Gigabyte GA-Z77X-UP5 TH rev. 1.0 User Manual page 58

SATA Mode Selection (Intel Z77 Chipset)
SATA controllers to AHCI mode.
RAID Enables RAID for the SATA controller.
Serial ATA features such as Native Command Queuing and hot plug. (Default)
xHCI Pre-Boot Driver (Intel Z77 Chipset)
Enabled The USB 3.0 ports are routed to the xHCI controller before booting to OS. (Default)
Disabled The USB 3.0 ports are routed to the EHCI controller before booting to OS.
If you want to set xHCI Mode below to Smart Auto, set this item to Enabled
Disabled, the xHCI Mode below will be automatically set to Auto.
xHCI Mode (Intel Z77 Chipset)
Allows you to determine the operating mode for the xHCI controller in OS.
Smart Auto This mode is available only when the BIOS supports the xHCI controller in the pre-boot
environment. This mode is similar to Auto, but it adds the capability to route the ports
to xHCI or EHCI according to setting used in previous boots (for non-G3 boot) in the
pre-boot environment. This allows the use of USB 3.0 devices prior to OS boot. xHCI
controller enabling and rerouting should follow the steps in Auto, when previous boot
routs ports to EHCI. Note: This is the recommended mode when BIOS has xHCI pre-
boot support.
Auto BIOS routes the sharable ports to EHCI controller. Then it uses ACPI protocols to provide
an option to enable the xHCI controller and reroute the sharable ports. Note: This is the
recommended mode when BIOS does NOT have xHCI pre-boot support. (Default)
Enabled All shared ports are eventually routed to the xHCI controller during the BIOS boot
process. If BIOS does not have pre-boot support for the xHCI controller, it should initially
route the sharable ports to the EHCI controller and then prior to OS boot it should route
the ports to xHCI controller. Note: OS has to provide support for the xHCI controller in
this mode. If the OS does not provide support, all sharable ports won't work.
Disabled The USB 3.0 ports are routed to the EHCI controller and the xHCI controller is turned
off. All USB 3.0 devices function as High Speed devices regardless of xHCI software
support/availability. If this item is set to Disabled, the HS Port #1/2/3/4 Switchable
and xHCI Streams
HS Port #1 Switchable~HS Port #4 Switchable (Intel Z77 Chipset)
Enabled Corresponding USB 3.0 port is routed to xHCI. The USB 3.0 device attached on this
port with Super-Speed capability is visible to xHCI controller. (Default)
Disabled Corresponding USB 3.0 port is routed to EHCI. The USB 3.0 device attached on this
port with Super-Speed capability will function as High-Speed.
xHCI Streams (Intel Z77 Chipset)
Enables or disables multi-stream data transfer. Note: For Windows 7 USB 3.0 Streams support, devices
may require UASP class driver updates from UASP driver vendors to be fully compatible with Intel USB
3.0 Streams Support. (Default: Enabled)
USB2.0 Controller
Enables or disables the integrated USB 2.0/1.1 controller. (Default: Enabled)
- 57 - BIOS Setup