iMX6D + TJA1100HN (Automotive Ethernet PHY) RMII I/O

[michalkasparek]

Hi all,

Does anyone know if and how it is possible to use iMX6 with NXP ethernet PHY TJA1100HN?

From datasheets it appears that RMII I/O on PHY can run only on 3.3V but iMX6D has 2.5V max.

Is it possible to configure TJA1100HN for 1.8V on RMII I/O? It is not clear from the sheet for me..

Thanks in advance

Michael

[gusarambula · Accepted solution]

Hello Michal Kasparek,

The RGMII interface of the i.MX6D does support only 1.5V, 1.8V and 2.5V.

However, when using RMII interface the NCC_ENET supplies are used, which do support 3.3V. You can find information on the RMII implementation on the i.MX6D on the i.MX6 HW Design Guide.

http://cache.nxp.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf

As for the TJA1100HN, I think it also only supports 3.3V since it’s the standard voltage level of the RMII specification.

I hope this information helps!

[michalkasparek]

Thank you, gusarambula

this helped alot, we somehow missed RMII on iMX6 (described in i.MX6 HW Design Guide in Chapter 12 Using the RMII Interface )

Once again, thank you.