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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

Hello,


Can you provide some updates?

I cannot get any confirmation with internal team on the best skew calculation.

But the normal practice is to start with measuring a working window, get the min and max skews then use the midpoint and fine tune it as you wish. I think you have done this already.


If it is working on the hardware then it should be fine.


Regards,

Nurina


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

hello,

but how about the wire length?

sould be the resistor considered?

how would be the "best" timing for our board?

thanks