topic Re: Ethernet on i.MX RT 1020 is there a way I can control the ethernet port on / off functionality in i.MX RT Crossover MCUs

Ethernet on i.MX RT 1020 is there a way I can control the ethernet port on / off functionality

Deepa-khatri2588 — Wed, 01 Apr 2026 14:19:32 GMT

Hi,

I am using Ethernet on the i.MX RT 1020 and I am planning to use multiple of RT1020. Is there a way where I can just activate one Ethernet switch and deactivate others .That is is there a possibility to activate , deactivate the ethernet switch via s/w or h/w.

Re: Ethernet on i.MX RT 1020 is there a way I can control the ethernet port on / off functionality

mayliu1 — Thu, 02 Apr 2026 09:39:54 GMT

HI @Deepa-khatri2588 ，

Thank you so much for your interest in our products and for using our community.

Please note that RT1020 integrates an Ethernet MAC but requires an external PHY, as no internal PHY is included.

Therefore, Ethernet enable/disable control should be considered at two levels: external PHY control and internal MAC control.

1： If the PHY on your board supports power‑down control via MDIO, software can manage it through the MDIO interface. Alternatively, if the PHY RESET pin is connected to a GPIO, the PHY can be reset or held in reset.

2: The ENET MAC can be controlled by the Ethernet Control Register (ECR):

You can disables the MAC or set MAC into sleep mode.

Wish it helps you

Best Regards

MayLiu

Re: Ethernet on i.MX RT 1020 is there a way I can control the ethernet port on / off functionality

Deepa-khatri2588 — Thu, 02 Apr 2026 14:35:39 GMT

@mayliu1 Thanks for the info , Where can i find the document with register details .I did check the data sheet and couldn't find any thing related to the registers.

Re: Ethernet on i.MX RT 1020 is there a way I can control the ethernet port on / off functionality

mayliu1 — Fri, 03 Apr 2026 01:46:58 GMT

Please open the link below, and download the IMXRT1020RM file.

https://www.nxp.com/products/i.MX-RT1020