Chapter 2
Installation and Configuration
2-8
ni.com
•
Legacy USB Support
—Use this setting to use a USB keyboard and
mouse as if they were standard PS/2-style peripherals. You
must
enable
this setting to use these devices in operating systems with no USB
support and to boot from a USB floppy or CD-ROM. The BIOS setup
screen always works with USB keyboards regardless of this setting.
Certain real-time applications may require you to disable this setting
to reduce loop time jitter. The default is
Enabled
.
PXI Setup Menu
Use this menu to control and route certain signals on the PXI backplane.
Normally, you do not need to modify these settings. However, other
sections of this manual may indicate that modifications are necessary
and may lead to unpredictable behavior.
•
INTP Routing
—The INTP signal cannot be routed. This setting will
always report
Not Supported
.
•
INTS Routing
—You can route INTS to the controller’s 21-frame
serialized IRQ input, for use by certain PXI carrier cards. The default
setting is
Not Routed
.
•
APIC Routing
—This item is valid only for Windows XP and 2000
and other modern operating systems. Also, a fresh install of the OS
must occur for changes to the APIC Routing to take effect. Select
Enabled
to initialize the IOAPIC and local APIC in uniprocessor
mode. Select
Disabled
to use the legacy PIC for interrupt routing. The
default setting is
Enabled
.
•
PIRQx Routing
—This setting selects the routing option for PXI/PCI
devices connected to PIRQx. This settings affects OSes that do not use
APIC routing. The default setting for all PIRQx options is
IRQ10
.
•
Per-Slot Device Settings
—This setting brings up the
Per-Slot Device
Settings
Per-Slot Device Settings Submenu
section.
Per-Slot Device Settings Submenu
Use this menu to configure options that can be modified for individual PCI
devices in a PXI chassis.
Note
Scanning for Option ROMs on devices behind a PCI bridge cannot be disabled.