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AM5728: USB3.0 spread spectrum clocking

Part Number: AM5728

Hi,

According to the specifications of USB3.0, SSC(Spread Spectrum Clocking) must be effective.
In AM572x, how should it come true?

SSC Parameters:
Modulation Rate min 30 max 33 kHz
SSC deviation min +0/-4000 max +0/-5000 ppm

When it is set in DPLLCTRL_USB_OTG_SS, it seems that it is fixed because it is a standard of USB3.0.
Please tell me the set the value of the following register of DPLLCTRL_USB_OTG_SS.
PLL_SSC_CONFIGURATION1
PLL_SSC_CONFIGURATION2

Best Regards,
Shigehiro Tsuda