Method and system for resynchronizing a phase-shifted received d

Details Method and system for resynchronizing a phase-shifted received d Method and system for resynchronizing a phase-shifted received d

1996-04-19

1997-11-25

Butler, Dennis M.

Pulse or digital communications

Repeaters

Testing

395558, 395559, 375355, 375371, 375375, G06F 104

Patent

active

056921667

ABSTRACT:
A method and system in a data processing system for resynchronizing a received data stream with a master clock having a master clock frequency, wherein the received data stream is clocked with a received data clock that is out of phase with the master clock by an arbitrary number of degrees. The master clock and the received data clock are compared at a frequency of a resynchronization clock for a predetermined number of times to produce comparison results. The resynchronization clock frequency may be less than the frequency of the master clock. The comparison results are analyzed to produce a relative phase indicator. In response to the relative phase indicator exceeding, or being less than, a phase shift threshold, the received data stream is reclocked at a rising or falling edge of the master clock to produce a resynchronized data stream, wherein the resynchronized data stream is synchronized with the master clock and contains the data of the received data stream.

REFERENCES:
patent: 4633487 (1986-12-01), Goeb et al.
patent: 4756011 (1988-07-01), Cordell
patent: 5278873 (1994-01-01), Lowrey et al.
patent: 5428648 (1995-06-01), Fukuda
patent: 5539784 (1996-07-01), Brauns et al.

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