This article covers the UltraScale External DONE pull-up recommendation.
DONE is a dedicated bidirectional pin referenced to VCCO_0.
A High signal on the DONE pin indicates completion of the configuration sequence.
By default, the DONE output is open-drain.
Xilinx recommends an external 4.7k Ohm pull-up from the DONE pin to VCCO_0.
When the DONE pin is otherwise not connected, the UltraScale device configuration DONE pin does not require an external pull-up resistor.
Although the FPGA DONE output is open-drain, the DONE I/O includes an internal pull-up and internal pipeline register to assure reliable configuration startup.
There is no setup or hold requirement for the DONE register.