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TMS570LC4357: TMS570LC4357 LWIP RMII PING 问题

Part Number: TMS570LC4357

现在遇到了一个问题。TMS570LC4357移植了LWIP,使用RMII模式,用网线直连电脑。用电脑一直发ping包,给单板。查看单板上的EMAC寄存器,RXFRAGMENTS寄存器一直增加,证明EMAC有收到数据。但是RXGOODFRAMS寄存器一直是0,这应该如何排查问题?可能是哪里出问题。

当使用RMII模式时,EMAC模块的时钟应该设置为多少频率?

望解答,十分感谢