Interfacing Xilinx Virtex-5 FPGA with CYUSB003 kit

Hi,

I am designing  a custom board using Xilinx Virtex-5  FPGA and CYUSB003 kit as a piggyback module. I want both the Virtex-5 board and the superspeed kit to be powered up simultaneously. What are my options?What if  Virtex-5 board gets powered up first  and superspeed kit gets power after a while or vice-versa. Will it cause damage to the board?