Portwell COM Express PCOM-B645VGL, User Manual

Page: 58 / 83

COM Express
™
PCOM‐B645VGL R0 User Manual
Copyright © PORTWELL 2020 PCOM-B645VGL 58
Feature Description Options
Legacy USB Support
Enables Legacy USB support. AUTO option disables legacy support if no USB
devices are connected. DISABLE option will keep USB devices available only for
EFI application
★
Enabled , Disabled, Auto
XHCI Hand‐off
This is a workaround for OSes without XHCI hand‐off support. The XHCI
ownership change should be claimed by XHCI driver.
★
Enabled , Disabled
USB Mass Storage Driver
Support
Enable/Disable USB Mass Storage Driver Support
★
Enabled , Disabled
USB 3.0 Port 0~1
Enable/Disable this USB Physical Connector (physical port). Once disabled, any
USB devices plug into the connector will not be detected by BIOS or OS
★
Enabled ,Disabled
USB 2.0 Port 0~7
Enable/Disable this USB Physical Connector (physical port). Once disabled, any
USB devices plug into the connector will not be detected by BIOS or OS
★
Enabled ,Disabled
USB transfer time‐out The time‐out value for Control, Bulk, and Interrupt transfers.
★
20 sec , 1, 5, 10
Device reset time‐out USB mass storage device Start Unit command time‐out.
★
20, 10, 30, 40 sec
Device power‐up delay
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.
★
Auto, Manual
Device power‐up delay in
seconds
Delay range is 1..40 seconds, in one second increments
★
5