Systems and arrangements for clock and data recovery in...

Details Systems and arrangements for clock and data recovery in... Systems and arrangements for clock and data recovery in...

2011-03-29

2011-03-29

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Synchronizers

Synchronization failure prevention

C375S260000, C375S359000, C375S371000, C375S375000, C375S376000, C370S503000, C370S509000

Reexamination Certificate

active

07916820

ABSTRACT:
A dual mode clock and data recovery (CDR) system is disclosed. A fast locking, oversampling CDR acquisition module can begin the process to quickly create a data acquisition clock signal in start up data acquisition conditions. When at least some data can be extracted from the incoming data stream, the CDR system can indicate such stability and switch to accept control from a low power CDR maintenance module. The low power CDR maintenance module can then fine tune and maintain the timing of the data acquisition signal. If the quality of the data lock under CDR maintenance module control degrades to a sufficient degree, the high power CDR acquisition module can be re-enables and re-assert control from the low power module until such time as the lock quality is again sufficient for the low power module to be used.

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