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Associate II
July 8, 2026
Question

STM32N657-DK NetX Duo WebServer example works at 100 Mbps and 1 Gbps but not at 10 Mbps

  • July 8, 2026
  • 1 reply
  • 57 views

Hi,

I am using the STM32N657-DK and running the NetX Duo WebServer example provided by STM32Cube. The application works correctly when the Ethernet link is negotiated at 100 Mbps and 1 Gbps. However, when the link speed is 10 Mbps, the web server is not reachable and communication fails.

Setup

  • Board: STM32N657-DK
  • Software: STM32CubeIDE / STM32Cube firmware NetX Duo WebServer example
  • PHY: (RTL8211F-CG, if applicable)
  • Interface: RGMII

Observations

  • 1 Gbps: Works correctly.
  • 100 Mbps: Works correctly.
  • 10 Mbps: Link appears to come up, but the web server cannot be accessed and network communication fails.

Questions

  1. Does the STM32N657-DK NetX Duo Ethernet driver fully support operation at 10 Mbps?
  2. Is there any additional MAC or PHY configuration required when the negotiated speed is 10 Mbps?
  3. Are there any known limitations or issues with the NetX Duo Ethernet driver or HAL Ethernet driver when operating at 10 Mbps?
  4. Has anyone successfully run the NetX Duo WebServer example at 10 Mbps on the STM32N657-DK?

Any suggestions on debugging or configuration changes would be appreciated.

Thank you.

1 reply

mƎALLEm
ST Technical Moderator
July 8, 2026

Hello,

Such kind of questions (Ethernet related stack questions) should be posted in the STM32 MCU Embedded software forum board.

I move the post then.

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.