交换机架构补充RMII

RMII相对于MII的框图如下： 省去TX_ER原因是不需要。时钟采用50M共同时钟。 省去RX_ER原因是：引自RMII specification RX_ER is important for meeting Hamming Distance requirements. However, PHYs have the possibility of introducing data replace

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