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Clock Failure Detector Circuit With Clock Signal Returned to Clock Generating Circuit Card From Remote Card for Comparison With Original Clock Circuit

IP.com Disclosure Number: IPCOM000062009D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Brown, DR: AUTHOR [+2]

Abstract

A processor has two or more circuit cards that all operate with clock signals that are derived from a common oscillator, as is conventional. A first circuit card carries the oscillator and circuits that form the clock signal. This clock signal is supplied to several components on the first card. These components repower the clock circuit for use by the component. of these components also repowers the clock signal and sends it to a second circuit card. On the second card the clock signal is repowered by each component on the card and one of these components also repowers the clock signal so that it can be sen another card.

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Clock Failure Detector Circuit With Clock Signal Returned to Clock Generating Circuit Card From Remote Card for Comparison With Original Clock Circuit

A processor has two or more circuit cards that all operate with clock signals that are derived from a common oscillator, as is conventional. A first circuit card carries the oscillator and circuits that form the clock signal. This clock signal is supplied to several components on the first card. These components repower the clock circuit for use by the component. of these components also repowers the clock signal and sends it to a second circuit card. On the second card the clock signal is repowered by each component on the card and one of these components also repowers the clock signal so that it can be sen another card. The clock signal from the second card is returned to the first card, and circuits on the first card compare the returned clock signal with the original clock signal, allowing for any expected phase shifts in the two clock signals. If the clock signals do not compare equal, components on the first card signal a clock failure interrupt.

Disclosed anonymously.

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