SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
The configuration registers are accessed through the OCP2SCP1 L4 adapter register space using the SCP interface of the DPLLCTRL_USB_OTG_SS. This includes all the configuration signals and returning status signals.
All writes must be 32-bit operations, because the SCP interface always transfers 32 bits; 16- or 8-bit operations may lead to unpredictable errors.
Because the USB3_PHY directly provides parallel data interface clocks RX_CLK and TX_CLK to the USB1 MAC controller, the DPLLCTRL_USB_OTG_SS and DPLL_USB_OTG_SS must be configured before any data transfer between the USB1 controller MAC layer and an external USB3 device.