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.
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
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
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.