User`s manual

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3.5.11 USB Configuration
Legacy USB Support (This item is offered in QG2 SKU)
Enables support for legacy USB. Auto option disables legacy support if no USB devices are connected.
USB 2.0 Controller Mode
This item allows you to select Hi-Speed (480 Mbps) or Full-Speed (12 Mbps).
Legacy USB1.1 HC Support (This item is offered in QG2 SKU)
Allows the system to detect the presence of USB devices at startup. If detected, the USB controller legacy
mode is enabled. If no USB device is detected. the legacy USB
support is disabled.