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B1SA4-2750F/B1SA4-2550F Motherboard User’s Manual
tRTP - the options are Auto, 4 through 7.
tRRD - the options are Auto, 4 through 7.
tFAW - the options are Auto, 16 through 33.
tCCD - the options are Auto, 4, 12 and 18.
tWTP - the options are Auto, 15 through 30.
tWCL - the options are Auto, 5 through 9.
South Bridge
USB Conguration
This submenu displays the following sub-items:
•USB Module Version
•USB Devices
Legacy USB Support
This feature enables support for legacy USB devices. Select Auto to disable
legacy support if USB devices are not present. Select Disable to have USB
devices available only for EFI applications. The options are Enabled, Disabled
and Auto.
XHCI Hand-Off
This item is a work-around solution for operating systems that do not support
XHCI (Extensible Host Controller Interface) hand-off. The XHCI ownership
change should be claimed by the XHCI driver. The options are Enabled and
Disabled.
EHCI Hand-Off
This item is for the Operating Systems that do not support Enhanced Host
Controller Interface (EHCI) hand-off. When this item is enabled, EHCI owner-
ship change will be claimed by the EHCI driver. The settings are Enabled and
Disabled.