| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and device to draw eye diagrams of multi-valued signals that remove non-data dependent effects. SOLUTION: The method includes collecting event counts at variable bit offsets, desired time offsets within one or more bit periods and within a voltage region of interest; removing non-data dependent effects from the 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. The device includes a window comparator operative to generate an output signal having a first value if the input signal is within a desired voltage region; a sampling device operative to sample the output signal; an event array counter representing the number of sampled inputs within one or more desired time offsets and the desired voltage regions; and a trigger processing circuit operative to generate a bit offset signal that controls the counting. COPYRIGHT: (C)2007,JPO&INPIT
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