Honored Contributor
Honored ContributorHi Scott,
Thanks for your example design! Do you happen to have some measurement data on your 12G links? I have some test eye-pattern scans in this PDF ... http://www.ovro.caltech.edu/~dwh/correlator/pdf/hawkins_jpl_2014.pdf p25 has a picture of the ADC board I am worked on (with 10Gbps outputs), pp36 to 42 has transceiver link tests. These results were not optimized, i.e., no transmitter pre-emphasis or receiver equalization. I wanted to start with a "reference" data set. I'm in the process of writing my own eye-pattern sweep, since I wanted to be able to control the logic behind the eye-pattern generation. I'm interested in hearing if you have a custom designed board, and what it took to get your links working nicely at 12Gbps. I plan on designing a Stratix V or Arria V GZ with as many QSFP+ connectors as I can, so I'm interested in understanding where others have succeeded :) Cheers, Dave
