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Additional parameters for signaling spreadsheet
(1) Input referred device noise
(2) Input referred offset
(3) Input referred environmental noise
(4) Reference level sampling error
(5) Reference level generation error
(6) Ensuring that eye-width is measured at the 1/2 eye height point.
(7) Listing of all tap values after adaptation
(4) and (5) are specific imperfections that result from multi-level
signaling. To set a multi-level threshold, a circuit needs to measure
something (4) and a circuit needs to use the measurement to generate
the threshold (5). Both of these will have errors.
(6) is also a multi-level issue. Multi-level eyes are symmetric in
voltage and time but not simultaneously. The widest eye-width is not
at the center of the eye-height. We need to ensure the results are
not the result of taking the best of both.
Thanks,
Xilinx, Communications Technology Division
805 Las Cimas Pkwy #250
Austin, TX 78746
brian.brunn@xilinx.com
512-634-1304