CASP: concurrent autonomous chip self-test using stored test patterns

  • Authors:
  • Yanjing Li;Samy Makar;Subhasish Mitra

  • Affiliations:
  • Stanford University;CSwitch Corporation;Stanford University

  • Venue:
  • Proceedings of the conference on Design, automation and test in Europe
  • Year:
  • 2008

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Abstract

CASP, Concurrent Autonomous chip self-test using Stored test Patterns, is a special kind of self-test where a system tests itself concurrently during normal operation without any downtime visible to the end-user. CASP consists of two ideas: 1. Storage of very thorough test patterns in non-volatile memory; and, 2. Architectural and system-level support for autonomous testing of one or more cores in a multi-core system using stored patterns, concurrently with normal system operation, without bringing down the entire system. CASP enables design of robust systems with built-in features for circuit failure prediction, error detection, self-diagnosis and self-repair. Such systems are necessary to overcome major reliability challenges in scaled-CMOS technologies. Implementation of CASP in the OpenSPARC T1 multi-core processor demonstrates its effectiveness and practicality.