SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
When DPLL_USB_OTG_SS finishes calibration and lock sequences it enters a locked state. During the locked state, LOSSREF and BYPASSACK are deasserted, FREQLOCK or PHASELOCK is asserted.
DPLL lock event criteria (FREQLOCK or PHASELOCK) is software-selectable through the DPLLCTRL_USB_OTG_SS.PLL_CONFIGURATION2[10:9] PLL_LOCKSEL bit field.
The DPLL signalizes the locked state to DPLLCTRL_USB_OTG_SS, USB_OTG_SS core controller, and USB3_PHY through assertion of the DPLL_LOCK signal, which reflects the internal lock loop status. The user software can monitor the DPLL locked event in the DPLLCTRL_USB_OTG_SS.PLL_STATUS[1] PLL_LOCK bit, which is active high.