iMX6 RGMII level

[tarterkit_ru]

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?

[david_babin · Accepted solution]

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.

[zhanghan]

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？

[rveer]

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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[tarterkit_ru]

Great!
Thanks!