Appendix C Advanced Hardware Configuration Settings
© National Instruments Corporation C-3 VXI-MXI-Express Series User Manual
Figure C-2 shows the configuration settings for EEPROM operation.
Figure C-2. EEPROM Configuration
Power-On Self Configuration
The VXI-MXI-Express Series controller has an onboard EEPROM, which
stores default register values for the VXI circuitry. These values are loaded
when you power up the computer. The values read from the EEPROM
program the PCI interface and the VXIbus registers so that the VXI
interface is ready torespond to Resource Manager accesses within the
required 5seconds of SYSRST# deasserting.
You can disable this power-on self-configuration (POSC) circuit by
changing switch W8. Although this makes the VXI circuitry unusable,
it iss ometimes helpful in debugging address and interrupt conflicts
with add-in boards. In general, however, you should leave W8 in its
factory-default setting. FigureC-3 shows the possible configurations
forW8.
Figure C-3. Power-on Self Configuration Status
How to Fix an Invalid EEPROM Configuration
Use MAX under Windows to edit the VXI-MXI-Express Series controller
configuration. Some of these settings are stored in files that the NI-VXI
software reads, while other settings are stored directly in the
VXI-MXI-Express Series controller EEPROM.
Certain EEPROM configurations, including invalid configurations, can
lock up your computer while it is booting. Generally, only the size and
a. Boot from User
Configuration (Default)
b. Boot from Protected
Configuration
W5 W5
2
3
1
2
3
1
a. Enable (default) b. Disable
W8
231
W8
231