Gigabyte GA-Z77-HD4 Manual - Page 52

xHCI Pre-Boot Driver, xHCI Mode, xHCI Streams, USB2.0 Controller, Audio Controller, Enabled, Disabled

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&& xHCI Pre-Boot Driver 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; when this item is set to Disabled, xHCI Mode will be automatically set to Auto. && xHCI Mode 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 preboot 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 items below will become unconfigurable. && HS Port #1 Switchable~HS Port #4 Switchable 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 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) && Audio Controller Enables or disables the onboard audio function. (Default: Enabled) If you wish to install a 3rd party add-in audio card instead of using the onboard audio, set this item to Disabled. BIOS Setup - 52 -

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BIOS Setup
- 52 -
&
xHCI Pre-Boot Driver
±
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
; when this item is set to
Disabled
,
xHCI Mode
will be automatically set to
Auto
.
&
xHCI Mode
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
items below will become unconfigurable.
&
HS Port #1 Switchable~HS Port #4 Switchable
±
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
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)
&
Audio Controller
Enables or disables the onboard audio function. (Default: Enabled)
If you wish to install a 3rd party add-in audio card instead of using the onboard audio, set this item to
Disabled
.