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whether it is a problem to connect the VCCIO pins of the MAX II device to a non-standard voltage, lets say for example 2.75v
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Obviously the MAX II specification is based on discrete I/O voltages, but you can't find a reason in the datasheet, why any value between 1.5 and 3.3 V shouldn't work as well.
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but you must take care about the voltage levels VioH and VioL so choose the correct io behavioral (VTLL VCMOS ....)
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Although you can specify I/O-standards for MAX II pins in the Quartus software, nothing is actually changed in configuration bitstream. Only current strength and activation of S/T input are real hardware features, the rest is for calculation of nominal current strength and checking of suitable bank voltage assignments.
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