Chapter 2 Installation and Configuration
NI PXI-8109 User Manual 2-10 ni.com
settings. The default value for this setting is Enabled. If this setting is
disabled, the bus, memory, and I/O options disappear from this
submenu. Disabling this setting effectively sets Reserved Buses to 0,
Reserved Memory to 0M, and Reserved I/O to 0K.
• Reserved Buses—This setting determines the number of PCI buses
that will be reserved by the BIOS for ExpressCard PCI-PCI bridges
that may be hot-plugged in the ExpressCard slot. The default value for
this setting is 8 PCI buses.
• Reserved Memory—This setting determines the amount of memory
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 64M bytes of memory.
• 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 enables or disables USB
overcurrent reporting. The default 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.
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