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1.请问板子中PORT B的TX与H2019的RX相连，对我用PORT B电口发送数据包有什么影响吗？
CON-MII-MAlE中的TX_EN与TXD【3：0】与J7的相应引脚之间有一个33欧的电阻，请问这个电阻的用处是什么？
