Concurrent Error Detection Using Watchdog Processors

Istvan Majzik
Department of Measurement and Instrument Engineering
Technical University of Budapest
Budapest, Hungary
http://www.mit.bme.hu/~majzik/wp/conerr/

Ideal checks

Acceptable checks

Error detection

Error detection is based on some form of redundancy: Error detection:

Faults

Concurrent, on-line detectors of transient errors:

Watchdog processors

They monitor the behavior of the main processors. initially, WP is given reference information about the main processor. At run-time, it compares it with the information received form the main processor.