Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1993-12-16
1995-06-27
Chin, Stephen
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
370102, 370108, H04L 700, H04L 2536, H04L 2540
Patent
active
054286492
ABSTRACT:
An elastic buffer utilizes a circular buffer for receiving successive symbols over a communications link. The transmission clock of the received symbols and internal clock of the node on which the elastic buffer is located are independent. The transmission clock is used to load the successive symbols received over the transmission link into the circular buffer. The internal clock controls reading of the successive symbols from the circular buffer. A phase comparator operating on the transmission and internal clocks periodically generates an input side skip signal when the transmission clock overtakes the phase of the internal clock and an output side skip signal when the internal clock overtakes the phase of the external clock. An idle symbol detector monitors the successive symbols generates an idle indication when an idle symbol occurs. Responsive to concurrence of an input side skip signal and an idle indication, loading of an idle symbol from successive symbols into the circular buffer is omitted. Responsive to occurrence of an output side skip signal, the reading of successive symbols from the circular buffer is delayed for an internal clock period.
REFERENCES:
patent: 4429386 (1984-01-01), Graden
patent: 4764942 (1988-08-01), Shigaki et al.
patent: 4839893 (1989-06-01), Smith
patent: 4849969 (1989-07-01), Annamalai
patent: 4849970 (1989-07-01), McCool
patent: 4885758 (1989-12-01), Speckenbach
patent: 4920547 (1990-04-01), Murakami et al.
patent: 4945548 (1990-07-01), Iannarone et al.
patent: 4965794 (1990-10-01), Smith
patent: 5142529 (1992-08-01), Parruck et al.
patent: 5146477 (1992-09-01), Cantoni et al.
patent: 5311511 (1994-05-01), Reilly et al.
patent: 5323426 (1994-06-01), James et al.
"IEEE Standard for Scalable Coherent Interface (SCI)", Institute of Electrical and Electronics Engineers, Inc., IEEE Std. 1596-1992, New York, N.Y., Aug. 2, 1993, pp. 1-83.
Anglin J. Michael
Chin Stephen
Dillon Andrew J.
Hargrove Keith L.
International Business Machines - Corporation
LandOfFree
Elastic buffer with bidirectional phase detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Elastic buffer with bidirectional phase detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elastic buffer with bidirectional phase detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-293030