ETH_nINT on STM32H7x3I-EVAL function

MFawzy · ‎2025-09-17

I was reviewing the schematic for the STM32H7x3I-EVAL board and noticed that the ETH_nINT pin from the Ethernet PHY is connected to pin PG7 of the microcontroller.

I'm having trouble finding clear documentation on how this pin functions. Could someone please clarify the following?

What is the exact purpose of the ETH_nINT pin on this board?
Does it require any special configuration within the LwIP stack to be used?
Are there any example projects that demonstrate how to handle this interrupt?

Any help would be greatly appreciated.

Thanks,

Mohammed

mƎALLEm · ‎2025-09-17

Hello,

I don't think that pin is used by LWIP and that pin is used as an interrupt output of the ETH PHY.

PG7 is optional and used as GPIO input or EXTI for LINK up/down for example.

Look at NUCLEO-H753 schematic:

This IO was not used.

You need also to refer to the LAN8742A datasheet.

Hope that helps.

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