topic iMX6 RGMII level in i.MX Processors

iMX6 RGMII level

tarterkit_ru — Fri, 26 Oct 2012 08:25:22 GMT

Datasheet have "RGMII I/O supply voltage: 1.14 - 1.5 - 1.9V"

But as i know, some boards with iMX6 have KSZ9021RN ethernet PHY and it have RGMII IO 2.5/3.3V

I can't find datasheet of AR8031 for understanding how RGMII IO supply in development board, but as i know RGMII IO 1.5-1.8V it only for RGMII V2.0 specification but brief pdf of AR8031 dont have RGMII V2.0

What volages can be supply to RGMII I/O?

Re: iMX6 RGMII level

david_babin — Fri, 26 Oct 2012 13:36:13 GMT

The new MX6 data sheet on extranet shows RGMII I/O supply voltage range 1.15 - 2.625 V. So, MX6 is very flexible. The supply voltage you use depends on the PHY. With AR8031, use 1.5 V for the I/O supply. With KSZ9021, use 2.5 V on the I/O supply.

Re: iMX6 RGMII level

tarterkit_ru — Fri, 26 Oct 2012 13:43:15 GMT

Great!
Thanks!

Re: iMX6 RGMII level

rveer — Fri, 12 Jul 2013 13:52:50 GMT

Hi David,

I am facing same clock issue with custom iMX6 board where an marvell switch is connected via RGMII.could you please suggest me, how can I configure to increase voltage from 1.8V to 2.5 V on RGMII line from SoC side?.

Regards

Raj

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Re: iMX6 RGMII level

zhanghan — Thu, 27 Sep 2018 02:25:30 GMT

hello if i use 1.8V at PHY ,then i should use 1.8V at imx6 ，I want to communicate via RJ45 as pic below.

but i find when i use 1.8V ,the bit of MODE[2] Rxclk should be 1 as pic below.

That is the mode is x1xx，and there is no mode can access 1000M speed。

Am I wrong?What should I do？