Automatic clock frequency acquisition

Details Automatic clock frequency acquisition Automatic clock frequency acquisition

2010-04-06

2011-11-15

Tran, Khanh C (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C331S011000

Reexamination Certificate

active

08059778

ABSTRACT:
A system and method are provided for automatically acquiring a serial data stream clock. The method receives a serial data stream with an unknown clock frequency and coarsely determines the clock frequency. The frequency is coarsely determined by (initially) selecting a high frequency first reference clock (Fref1), and counting the number of data transitions in a first time segment of the serial data stream at a plurality of sample frequencies equal to Fref1
, where n is an integer ≧1. The count for each sampling frequency is compared to the count for Fref1 (n=1). Next, the highest sampling frequency (n=x) is determined, which has a lower count than Fref1, and the coarse clock frequency is set to Fc1=Fref1/(x−1).

REFERENCES:
patent: 6292065 (2001-09-01), Friedman et al.
patent: 7102446 (2006-09-01), Lee et al.
patent: 7720189 (2010-05-01), Do et al.
patent: 2008/0095291 (2008-04-01), Cafaro et al.

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