IEI Integration NANO-9452 v4.02 - Manual (Page 141)

NANO-9452 EPIC Motherboard
Page 123
 USB 2.0 Controller [Enabled]
Use the USB 2.0 Controller BIOS option to enable or disable the USB 2.0 controller

Disabled USB 2.0 controller disabled

Enabled D EFAULT USB 2.0 controller enabled
 Legacy USB Support [Enabled]
Use the Legacy USB Support BIOS option to enable USB mouse and USB keyboard
support.
Normally if this option is not enabled, any attached USB mouse or USB keyboard does not
become available until a USB compatible operating system is fully booted with all USB
drivers loaded. When this option is enabled, any attached USB mouse or USB keyboard
can control the system even when there is no USB driver loaded onto the system.

Disabled Legacy USB support disabled

Enabled D EFAULT Legacy USB support enabled

Auto Legacy USB support disabled if no USB devices are
connected
 USB2.0 Controller Mode [HiSpeed]
Use the USB2.0 Controller Mode option to set the speed of the USB2.0 controller.

FullSpeed The controller is capable of operating at 12Mb/s

HiSpeed D EFAULT The controller is capable of operating at 480Mb/s
 BIOS EHCI Handoff
Use the BIOS EHCI Handoff option for systems running OSes that do not have EHCI
hand-off support. The EHCI ownership change is managed by the EHCI driver.

Disabled Systems with OSes that do not support EHCI can
use the EHCI handoff functionality.