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Altera_Forum
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11 years ago

DE1-SoC - Change GPIO Output Voltage

Hi! Just wanted to make sure I got this right: I am using the DE1-SoC (Cyclone V FPGA). There is no way to change the output Voltage of the GPIO-Pins internally (in Quartus or by jumpers...
Altera_Forum's avatar
Altera_Forum
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11 years ago

Double check the mainboard to make sure the I/O routed to that connector has the bank I/O on the same rail that is supplied to the card. If you are not sure which bank each of the I/O is on you can look it up in the device pinouts or look them up in the Quartus pin planner. It doesn't matter which voltage is routed to the card if the FPGA I/O bank is on an incompatible bank voltage.

Also keep in mind that you don't always have to use the same bank I/O voltage as the items connected on the other side. That link in my first post shows the I/O capabilities and it's quite common to mix and match voltages as long the FPGA and the other device are compatible with the voltage combination.