Method and apparatus for detecting selected absence of digital l

Details Method and apparatus for detecting selected absence of digital l Method and apparatus for detecting selected absence of digital l

1987-01-16

1991-05-28

Lee, Thomas C.

Boots, shoes, and leggings

364270, 364271, 3642713, 364950, 3649503, 364947, 3649472, 364234, 3642341, 3642314, 364231, 371 671, G06F 104, G06F 112

Patent

active

050200240

ABSTRACT:
Digital logic equipment in which two logic elements operate with timing control from a clock element with selected synchronism, includes a failure detecting element which detects the absence of the selected synchronism between the two logic elements even when each is providing otherwise correct logic operation. The apparatus and method enable a digital logic system to follow two redundant digital logic elements so long as they operate in lock step synchronism, and to sense a failure which occurs only in synchronism to disable one of the two logic elements to maintain thereafter uninterrupted operation with the other logic element.

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