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您好，0X0017 bit6配置为0试试呢？ 您这里配置的0X0065， 其中bit 6=1 normal operation。
默认为0 = Bypass Asynchronous FIFO。When in RMII Recovered Clock mode, the asynchronous FIFO can be bypassed to reduce the receive path latency within the DP83822. 50-MHz clock is outputted on RX_CLK when in Async fifo bypass 。
这里描述，当配置为Async fifo bypass模式时候，RX_CLK会有 50Mhz输出。
