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The I/O voltage setting has the purpose of informing Quartus about the hardware enviroment. The actual voltage is set by connecting the VCCIO pins to a respective supply. Apparently your board (I guess, a development kit) has all or most VCCIO pins wired to 3.3V.
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Does the IO voltage setting have purpose other than informing quartus?
eg, if I want to use max-ii device as level shifter, but one side of the shifter's voltage is variable, you know...
so I hope the IO voltage setting has only information purpose. then i can chose one setting and change VCCIO without re-compile
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