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docs(esp_eth): added warning to not use ESP32 as ETH CLK source with WiFi

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Ondrej Kosta
2024-08-09 15:53:08 +02:00
parent 6c536b1e7d
commit 025e7b7bd9
3 changed files with 15 additions and 13 deletions
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docs/en/api-reference/network/esp_eth.rst
+4 -2
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@@ -148,8 +148,10 @@ Ethernet driver is composed of two parts: MAC and PHY.
* Disable or power down the crystal oscillator (as the case *b* in the picture).
* Force the PHY device in reset status (as the case *a* in the picture). **This could fail for some PHY device** (i.e. it still outputs signal to GPIO0 even in reset state).
**No matter which RMII clock mode you select, you really need to take care of the signal integrity of REF_CLK in your hardware design!**
Keep the trace as short as possible. Keep it away from RF devices. Keep it away from inductor elements.
.. warning::
If you want the **Ethernet to work with WiFi**, don’t select ESP32 as source of ``REF_CLK`` as it would result in ``REF_CLK`` instability. Either disable WiFi or use a PHY or an external oscillator as the ``REF_CLK`` source.
**No matter which RMII clock mode you select, you really need to take care of the signal integrity of REF_CLK in your hardware design!** Keep the trace as short as possible. Keep the trace as short as possible. Keep it away from RF devices. Keep it away from inductor elements.
.. note::
ESP-IDF only supports the RMII interface (i.e. always select ``CONFIG_ETH_PHY_INTERFACE_RMII`` in Kconfig option :ref:`CONFIG_ETH_PHY_INTERFACE`).