratch and risk delaying the project schedule, Oki designers instead used DFT MAX to fully synthesize the clock controller circuits and integrate them into the design. This automated approach saved a significant amount of engineering time and effort, and made it possible to tapeout the design on time. Synopsys' TetraMAX DSMTest automatic test pattern generation (ATPG) solution was later used to generate high-coverage transition delay patterns which were applied successfully on the tester to validate the fabricated device.

Oki Synopsys - DFT solutions
"As designs have grown larger and more challenging to test, semiconductor companies such as Oki are turning to Synopsys for the most innovative DFT solutions," said Graham Etchells, director of Test Marketing, Synopsys Implementation Group. "DFT MAX helps these companies achieve their quality goals with minimal impact on design time and silicon cost. And because migration to DFT MAX can be accomplished in days instead of months, our customers quickly see tangible benefits from applying more defect-based tests - transition delay, bridging, IDDQ, and now small delay defect tests -to achieve even higher test quality and higher diagnostics accuracy."

Synopsys Galaxy Design Platform
Using DFT MAX requires no expertise in test compression techniques. Its gates-only adaptive scan architecture is the most area-efficient solution available. By avoiding the use of complex sequential state machines for compression/decompression, the adaptive scan architecture disperses test logic throughout the design, alleviating wire-routing congestion and reducing silicon area overhead cost. Working seamlessly within Synopsys' Galaxy Design Platform, DFT MAX produces predictable results with little to no impact on timing.

About Synopsys
Synopsys, Inc. is a world leader in electronic design automation (EDA) software for semiconductor design. The company delivers technology-leading semiconductor design and verification platforms and IC manufacturing software products to the global electronics market, enabling the development and production of complex systems-on-chips (SoCs). Synopsys also provides intellectual property and design services to simplify the design process and accelerate time-to-market for its customers. Synopsys is headquartered in Mountain View, California, and has more than 60 offices located throughout North America, Europe, Japan and Asia.





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