AN 26.20 SMBus Slave Interface for the USB553XB
The SMBus slave interface can be used to customize the functionality of the USB553XB hub. Through this interface the SOC is able to control the digital and USB lines for internal testing, configure the hub to function with the desired options when enumerating, and load custom firmware to fully unlock
the features of the embedded processor.
USB5532, USB5533, USB5534, USB3377