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DP83640用于RMII从模式时，X1脚输入50M晶振，那么是通过哪个引脚给MAC侧提供50M参考时钟呢？
RMII从模式时，数据手册中指出由于时序的原因不建议使用CLK_OUT输出时钟给MAC提供参考。 这样的话，只能通过外接时钟源给MAC提供参考。
