Powering On the MXI-Express x4 System
1.
Power on all of the expansion chassis in any order you choose.
2.
Power on the host.
Note
There are no requirements on how MXI-Express x4 expansion chassis
are powered up relative to each other, as long as they are all on before the
computer is powered on.
3.
Observe the LED status on the PCIe-8371, PCIe-8372, PXIe-8370, and PXIe-8374 where
applicable. A properly connected and powered up system should report a valid link and
power status on all of these boards once the host PC is powered on. Refer to the
LED
Indicators
section for more information.
Typical PCI-PCI bridges and switches are used to add PCI devices to a PCI hierarchy in
which all the bridges and devices are contained within a single chassis. Because of this,
BIOSes and operating systems make the assumption that all PCI devices in the entire
hierarchy will be available as soon as code execution begins at power-up time. This
assumption means that all of the expansion chassis must be turned on before the host PC
for the BIOS and OS to correctly configure a MXI-Express x4 system.
Powering Off the MXI-Express x4 System
Because operating systems and drivers commonly make the assumption that PCI devices will
be present in the system from power up to power down, it is important to not power off the
expansion chassis until after the host PC is powered off. Powering off the expansion chassis
while the host is still on can cause crashes or hangs. However, once the host PC is powered
off, the order that you power off the expansion chassis is not important.
Note
To power down the chassis while the host PC or host chassis is on, you may
need to hold the power button for at least four seconds. However, this behavior
cannot be guaranteed.
PXIe-8370 (194402x-02) LEDs
The LEDs on MXI-Express x4 boards give status information about power supplies and link
state. The PXIe-8370 has two LEDs, one for power supply status and one for link state.
Table 4. LED Status Descriptions
Board
LED
Color
Meaning
PXIe-8370 (194402
x
-02)
PWR
Off
No power
Blinking red
Power is out of spec
Solid green
Power is within spec
LINK
Off
Link not established
Solid green
Link established
PXIe-8370 User Manual
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© National Instruments
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