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有关RMII连接多个PHY的问题请参考前面帖子wanda地回答,谢谢!
http://www.deyisupport.com/question_answer/f/59/t/18889.aspx
由于AM3715只有一个EMAC,如果使用电路复用接口,接到两个DP83640上,似乎也不能实现两个网络的同时通信。
推荐你看一下AM335X系列,它是集成了两个EMAC的cortex-A8。性能比AM3517有所提升,成本更低。