NVCC_RGMII for i.MX6Q i.MX6QP

[zzh476872254]

Hello,

I made a board with reference to SPF-28857, but I found that when NVCC_RGMII (pin is G18) is not supplied, NVCC_RGMII itself has a voltage of about 3V. Why?

Then I don't power NVCC_ENET and found that NVCC_ENET itself has a voltage of about 2.8V.

I don't understand why they have voltage.

In IMX6DQCEC, the voltage range of NVCC_RGMII is 1.15V to 2.625V.

[igorpadykov]

Hi zhihua

for i.MX6Q ethernet power supplies usage and description one can check

i.MX6 System Development User’s Guide

https://www.nxp.com/docs/en/user-guide/IMX6DQ6SDLHDG.pdf

Best regards
igor
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[zzh476872254]

Thank you very much!

I know where the problem is, because the IO port of my PHY chip is 3.3V, so the voltage is injected from the IO port of the RMII to the NVCC_RGMII pin.

Then I modified the IO port supply voltage of the PHY chip, and now the voltage of the NVCC_RGMII pin is normal.