Chapter 2
Installation and Configuration
©
National Instruments
2-11
NI PXIe-8133 User Manual
•
Reserved I/O
—This setting determines the amount of I/O space, in
bytes, that will be reserved by the BIOS for PCI-PCI bridges that may
be hot-plugged in the ExpressCard slot. The default value for this
setting is
4K
bytes of I/O space.
USB Configuration Submenu
Use this submenu to apply alternate configurations to the USB ports.
Normally, you do not need to modify these settings, as the factory default
settings provide the most compatible and optimal configuration possible.
•
USB Devices
—This item lists the total number of devices detected in
the system, categorized by device type.
•
Legacy USB Support
—This setting specifies whether or not legacy
USB support is enabled. Legacy USB support refers to the ability to
use a USB keyboard and mouse during system boot or in a legacy
operating system such as DOS. The default value is
Enabled
.
Note
Certain real-time applications may require you to disable this setting to reduce loop
time jitter. When the controller is configured to boot LabVIEW RT, legacy USB support is
automatically disabled.
•
Overcurrent Reporting
—This setting allows the BIOS to notify the
operating system of any USB ports which source too much current.
The default value for this setting is
Disabled
.
•
Transfer Timeout
—This setting specifies the timeout value for
Control, Bulk, and Interrupt USB transfers. The default value for this
setting is
20
seconds.
•
Device Reset Timeout
—This setting specifies the number of seconds
the Power-On Self Test will wait for a USB mass storage device to
start. The default is
20
seconds.
•
Device Power-up Delay
—This setting specifies the maximum time a
device will take before it properly reports itself to the host controller.
When set to
Auto
, a root port is granted 100 ms, and for a hub port, the
delay value is taken from the hub descriptor. The default value for this
setting is
Auto
.
•
Device Power-Up Delay in Seconds
—This setting specifies the
number of seconds the Power-On Self Test will wait for a USB device
or hub to power on. This setting is only visible if
Device Power-Up
Delay
is set to
Manual
. The default is
5
seconds.
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