Appendix D
Common Questions
©
National Instruments Corporation
D-5
VXI-1394 Interface for Windows NT/98
Notice that
VXIinReg()
and
VXIoutReg()
are for VXI devices only, but
you can use
VXIin()
and
VXIout()
for both VXI and VME.
Finally, if you are using LabVIEW or LabWindows/CVI and you have
instrument drivers for the devices in your chassis, you can use the
interactive features of these programs to quickly test the functionality of
the devices.
What should I do if I get a
Configuration EEPROM is Invalid
message?
There are several reasons why you might get the
Configuration EEPROM
is Invalid
message. If you turned off the VXI chassis while the
configuration update process was still in progress, the board functions
normally except when running T&M Explorer. To correct these problems,
reboot the VXI chassis with the Load Factory switch set (as described in
Appendix C,
Advanced Hardware Configuration Settings
) and update the
configuration, or load the configuration from file.
What do the LEDs on the front of the VXI-1394 mean?
•
The SYSFAIL LED shows the state of the VXI/VMEbus SYSFAIL
line. This line is asserted whenever any device in the chassis has not
yet passed its self test, if it has failed its self test, or if it has detected a
failure after originally passing its self test.
•
The 1394 LED indicates that the VXI-1394 is being accessed by
another device on the IEEE 1394 bus, such as when the computer
communicates with either the VXI-1394 or another device in the
chassis.
•
The VXI LED, when lit, indicates that the VXI-1394 is being accessed
by another device in the VXI chassis, such as when a bus master inside
the chassis wants to talk to either the VXI-1394 or memory in the
computer.
What kind of signal is CLK10 and what kind of signal do I need for an
external CLK10?
CLK10 is a differential ECL signal on the VXIbus backplane. However, the
oscillator for the VXI-1394 and the EXTCLK input from the front panel
use TTL. Therefore, supply a TTL-level signal for EXTCLK, and our
voltage converters will convert the signal to differential ECL.
