New Contributor
New ContributorHi Dlim,
Thank you for the help so far. It seems like BER of 1.5E-2 is some sort of upper limit.
As for my custom hardware, I think the reason it was giving me BER of always 1.5E-2 was an hardware issue. I found that a differential pair was swapped positive and negative, which the third party IP which implements the protocol automatically handles polarity swap. However, their IP did not have an ADME option to enable the transceiver toolkit so I was using the Cyclone 10 reference design which can't handle polarity swap. After I implement a workaround, I see a much lower BER, and sweeping the settings changes BER.
However, the color indicator behavior is still a bit confusing to me. When I disconnect the loopback, the indicator will sometimes still remain green, even though there is no physical path from TX to RX, even though BER will become 1.5E-2. When I was testing earlier with the swapped polarity and BER stuck at 1.5E-2, the indicator was green with a loopback connected. I see that your screenshot, you also have the indicator green with 1.5E-2 BER. I think it might have something to do with the options in Transceiver Native PHY IP under Standard PCS tab"Number of word alignment patterns to achieve sync", "number of invalid data words to lose sync, "number of valid data words to decrement sync". I haven't figured out how to change these yet without getting an error
Best regards
Chenxi
