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IBM Enterprise System/9000 clock system: A technology and system perspective

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3 Author(s)
Chiu, K. ; IBM Technology Products, East Fishkill facility, Route 52, Hopewell Junction, New York 12533, USA ; DeFazio, J.J. ; McNamara, T.G.

The minimization of system clock skew is critical to the overall performance of high-speed computer systems. This paper discusses the statistical clock skew calculation methodology employed in the analysis of the IBM Enterprise System/9000™ (ES/9000™) computer systems. Comparisons made to a worst-case design approach show the advantages of a statistical clock skew calculation and its use in the timing analysis of ES/9000 systems. Design techniques that aid in the minimization of system clock skew are discussed throughout this paper. While many details concerning these design techniques and the statistical clock skew calculation methodology are tutorial in nature and have been used in the design of past IBM high-end machines, it is hoped that this paper will give the reader a useful understanding of the major considerations affecting the clock system and its application to an ES/9000 system.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:36 ,  Issue: 5 )