SynTest Receives a Patent for Debug, Diagnosis, and Yield Improvement of ICs using Test Compression or Logic BIST

¡°Debug, diagnosis, and yield improvement of scan-based integrated circuits¡±

SAN JOSE, Calif., June 8, 2006 -- SynTest Technologies, Inc., a leading supplier of
Design-for-Test (DFT) tools, was granted 34 claims on June 6, 2006 under United States
Patent number 7,058,869 for its invention of debug, diagnosis, and yield improvement of
a scan-based integrated circuit where scan chains are surrounded by pattern generators
and response compactors when using a DFT (design-for-test) technology, such as Test
Compression or Logic BIST (built-in self-test).

The invention includes an output-mask controller and an output-mask network to allow
designers to mask off pre-selected scan cells from being compacted in a specific response
compactor. It also includes an input chain-mask controller and an input-mask network for
driving constant logic values into scan chain inputs of selected scan chains to allow
designers to recover from scan chain hold time violations. Methods are then proposed to
automatically synthesize the output-mask controller, output-mask network, input chainmask
controller and input-mask network, and to further generate test patterns according
to the synthesized scan-based integrated circuit. The patented DFD (design-fordebug/
diagnosis) inventions are used in SynTest products VirtualScan for ATPG pattern
compression and TurboBIST-Logic for self-test, resulting in improved yield, productivity
and time-to-market (TTM). The patented inventions also aid in improved debug and
diagnosis of Scan-based integrated circuits.

About SynTest

SynTest Technologies, Inc., established in 1990, develops IP for advanced design-for-test (DFT) and design-for-debug/diagnosis (DFD) applications and markets them throughout the world, to semiconductor companies, system houses and design service providers. The company has filed more than 20 US/PCT patents of which 3 have been issued and 2 allowed. The Company¡¯s products improve an electronic design¡¯s quality and reduce overall design and test costs. Various applications that use these IP (intellectual properties) include logic BIST, memory BIST, boundary-scan synthesis, Scan/ATPG with test compression, concurrent fault simulation, silicon debug and diagnosis. The company headquartered in Sunnyvale, California, has offices in Taiwan, Japan, Korea and China, and distributors in Europe and Asia including Israel. More information is available at

SynTest Technologies Inc. is headquartered at 505 South Pastoria Ave., Suite 101, Sunnyvale, California 94086, Phone: 408-720-9956, E-Mail:

SynTest and TurboBIST-Logic are trademarks of SynTest Technologies, Inc. All other trademarks are property of their respective owners.

ATPG: Automatic Test Program Generation
BIST: Built-In Self-Test
DFT: Design-for-Test
DFD: Design-for-Debug/Diagnosis
IP: Intellectual Property
TTM: Time-to-Market

For more information:
SynTest contact info: Ravi Apte
Tel:1- 408-720-9956 ext. 300