Honored ContributorHello! I have a question, everybody help me. How much is the voltage input/output GPIO DE1/DE2? And if i assign high signal (5v), low (0v) from power supply to GPIO, Kit DE1/DE2 have get signal with value is 5v (Logic 1) and 0v (Logic 0). Thanks
Honored ContributorThe voltage of GPIO will depend on the IO standard that you set to it. You can double check the expected voltage levels from datasheet of the device.
Honored Contributor5V is too much for both DE1 & DE2 kits - it'll work for a short while before you damage it.
3.3V maximum. Cheers, AlexHonored ContributorThank for reply my question! But i'm doing a project transmit audio with UART, recieve singal from UART is 5v (Logic 1), if i use variable resistors to convert 5v -> 3.3v, it may wrong?
Honored ContributorThe 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.
Honored ContributorHonored ContributorYou might need to add another chip to step down from 5V to 3.3V to work with the FPGA.
Honored ContributorYour circuit, to drop your 5V signal to 3.3V, should work just fine.
Cheers, Alex
