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Cyclone 3 provides several settings for VCCIO for each of the IO banks.
The VCCIO that you should use should be the VCCIO as implemented on your FPGA board for that bank and this depends on the I/O standard that you use to communicate with the peripherals connected to the IOs of that bank.
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sanmao:thanks so much for your help.And for your words ,sound like that if one piece FPGA chip (cyclone 3)work with more than two kinds of level of chip with different bank connected to respectively ,so we should set different VCCIO to the banks that connected ? actually ,i am confused that we set the VCCIO value for the IOs standard through QUARTUSII ,that is nothing with the hardware circuit of the FPGA chip,why there is that kind of settings in the software? To say the least ,if we connect the different bank with different voltage (I mean the VCCIO don't care the VCCINT here)for the IOs ,the FPGA chip would work?just hope for understanding more ,thank you
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