The PLL lock and recalibration signals can be monitored to detect the loss-of-lock condition and the DPLL requirement to recalibrate (caused by a large temperature change since the last lock request):
- The DPLLCTRL_USB_OTG_SS.PLL_STATUS[2] PLL_RECAL bit informs whether the DPLL_USB_OTG_SS must be recalibrated.
The PLL reference clock (CLKINP) loss status and PLL-in-high-jitter condition can also be monitored:
- The DPLLCTRL_USB_OTG_SS.PLL_STATUS[1] PLL_LOCK bit gives the USB3_PHY PLL lock state.
- The DPLLCTRL_USB_OTG_SS.PLL_STATUS[3] PLL_LOSSREF bit informs whether the DPLLCTRL_USB_OTG_SS has lost the reference clock.
- The DPLLCTRL_USB_OTG_SS.PLL_STATUS[5] PLL_HIGHJITTER bit informs whether the PLL has entered a high-jitter condition.