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qwitza's avatar
qwitza
Icon for Occasional Contributor rankOccasional Contributor
3 years ago

Calculate skew timing with Cyclone V and ksz9031

hello, i have troubles with the ethernet bandwith and retransmissions (ack). after some diagnostic i think it is an timing issue. the wire length from the fpga -> knz9031 is: mil ...
Nurina's avatar
Nurina
Icon for Regular Contributor rankRegular Contributor
3 years ago

Also, just to confirm- you have already adjusted the skew setting on the PHY and you have found the best result from there?

So now you want a method to calculate the best skew timing for confirmation? How did you know the adjustment gave the best result in the first place?


  • qwitza's avatar
    qwitza
    Icon for Occasional Contributor rankOccasional Contributor
    3 years ago

    Hello,

    in the first run, we just try different values and measured the data rate.

    afte we ve more concerned with the topic, we found the information about calculating the delay.

    and now we are not sure how we get the values.

    i think with all the information from the first post, it should be possible to get the best delay settings.

    but the fpga need some special settings

    https://www.intel.com/content/www/us/en/support/programmable/articles/000079123.html

    thanks