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Brian Brunn <Brian.Brunn@XILINX.COM>
Sent by: owner-stds-802-3-blade@listserv.ieee.org 11/30/2004 10:49 AM
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To: STDS-802-3-BLADE@listserv.ieee.org cc: Subject: [BP] Parameter input to 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,
Brian T. Brunn
Xilinx, Communications Technology Division
805 Las Cimas Pkwy #250
Austin, TX 78746
brian.brunn@xilinx.com
512-634-1304