Pulse or digital communications – Synchronizers – Synchronization failure prevention
Reexamination Certificate
2003-09-04
2009-10-27
Vo, Don N (Department: 2611)
Pulse or digital communications
Synchronizers
Synchronization failure prevention
C375S376000
Reexamination Certificate
active
07609797
ABSTRACT:
A communication system, clock recovery circuit, and method are provided for allowing data to be transmitted across a communication system and between clock recovery circuits absent a clock master specifically designed for one node of the communication system. Absent a clock master, the communication system is permitted to enter into an all slave mode, with periodic unlock conditions possibly rotating about the communication system ring topology. However, the unlock condition can be readily detected and if the received data bitstream formed into a recovered clock exceeds a threshold above or is less than a threshold below a reference clock generated during instances of unlock, then the clock recovery circuit will fix the synchronizing clock to the reference clock, and cause the bitstream to resynchronize to the reference clock before the reference clock is again disabled to allow the communication system to re-enter the all slave and rotating unlock condition. Periodic application of a reference clock interspersed with periodic application of a clock having transitions equal to the incoming bitstream proves advantageous in avoiding a design where a dedicated master must be used within a specified communication system node.
REFERENCES:
patent: 4782483 (1988-11-01), Lambert et al.
patent: 5245637 (1993-09-01), Gersbach et al.
patent: 5525935 (1996-06-01), Joo et al.
patent: 5535337 (1996-07-01), Hogan et al.
patent: 5652758 (1997-07-01), Donley
patent: 5914991 (1999-06-01), Gigandet et al.
patent: 6112072 (2000-08-01), Stiegler et al.
patent: 6121816 (2000-09-01), Tonks et al.
patent: 6147825 (2000-11-01), Alini et al.
patent: 6308298 (2001-10-01), Blatchley et al.
patent: 6404825 (2002-06-01), Efstathiou
patent: 6438178 (2002-08-01), Lysdal et al.
patent: 6754171 (2004-06-01), Bernier et al.
patent: 6792005 (2004-09-01), Antosik et al.
patent: 6831523 (2004-12-01), Pastorello et al.
patent: 6990159 (2006-01-01), Balb et al.
patent: 2002/0041215 (2002-04-01), Kiyose
patent: 2002/0051510 (2002-05-01), Noguchi
patent: WO 01/06666 (2001-01-01), None
European Search Report, Application No. 04020230.1, mailed May 8, 2006.
Knapp David J.
Lewis Jason E.
Daffer Kevin L.
Daffer McDaniel LLP
Standard Microsystems Corporation
Vo Don N
LandOfFree
Circuit, system, and method for preventing a communication... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit, system, and method for preventing a communication..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit, system, and method for preventing a communication... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4080851