An Efficient On-line-Test and Back-up Scheme for Embedded Processors

  • Authors:
  • M. Pflanz;F. Pompsch;H. T. Vierhaus

  • Affiliations:
  • -;-;-

  • Venue:
  • ITC '99 Proceedings of the 1999 IEEE International Test Conference
  • Year:
  • 1999

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Abstract

Self test strategies for processors in embedded core-basedsystems have recently found great attention fortwo reasons. First, production test for embedded coresis becoming a problem due to inaccessible processorpins. Second, self test is a very desirable feature forprocessors in applications that require a high level ofdependability over a long life time. Standard processorsor processor-cores used in embedded systems are notaccessible for a full-scale redesign. Therefore methodsmust be developed that facilitate self-test by keeping theoriginal cores as unharmed as possible. The approachpresented here duplicates only the truly necessary partsof a standard processors for test and back-up purposesincluding capabilities of on-line self test. Transientfaults are recognized and compensated. In a secondstep, the back-up processor itself becomes fully self-testingand fault tolerant towards a highly dependablesystem solution by state-encoding of control paths andBerger code check in the data path.