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AM4376: can change rgmii link speed?

Part Number: AM4376


I connected am4376 and l2 switch(rtl8367) with rgmii interface.

In this case, i want to change rgmii link speed 1000M to 100M. 

When l2 switch linked 100M bps with external rj-45, clock pin of rgmii in AM4376 was not change 25Mhz in our board. fixed 125Mhz.

If link speed can change in software, how to change rgmii link speed?