SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
After power up, the DPLL_USB_OTG_SS.SYSRESETN input is automatically pulled low by the PRM, together with the DPLLCTRL_USB_OTG_SS.RESET_N input. Because PRM.L3INIT_RST is an asynchronous reset, the DPLL_USB_OTG_SS input clock (DPLL_USB_OTG_SS.CLKINP) is not demanded upon reset. The LOSSREF signal, which monitors the presence of CLKINP clock, remains 1 during SYSRESETN = 0 irrespective of presence/absence of the CLKINP clock. If CLKINP is present when reset is asserted, the LOSSREF signal is deasserted to 0, a certain time after the hardware reset completes. During DPLL power-up mode, CLKDCOLDO clock is maintained inactive (pulled low). After power-up reset, the DPLL_LOCK (internal lock loop) signal is maintained deasserted, too.