11-20-2019 12:51 AM
I have ported a design from XCKU040 to a compatible XCKU060. Both with package FFVA1156.
I am not using GTH banks 127 and 128 of XCKU060 (they don`t exist in XCKU040), so I have connected MGTAVCC_L, MGTAVTT_L and MGTVCCAUX_L of XCKU060 to GND.
Some high-speed links are not linking in IBERT (only 5 banks used for it), but if I switch on internal loop-back then it is ok.
Is it possible that GND connection to MGTAVCC_L, MGTAVTT_L and MGTVCCAUX_L is reponsible for this behaviour ?
Thank you for any hint.
11-21-2019 03:13 PM
No if mgtavcc were grounded where it was needed the affected GT wouldn't work at all. There is some other problem on this. Can you test with IBERTS in the 1 Gbps range to help determine if it is a signal integrity problem.