I don't have ability to check good link with partner because its debug stage and I need to see that CDR locked on data first. I want to make Serial loopback" and checking CDR locked on data .
Yes I enabled the NPDME. without enabling the NPDME I open "Ethernet link inspector - Link Monitor" and I see with loopback the link detected, all clocks are detected and PLL locked. when I running the Link Monitor with partner (Snow Ridge) if I enable and disable loopback the monitor stop working.
The error "Couldn't grab .." appears also in 100G IP, and 25G IP when select more then one lane. in 40G IP its works good .
this happened on Quartus Pro 19.2 and 19.3