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Fleeting Error Detection on a 5-Phase Clock Generator

IP.com Disclosure Number: IPCOM000039352D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Orengo, G [+details]

Abstract

The detection of a fleeting disfunction of a 5-phase generator is provided. The generator consists of a ring counter generating the 5 phases. That operation normally involves a loop of 10 codes among the 32 possible codes. The remaining 22 codes are normally never involved and their fleeting occurrence, due to interference, may bring about a misfunction or a breakdown of the whole system. The device includes means for detection of one of the 22 unauthorized codes and means for getting back the ring counter to the normal and authorized loop. The ring counter may be a Johnson counter made up of 5 edge-triggered D- type flip-flops. A 5-bit binary counter has 32 possible codes, and a 5-bit Johnson counter uses only 10 out of the 32 possible codes.