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scenario for PO&POE on ARM Artiasn GPIO ?

Hi, everyone:

    We are using the Arm Artisan GPIO library. The library says:

PO-parametric output, parametric inverted data for pad to core logic.

POE-parametric output enable,logic-LOW forces PO high,logic-HIGH enables parametric inverted Y at PO.

Anyone who kowns the application scenario for PO&POE ,please tell me.

Thank you very much!