VCCAUX_IO, VCCAUX_HDIO, VCCAUX_HPIO, and VCCAUX_XP5IO - VCCAUX_IO, VCCAUX_HDIO, VCCAUX_HPIO, and VCCAUX_XP5IO - UG861

In the I/O banks, V_{CCAUX_IO} is also used to power input buffer circuits for some of the I/O standards. These include some of the single-ended I/O standards at or below 1.8V, and also some of the 2.5V standards (HD I/O banks only). Additionally, the V_CCAUX rail provides power to the differential input buffer circuits used for most of the differential and V_REF I/O standards. Each SelectIObank type has dedicated package pins for the bank type on the device: V_{CCAUX_HDIO}, V_{CCAUX_HPIO}, or V_{CCAUX_XP5IO}. Within a device all V_{CCAUX_IO} of the same bank type must be shared. For example, if a device has multiple V_{CCAUX_HPIO}, they must share the same source. When V_CCAUX operates at the same voltage as V_{CCAUX_IO}, the supplies can be shared.

The power supply requirements, including power-on and power-off sequencing, are described in the Spartan UltraScale+ FPGA Data Sheet: DC and AC Switching Characteristics (DS930) .