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Isolating and Retaining Bus Information on Extension Units Disclosure Number: IPCOM000060778D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09

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Christiansen, RA Treu, AR [+details]


This article describes a technique for retaining fault information on extension units due to power faults or power interruptions by using one repowering controller to monitor the status of the other repowering controller. When a bus is extended outside the power domain, if the outside domain has a power failure, detection and isolation abilities to that other power domain are lost. The technique disclosed herein provides for logic in two power boundaries, so that information and interrupts generated will not be lost when power is lost in the slave power boundary. Logic in the local power boundary will have the fault information. The concept is illustrated in the block diagram of the drawing.