Appendix C Advanced Hardware Configuration Settings
© National Instruments Corporation C-5 VXI-1394 User Manual for Windows
As required by the VXIbus specification, the VXI-1394 drives the 10MHz
signal CLK10 on a differential ECL output when installed in Slot0. The
VXI-1394 generates a 1% accurate CLK10 signal with the onboard
oscillator, or can route a 10 MHz clock from an external high-accuracy
source. When not installed in Slot 0, the VXI-1394 only receives the
CLK10 signal.
Configuration EEPROM
The VXI-1394 has an onboard EEPROM, which stores default register
values that are loaded at power-on. The EEPROM is divided into
twohalves—a factory-configuration half and a user-configuration half.
Both halves were factory configured with the same configuration values so
you can modify the user-configurable half, while the factory-configured
half stores a back-up of the default settings.
The Load Factory switch (switch S6) causes the VXI-1394 to boot off the
factory-configured half instead of the user-modified settings. This is useful
in the event that the user-configured half of the EEPROM becomes
corrupted in such a way that the VXI-1394 boots to an unusable state.
Figure C-3 shows the configuration settings for EEPROM operation.
Figure C-3. EEPROM Operation
YN
LOAD FACTORY
YN
LOAD FACTORY
SLOT0
AUTO
A. Boot from User
Configuration (Default)
YN
LOAD FACTORY
SLOT0
AUTO
B. Boot from Factory
Configuration
NON-
SLOT0
NON-
SLOT0
S6
W1
S6
W1