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DP83TC812S-Q1: How to turn off the CLKOUT output

Part Number: DP83TC812S-Q1

Tool/software:

Hello team,

My customer in the test EMI found that the PHY CLKOIT 25MHz radiation is large,
Now they need to turn off the CLKOUT output, and then tried to set the registers 0X453 found that it can't be turned off.
How to close the CLKOUT?

Thank you!