GPIO Max input voltage?

The gpio pins of the Rock pi x model b development board support maximum how many volt inputs. Where can I find the related datasheet.

The RK3399 datasheet can be found here:

Thank you for the information. but I guess this chip is not used in the rock pi x model b development card.

check the intel TRM manual about the atom x5-z8350,

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Oh, Iā€™m sorry, I misread your post. My apologies.

Thank you again for your interest and reply.

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