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US 4,059,749 AGranted
Digital monitor
AssigneeWestinghouse Electric Corp.
InventorMichal M. Feilchenfeld
Life of this patent
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Abstract
A monitor for checking a plurality of multi-bit digital patterns generated by a system being monitored to determine that each pattern is valid, that each of the patterns appear in the right sequence and that the total number of valid patterns detected during the testing cycle is as expected is disclosed. Additionally, the bit patterns are monitored to detect unexpected transitions. The results of these tests are then combined to form a composite malfunction signal indicative of the operational status of the system being monitored.
Claims5
Apparatus for determining the operational status of a digital system comprising:
- a. first means for receiving as an input digital signals, each of said signals including a plurality of bits having a predictable bit pattern indicative of the operational status of said digital system, and for generating in response thereto a pattern fault signal for each of said digital signals having an unexpected bit pattern;
- b. second means for receiving as an input said digital signals and for in response thereto generating an error signal for each pattern found to be in an unexpected sequence;
- and
- c. third means for combining said pattern fault and said error signals to generate a composite status signal indicative of the operation status of said digital system.
1 more element
Dependencies are inferred from the claim text.