Chapter 3
VXIpc 800 Series Configuration and Installation
VXIpc 800/700 Series User Manual
3-8
©
National Instruments Corporation
Figure 3-7. SMB Trigger Input Termination
EEPROM
The VXIpc-800 has an onboard EEPROM, which stores default register
values for the VXI circuitry. These values are loaded when you power
up the computer. These values read from the EEPROM tell the PCI
interface of the VXIbus registers so that the VXI interface is ready to
respond to Resource Manager accesses within the required 5 s of
SYSRST* deasserting. You can use switch S2 to disable this power-on
self-configuration (POSC) circuit. Although this makes the VXI
circuitry unusable, it is sometimes helpful in debugging address and
interrupt conflicts with add-in boards. In general, however, you should
leave switch S2 in its factory-default setting. Figure 3-8 shows the
possible configurations for S2.
Figure 3-8. Power-On Self Configuration Status
The EEPROM is divided into two halves; one half is factory configured
and one half is user configurable. Use switch S9 to control the operation
of the EEPROM. The setting of this switch determines whether the
VXIpc-800 boots off the factory-configured half or 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 VXIpc-800 boots
to an unusable state. In its default setting, the VXIpc-800 boots off the
user-configurable half.
S7
S7
a. Does Not Terminate
Trigger Input (Default)
b. Terminate Trigger
Input
S2
S2
a. VXI Circuitry Loads Power-on
Defaults from EEPROM (Default)
b. Power-on Self Configuration
Circuit is Disabled
