Phase coherence specifications for the x440 are only published for the X4_400 and X4_1600 images, not the X4_200 image that contains DUC/DDC blocks. I also saw in the documentation for the x440 that "Timed tuning is not supported (to be accurate, timed tuning of the RFSoC NCO is not supported)". From working with x310s with twinrx daughtercards in the past, I know timed tuning was required for phase coherent operation. Does the fact that the x440 does not support timed tuning mean that phase coherence is not possible when using DUC/DDC blocks in the X4_200 image?
