i.mx8mp ENET RGMII 3.3V worked

[WALNUTY]

Hi,

We want to use RGMII on i.mx8mp, but the ENET uses 3.3V. Could it work?

I tested 3.3V on ENET and found RGMII worked. However, in datasheet, RGMII requestes 1.8V only. 

Could you give advice if it riskly, like stability?

BR.

Hunt Yang

[weidong_sun · Accepted solution]

Dear @WALNUTY ,

See the following screeshot, which is from i.MX8MP datasheet.

NVCC_ENET & NVCC_SAI1_SAI5 can be suppied by 3.3V.

So for Ethernet IO, 3.3V power is no problem.

>>Could you give advice if it riskly, like stability?

Most of gigabit Phy products supports 1.8V / 2.5V IO, it is easy to buy from current market. Actually ethernet phy with 3.3V can also be got, but few kinds of the products. I have ever used KSZ9031, which supports 3.3V IO, you can check it.

Thanks!

Regards,

weidong