Can i Use Realtek RTL8211F-CG with Stm32H7

[Meer]

Hi everyone,

I have a schematic using the Realtek RTL8211F-CG Gigabit Ethernet PHY and I want to connect it directly to an STM32H7 microcontroller for Ethernet communication.

My questions are:

1. The STM32H7 Ethernet MAC supports MII and RMII only. The RTL8211F-CG is a Gigabit PHY that primarily uses RGMII. Is there any way to make it work with STM32H7 without adding an intermediate chip like LAN8720 or DP83848?
2. The RTL8211F-CG datasheet mentions it can operate at 10/100 Mbps as well — but does it support a true RMII mode that the STM32H7 MAC can talk to?
3. Has anyone successfully used the RTL8211F-CG with STM32H7 directly? If so, what interface mode did you configure on the PHY side, and what changes were needed in CubeMX/HAL?
4. If this is not possible at all, what is the simplest/cheapest alternative 10/100 PHY that works reliably with STM32H7 in RMII mode?

Any help or experience is appreciated. Thanks!

[mƎALLEm · Accepted solution]

Hello,

A question that you need to address to Realtek

[Andrew Neil]

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@Meer wrote:

2. The RTL8211F-CG datasheet mentions it can operate at 10/100 Mbps as well — but does it support a true RMII mode that the STM32H7 MAC can talk to?

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You would have to ask RealTek that.

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@Meer wrote:

4. If this is not possible at all, what is the simplest/cheapest alternative 10/100 PHY that works reliably with STM32H7 in RMII mode?

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Simplest, surely, would be to use whatever the ST boards use?

[Meer]

Thanks for your comment. I will asked to RealTek