Fault Injection into VHDL Models: Experimental Validation of a Fault-Tolerant Microcomputer System

  • D. Gil
  • R. Martínez
  • J. V. Busquets
  • J. C. Baraza
  • P. J. Gil
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1667)


This work presents a campaign of fault injection to validate the dependability of a fault tolerant microcomputer system. The system is duplex with cold stand-by sparing, parity detection and a watchdog timer. The faults have been injected on a chip-level VHDL model, using an injection tool designed with this purpose. We have carried out a set of injection experiments (with 3000 injections each), injecting transient and permanent faults of types stuck-at, open-line and indetermination on both the signals and variables of the system, running a workload. We have analysed the pathology of the propagated errors, measured their latency, and calculated both detection and recovery coverage. We have also studied the influence with the fault duration and fault distribution. For instance, system detection coverage (including non-effective faults) is 98% and the system recovery coverage is 95% for short transient faults (0.1 clock cycles).


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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • D. Gil
    • 1
  • R. Martínez
    • 2
  • J. V. Busquets
    • 1
  • J. C. Baraza
    • 1
  • P. J. Gil
    • 1
  1. 1.Grupo de Sistemas Tolerantes a Fallos (GSTF) Departamento de Informática de Sistemas, y Computadores (DISCA)Universidad Politécnica de ValenciaSpain
  2. 2.Instituto de Robótica Universitat de ValènciaPaterna, ValenciaSpain

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