--- Quote Start ---
I think it's possible to use 3.3V as well, but if you intend to, best check here in this forum first.
--- Quote End ---
For singe ended IO, CIII supports 3.3V, but its IO output buffer strength is limited to a low current 4ma drive. At 2.5&3.0V LVTTL CIII can use higher current strength settings which gives more options for higher speed IO.
Also, while the configuration programming is done, the CIII VCCIO supply for the programming pins ideally would match the IO voltage of the configuration device which can be an issue if you had planned to use the IO bank at a different IO voltage.
Also besides the the data book which has recommended hookups for the various config modes, I also found the pin out/pin list (u can downloaded off altera web site) to be good in a quick sort of way of explaining what the the programming pins are and how to decouple the PLL power pins.
Honored Contributor
