PYNQ-Z1 board I/O pins switching speed

Hi, I am trying to use the PYNQ-Z1 to read the digital outputs from an external ADC. I am also trying to generate the sampling clock for the ADC from the PYNQ-Z1 board itself. Therefore I want to know what is the maximum switching speed of the I/O pins if I want to output a 3.3V clock signal from the I/O pins?

P.S. I have read the PYNQ-Z1 board reference manual but the documentation doesn’t mention anything about it. It is only mentioned that the Pmod port in this board is the high-speed type, but the documentation doesn’t tell you exactly the maximum speed.

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