Reference clock recovery for “eye” measurements

Details Reference clock recovery for “eye” measurements Reference clock recovery for “eye” measurements

2005-09-15

2009-11-24

Phan, M. (Department: 2419)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C370S395430, C370S360000, C702S069000

Reexamination Certificate

active

07623581

ABSTRACT:
A method for recovering a clock from a serial data stream for use in producing “eye” diagram measurements includes determining an initial recovered clock from the serial data stream based upon transition edges. Time interval error values are then determined as a function of the transition edges and corresponding initial recovered clock times. Time interval error values are interpolated for initial recovered clock times not associated with transition edges to produce a complete set of time interval error values. The complete set of time interval error values are lowpass filtered to produce a filtered set of time interval error values. The clock for the serial data stream is reconstructed from the filtered set of time interval error values.

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T.10 Specification Guide for SAS, T10/1601-D Revision 9d, Working Draft for Serial Attached SCSI—1.1 (SAS-1.1), Section 5.3.5.3 “Receiver device eye mask”, published by American National Standards Institute, (ANSI), May 30, 2005, Copyright 2005.

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