Regarding the voltage of the control signal of PCIE, the descriptions in the design guide and pin mux documentation are inconsistent

Both are correct. The pins are 1.8V level but 3.3V tolerance.

if the pins are 1.8V level,why use the 3.3V Isolator,and the description about those pins is pull up to 3.3V internally

Because the pins are 3.3v tolerance and 3.3v is for PCIe spec.

got it,thanks

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