stm32F411 and Vusb

Hi, I'm trying to understand a Note from Reference Manual page 665. It state:

The V

BUS

pin can be freed by disabling the V

BUS

sensing option. This is done by setting the

NOVBUSSENS bit in the OTG_FS_GCCFG register. In this case the V

BUS

is considered

internally to be always at V

BUS

valid level (5 V).''