Two high density headers, HDRXU and HDRYU, on the upper side of the board, route signal and power interconnects to support upward expansion:
HDRYU routes signal and power interconnects to the expansion board.
HDRXL routes high-speed buses to the expansion board.
You must implement these buses yourself. FPGA bus widths.
The Versatile Express PCIe connector daughterboard, V2C-002, is an example of a board that can be used for upward expansion. the DVD supplied with the V2F-1XV7 daughterboard for mechanical information.