Voltage GPIO DE1/DE2?

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The DB9 serial port on some of the DE series boards are connected to a driver chip that can handle 5 volts easily. Alex was referring to the pins on the FPGA itself. You can easily damage an FPGA with too high a voltage.

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Thanks you!

1. But UART were designed by me. it just recieve singal from GPIO, i can assign signal RX to DB9 serial on DE?

2. If on wire RX signal use schematic 5v -> 3.3v and provide to GPIO, it true? it look like image.

http://www.alteraforum.com/forum/attachment.php?attachmentid=11527&stc=1