Browse Prior Art Database

Reliable Clocking

IP.com Disclosure Number: IPCOM000107411D
Original Publication Date: 1992-Feb-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Aichelmann Jr, FJ: AUTHOR

Abstract

A clocking structure is proposed which provides an uninterrupted stream of clock pulses as long as one of the copies of the redundant clocks operates in a timing interval.

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This is the abbreviated version, containing approximately 100% of the total text.

Reliable Clocking

       A clocking structure is proposed which provides an
uninterrupted stream of clock pulses as long as one of the copies of
the redundant clocks operates in a timing interval.

      With conventional clocking, a clocking failure of either
transistor or interruption can bring the operation down.  This
proposal utilizes a 2-copy redundant clocking structure which can
produce a clocking fault tolerance in an individual path.

      Fig. 1 shows this reliable clocking structure network. This
network uses two copies of the clock with each individual path using
the copies for either data or a clear to the "D"-type latches.  These
latches utilize the preset and clear control functions as the
detector by not clocking the "AND gates" when a clock interruption
occurs in an individual path.  This enables the "OR gate" to maintain
an uninterrupted clocking interval. This operation is depicted by
example in Fig. 2.  An uninterrupted stream of clocks is maintained
as long as one of the copies operates within a timing interval.