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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1276230/faq-dp83826e-how-does-pin-29-on-dp83826-act-depending-on-strap-mode
增强模式下的 DP83826的引脚是 GPIO、引脚29。 此引脚可以是 LED 或用作 CRS。 当 PHY 设置为 RMII 模式时、该引脚可以重新编程为 LED 或 CRS。 当 MII 进行捆绑时、这个引脚被强制为 CRS。 它不能用作 LED、因为 MII 通信需要 CRS 功能。
