Advantech MIC-770 User Manual page 63

3.2.2.15 USB Configuration
Legacy USB support

This is to support USB devices under legacy OS such as DOS. When choosing
Auto, the system will automatically detect if any USB devices are plugged into
the computer and enable USB legacy mode when a USB device is plugged in
and disable USB legacy mode when no USB device is plugged in.
XHCI hand-off

This is a workaround for OS without XHCI hand-off support. The XHCI owner-
ship change should be claimed by the XHCI driver.
USB mass storage driver support

Enable or Disable USB Mass Storage driver support.
USB transfer time-out

Allows you to select the USB transfer time-out value. [1, 5, 10, 20 sec]
Device reset time-out

Allows you to select the USB device reset time-out value. [10, 20, 30, 40 sec]
Device power-up delay

Maximum time the device will take before it properly reports itself to the Host
Controller. Auto uses the default value: for a Root port it is 100 ms, for a Hub
port the delay is taken from the Hub descriptor.
Figure 3.32 USB Configuration
51 MIC-770 User Manual