DP83640 在使用光模块时,不使用FXSD这个引脚可以吗,就是让光模块的SD引脚悬空,只是使用电源和地,还有四个引脚 TX和RX。
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使用光模块时,首先需要将FX_EN引脚通过一2.2Kohm电阻下拉enable fiber mode。另外,关于光模块的SD引脚可直接和DP83640的LED_Speed/FX_SD引脚相连。