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DP83640: RX_CLK, TX_CLK, CLK_OUT can provide 50-MHz , which one is recommended?

Part Number: DP83640

Tool/software:

Dears:

Customer use RMII master mode, they want to have 50MHz for CPU. I noticed that RX_CLK, TX_CLK, CLK_OUT can provide 50-MHz , Could you please help check which one is better to use ? Thanks.