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Can a Gigabit Ethernet PHY using RGMII be connected to a STM32MP157AAB part?

Larry Fey
Associate

‎2021-10-25 09:14 AM

This part uses 354LFBGA package that does not bring out PG4 or PG5 where RGMII clocks are brought out. This would not allow connection to the RGMII_GTX_CLK or RGMII_CLK125 signals.

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3 REPLIES 3
PatrickF
ST Employee

‎2021-10-25 09:42 AM

Hi,

I confirm, those part does not support Gigabit. Only MII and RMII are available.

Please refer to product datasheet (Table STM32MP157A/D features and peripheral counts).

Regards.

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Larry Fey
Associate

‎2021-10-25 09:47 AM

Thanks for the quick response.

Sad that this is the answer.

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PatrickF
ST Employee
In response to Larry Fey

‎2021-10-25 11:57 PM

Hi,

100Mbit/s is still a decent bandwidth for most embedded Linux usages and RMII final solution is usually cheaper (PHY, magnetics, connector costs) and use less pins.

If in the future, you need to build another product with Gbit Ethernet, moving to a package with more IOs (such as LFBGA448 or TFBGA361) will be quite easy and will likely only deserve an update on DT without any SW impact.

Regards.

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