2.1.1 Power-Up/Down Sequence

All Axcelerator I/Os are tristated during power-up until normal device operating conditions are reached, when I/Os enter user mode. VCCDA should be powered up before (or coincidentally with) VCCA and VCCI to ensure the behavior of user I/Os at system start-up. Conversely, VCCDA should be powered down after (or coincidentally with) VCCA and VCCI. The VCCI and VCCA can be powered up in any sequence with respect to each other, provided the requirement with respect to VCCDA is satisfied.