FX3 : unused GPIO and 22Ohms resistor for UART and SPI ? | Cypress Semiconductor
FX3 : unused GPIO and 22Ohms resistor for UART and SPI ?
I got two questions about the FX3 GPIOs.
What should I do with unused GPIO pins in my design ? Should I leave it floating ?
My second question is about the 22Ohms resistor. In the datasheet it is said that a 22Ohm should be connected to any pin driven by the GPIFII interface. I thought that any other pin should not be connected to that resistor but I saw in the Superspeed explorer kit schematics that a 22Ohm resistor is also connected to the UART and SPI pins. What should I do ?