Pattern synchronizing circuit

H - Electricity – 04 – B

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H04B 17/00 (2006.01) H04J 3/06 (2006.01) H04L 7/04 (2006.01)

Patent

CA 2043803

ABSTRACT OF THE DISCLOSURE An Nth one of N parallel sequences of low-speed data demultiplexed by a demultiplexer from high speed input data in synchronization with a high-speed clock is compared by N comparators with N parallel sequences of reference patterns. The N parallel sequences of reference patterns are each generated in synchronization with a frequency divided clock obtained by frequency dividing the high-speed clock into 1/N. When any of the comparators provides a disagreement output at least once, one clock pulse is eliminated by a post-clock eliminating circuit from the divided clock so that the N sequences of reference patterns are each delayed by one bit. When it is detected by a counter that any one of the comparators does not provide the disagreement signal for n consecutive bits, the sequence of reference pattern corresponding to this comparator and the Nth sequence of low-speed data are in synchronization with each other. Clock pulses of the number corresponding to the line position of the synchronized sequence of reference pattern are eliminated by a pre-clock eliminating circuit from the high-speed clock which is applied to the demultiplexer. By this, line positions of the N parallel sequences of low-speed data are sequentially shifted so that the Nth sequence of low-speed data assumes the same line position as that of the synchronized reference pattern, and as a result, the N parallel sequences of low-speed data are synchronized with the N parallel sequences of reference patterns, respectively.

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