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dp83848c没有rx_clk

Other Parts Discussed in Thread: DP83848C

我现在在用hi3531+dp83848c的方式,现在phy芯片配支撑mii模式,然后执行ping指令ping电脑的时候我在电脑上用wireshark能抓到发上来的广播包,但是板子没有收到电脑回发的包,然后测了一下rx_clk发现没有波形,这个时钟是从phy收到的数据提取出来的吗?这种情况一般可能的原因是什么样的?