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In this overview of diagnosis of scan logic and diagnosis driven failure analysis, the authors explore the world of diagnosis of digital semiconductors devices. After shortly outlining the technology behind diagnosis, the main part of this article describes key improvements to the basic diagnosis tools, discussing their merits for the failure analysis engineer. The article also describes the various requirements and other considerations that typically need to be taken into account to set up a full working scan diagnosis system. It summarizes the principles of design with embedded compression technologies. Finally, several successful industrial applications of diagnosis are presented.

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