User manual

37 ARK-1122 User Manual
Chapter 3 BIOS Settings
3.2.2.5 USB Configuration
Figure 3.8 USB Configuration
 Legacy USB Support
Enable the support for legacy USB. Auto option disables legacy support if no
USB devices are connected.
 EHCI Hand-Off
This is a workaround for the OS without EHCI hand-off support. The EHCI own-
ership change should be claimed by EHCI driver.
 USB transfer time-out
Set the time-out value for Control, Bulk, and Interrupt transfers.
 Device reset time-out
Set USB mass storage device Start Unit command time-out value.
 Device power-up delay
Set the maximum time the device will take before it properly reports itself to the
Host Controller. 'Auto' uses default value: for a Root port it is 100 ms, for a Hub
port the delay is taken from Hub descriptor.