topic ENET2 MDIO pin conflict in i.MX RT Crossover MCUs

ENET2 MDIO pin conflict

jautry — Wed, 09 Mar 2022 03:22:34 GMT

I am having an issue where if I SetPinMux on GPIO_EMC_39_ENET2_MDIO on an iMXRT1062, the system crashes. Is there some interaction with some other module or pin that is used that would cause this? I need to use both MACs independently for two LAN ports.

Re: ENET2 MDIO pin conflict

nickwallis — Wed, 09 Mar 2022 07:03:08 GMT

See this thread for an explanation:

https://community.nxp.com/t5/i-MX-RT/target-crashes-writing-to-register-SW-MUX-CTL-PAD-GPIO-SD-B1-05...

Also note, you can share one management interface (MDC/MDIO) between the two ethernet interfaces, you need to set a different address on the PHY.

-Nick

Re: ENET2 MDIO pin conflict

nickwallis — Wed, 09 Mar 2022 07:37:09 GMT

Please refer to this post:

https://community.nxp.com/t5/i-MX-RT/target-crashes-writing-to-register-SW-MUX-CTL-PAD-GPIO-SD-B1-05/m-p/1148049

Also note, you can share one management interface (MDC/MDIO) between the 2 ethernet interfaces, you just need to set a different address on the PHY.

-Nick

Re: ENET2 MDIO pin conflict

jautry — Mon, 21 Mar 2022 21:28:40 GMT

Do you know what the base address is for the ENET management interface? Could not find it in the reference manual and need it for device tree.