Electrical computers and digital processing systems: support – Synchronization of clock or timing signals – data – or pulses
Reexamination Certificate
2003-08-08
2008-03-04
Butler, Dennis M. (Department: 2115)
Electrical computers and digital processing systems: support
Synchronization of clock or timing signals, data, or pulses
C713S503000
Reexamination Certificate
active
07340630
ABSTRACT:
A multiprocessor computer system comprises multiple data processors, each with an internal clock for providing time stamps to application software. The processors take turns as synchronization masters. The present master transmits a “request” time stamp (indicating the time of transmission according to the local clock) to the other (“slave”) processors. Each slave processor responds by returning a “response” time stamp (indicating the time of transmission of the response according to the local slave clock) of its own along with the received request time stamp. The master calculates clock adjustment values from the time of receipt of the responses and the included time stamps. This allows asynchronous clocks to be synchronized so that application time stamps can be validly compared across processors.
REFERENCES:
patent: 4531185 (1985-07-01), Halpern et al.
patent: 5327468 (1994-07-01), Edblad
patent: 5408506 (1995-04-01), Mincher et al.
patent: 5530846 (1996-06-01), Strong
patent: 5715438 (1998-02-01), Silha
patent: 6023769 (2000-02-01), Gonzalez
patent: 6236623 (2001-05-01), Read et al.
patent: 6351821 (2002-02-01), Voth
patent: 6502141 (2002-12-01), Rawson
patent: 6591370 (2003-07-01), Lovett et al.
patent: 7058838 (2006-06-01), Xu
patent: 2002/0019951 (2002-02-01), Kubo
patent: 2002/0031196 (2002-03-01), Muller et al.
patent: 2002/0129290 (2002-09-01), Couillard
patent: 2003/0033551 (2003-02-01), Kuhn
patent: 2003/0103486 (2003-06-01), Salt et al.
patent: 2005/0210306 (2005-09-01), Rich et al.
Mills, David L., “Precision Synchronization of Computer Network Clocks”, 1994, pp. 1-16, available from the Internet at http://citeseer.ist.psu.edu/mills94precision.html.
Rangarajan, Sampath, and Satish K. Tripathi, “Efficient Synchonization of Clocks in a Distributed System”, Proceedings, Twelfth Real-Time Systems Symposium, IEEE, 1991, pp. 22-31.
Tilak, Raghukul, and Alan D. George, and Robert W. Todd, “Layered Interactive Convergence for Distributed Clock Synchronization”, Microprocessors and Microsystems 26 (2002), pp. 407-420.
Morris Dale C.
Ross Jonathan K.
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