03-13-2018 09:30 AM
In Vivado, it is the xdc file for constraints (UCF was used with ISE, which is no longer used with devices in 7 series and newer),
Constraints are device, design, printed circuit board, specific, There is no set of constraints for a given device (part-package).
There are board files for various boards available, which may serve as a source for your design. For example for the Virtex-7 XC7VX485T-2FFG1761C:
I see no readily available boards for the XC7K480T-2FFG901I device....
03-20-2018 08:18 AM
UCF is not supported in Vivado, only XDC is.
There is a Migration Guide UG911 which is available to ease the changeover: