Unused IO Banks

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If im not using any pins on a IO Bank do i need to connect up its IO VCC? or can i leave this bank completely un powered?

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Which device are you using?

FPGAs have a power-on-reset that will not release until the power rails are all within tolerance.

I'm not sure what flexibility there is in not having some VCCIO banks power up.

If you read the handbook and cannot quite figure it out, you could always start removing power from VCCIO banks on a development board and see if the FPGA still works. Eg., the Terasic DE-115 has VCCIO jumpers on some of its banks, while other boards have resistors between their main power rails and the VCCIO banks.

Cheers,

Dave