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imx8m-mini pcie_ref_clk direction

Question asked by Michel Counson on May 10, 2019
Latest reply on May 13, 2019 by Wigros Sun

Component concerned: IMX8M Mini


It is not clear if the PCIe reference clock (ball pin A21 & B21) are able to receive or generate a PCIe clock.


On the NXP evaluation module schematics a bidir port have been used for these pins, so we can suppose both possibilities exists.


But, if both possibilities exist, what is the register used to select the input or output mode for the PCIe reference clock.


Moreover, I have not found in the datasheet the full specification of these pins (for input and/or for output mode).


If output mode is available, external pull down resistor needed, external serial resistor needed, drive capabilities?


Thank you for your help