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W7500 DUP pin MII interface

Hi,

I searched description of this pin (DUP) in datasheet and reference manual, but I found nothing. From example schematic I found that this should be a pin for detection full-duplex/halp-duplex link state. It is so?

I like connect KSZ8863MLL with W7500, but don’t have a pin on this IC which would have this functionality. What happens if this pin (DUP) stays unconnected?

Thanks!

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