Method and apparatus to measure and display data dependent...

Details Method and apparatus to measure and display data dependent... Method and apparatus to measure and display data dependent...

2005-01-24

2008-12-16

Chung, Phung M (Department: 2117)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error count or rate

Reexamination Certificate

active

07467336

ABSTRACT:
A method and apparatus to draw eye diagrams of multi-valued signals that remove non-data dependent effects is disclosed. An exemplary method includes collecting event counts at variable bit offsets, desired time offsets within one or more bit periods and desired voltage offsets within a voltage region of interest; removing non-data dependent effects from the collected event counts; generating a composite diagram of the desired time offsets within the one or more bit periods of interest and desired voltage offsets within the voltage region of interest; and displaying the composite diagram. An exemplary apparatus includes a windowed comparator operative to receive an input signal and generate an output signal having a first value if the input signal is within a desired voltage region; a sampling device, coupled to the windowed comparator, operative to sample the output signal and generate a logical signal at desired time intervals; an event array counter, coupled to the sampling device, operative to generate a count value signal representing the number of sampled inputs within one or more desired time offsets and the desired voltage regions; and a trigger processing circuit, coupled to the event array counter, operative to generate a bit offset signal that controls the counting of the event array counter in response to a test pattern signal.

REFERENCES:
patent: 5124849 (1992-06-01), Chur
patent: 6715112 (2004-03-01), Jungerman
patent: 6728311 (2004-04-01), Waschura et al.
patent: 7310389 (2007-12-01), Waschura et al.
patent: 2003/0177438 (2003-09-01), Waschura et al.

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