Method and apparatus for signaling on-line failure detection

Details Method and apparatus for signaling on-line failure detection Method and apparatus for signaling on-line failure detection

1983-04-11

1985-09-03

Fleming, Michael R.

Excavating

371 29, G06F 1100

Patent

active

045396825

ABSTRACT:
Method and apparatus permitting a multi-module digital system, such as a puter, having built-in test hardware associated with each module, including a plurality of signal processing units to communicate over two wire circuitry not only the existence of a failure of a particular module, but also its causality. This is accomplished by means of a four state signaling circuit interposed between each signal processing unit of a particular module and a module built-in test circuit which operates once an error output is reported by a signal processing unit to provide a further four state indication of the details of the failure.

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