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DP83822I: TX_ER SIGNAL MII

Part Number: DP83822I

Hi,

I have to use the DP83822 connected to a microcontroller with MII interface.
The Ethernet connection will be IEE802.3 10BASE-Te and 100BASE-TX.
Should the TX_ER signal be connected?
What are the problems that can occur by not connecting it?

I have read about it, but I don't understand when the TX_ER signal is used or can be omitted.
Could you give me some advice /explanation?

Thanlks

Robert