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Programmed Clock Synchronization in a Skewed Clock Environment

IP.com Disclosure Number: IPCOM000041360D
Original Publication Date: 1984-Jan-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Stranko, TA Swann, RL [+details]

Abstract

A service processor must be able to exercise strict control over the entire computing system including starting, stopping, and restarting after stoppage due to a hardware detected failure. A variety of basic clocks is required to handle long and short data path requirements. Stopping these clocks synchronously at the time of a hardware failure, or to perform some system function, is imperative in the preservation of the state of the system or functional unit of the system. Once stopped, the system can be scanned for diagnostic analysis and, after a required system function is performed, the system can be restarted without loss of integrity. System stoppage is performed by the service hardware which, upon receipt of a particular signal from a functional unit, turns on a sync latch/trigger combination.