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http://www.microchip.com/wwwproducts/en/LAN8720A
http://www.microchip.com/wwwproducts/en/LAN8710A
AN8.13 - Suggested Magnetics
LAN8720AI QFN Rev A Schematic Checklist

等。

参考原理图：

Image Added

RX/TX的50欧上拉我们在核心板已经有实施，因此在底板不需要加。

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