27.3.4.2 Register Write
To execute a polled write:
- Write the ULPIREGADDR register with the address of the PHY register to be accessed.
- Initiate the write to the register by setting the REGACC bit in the ULPREGCTL register.
- Poll the REGCMPLT bit in the ULPIREGCTL register to determine when the access is complete.
- Clear the REGCMPLT bit in the ULPIREGCTL register.