Double-clicking an FPGA brings up the following options under the Advanced heading:
Build options for Xilinx provides a large number of options that control the way in which bitstreams for this processor are constructed. Refer to the Xilinx documentation for details.
The Attachment area is discussed in a previous topic.
Clock domains allows you to create new clocks on the processor. You can find further information under Clock domains.
Extra options provides a string that is added to the end of the PROCESSOR statement generated for this processor in the configuration file. This allows you to specify any options that are not managed by the IDE.
The Boot area allows you to specify a file that is used to load the processor. Tasks cannot be placed on a processor that uses the boot option. There are more details under BOOT attribute.