In BPI Mode, the RS pins need to be wired to upper address bits with a pull-up resistor on at least one of the RS pins tied to an upper address line. The other RS pin could be pulled up or down depending on the bitstream size, flash size, and where you would like the power-up bistream to be located in the flash. With this hardware implementation, the system is exclusive of the WBSTAR address, and the bitstream options are the same for each image. Refer to RS Pins for further details.