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使用RM46L852的MII模式和KSZ8863RLL交换芯片通信,我现在还没有使用MDIO进行寄存器初始化,但是KSZ8863RLL的port1和port2不能实现交换机功能,这是KSZ8863RLL还没有正常工作?还是我没有对它初始化是不会工作?RSTN管脚已经拉高。