Looking at the Rev B04 schematics for the XEM8320, the fabric_refclk_c nets, found on page 3, seem to not be connected anywhere in the schematic. They are supposed to connect to T24/U24 on bank 65 but this is omitted from the schematics.
The doc portal for this board shows the following:
|CLOCK||FREQUENCY||FPGA PINS (P / N)|
|Fabric||100 MHz||T24 / U24 (Bank 65)|
|DDR4||100 MHz||AD20 / AE20 (Bank 64)|
|MGT||125 MHz||P7 / P6 (Bank 226)|
Is there an updated schematic that I can reference or am I missing something there?