Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1998-01-09
2000-08-15
Chin, Stephen
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375362, 375365, 375366, 375367, 370512, 370513, 370514, H04L 700, H04J 306
Patent
active
061047708
ABSTRACT:
There is provided an apparatus for detecting a synchronizing signal, including a first circuit for extracting bit clocks from serial data received, a shift register for shifting the serial data bit by bit on the basis of the bit clocks, and latching the thus shifted serial data, a second circuit for counting the bit clocks, and generating word clocks in accordance with the number of count of the bit clocks for outputting parallel data, a third circuit for detecting a synchronization pattern from the serial data stored in the shift register, and generating a first synchronization-detecting signal, a fourth circuit for detecting a synchronization pattern from the parallel data, and generating a second synchronization-detecting signal, and a fifth circuit for determining whether frame synchronization is made, by the first and second synchronization-detecting signals, and generating a frame synchronization indication signal indicative of whether frame synchronization is made or not. The third and fourth circuits are switched in accordance with the frame synchronization indication signal. Even if a wrong synchronization pattern appears in serial data during data is transferred, the above-mentioned apparatus makes it possible to avoid wrong synchronization by judging whether frame synchronization is made or not, and switching the third and fourth circuits in accordance with the judgement.
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patent: 5862143 (1999-01-01), Suh
Chin Stephen
NEC Corporation
Rupert Paul N.
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