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Therefore my question is if I can use 1.3V as Vccio for the FPGA.
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You'll need to file a Service Request with Altera's official support channel to get an official answer to this.
If you have a development board where you can control the VCCIO of a bank, eg., the DE115, then try using VCCIO = 1.3V and see what happens. I can't think of any reason it would not work. You could then try lying to Quartus that VCCIO is 1.2V and then 1.5V and see if any difference is observed.
The data sheet can't have a guarantee for a continuous range of voltages, so it likely just contains the 'standard' voltages.
The alternative is to use an officially supported voltage on VCCIO and use an external dual-supply-rail device. Texas Instruments has several. You'd just need to find a TI device with a 1.3V specification.
Cheers,
Dave
Honored Contributor
