Chapter 4
VXIpc 700 Series Configuration and Installation
©
National Instruments Corporation
4-5
VXIpc 800/700 Series User Manual
Trigger Input Termination
You can use jumper W12 to terminate the external trigger input SMB
with 50
Ω
to ground. Figure 4-3a shows the default setting for a non-
terminated trigger input SMB. Use the setting of Figure 4-3b to
terminate the trigger input SMB.
Figure 4-3. SMB Trigger Input Termination
EEPROM
The VXIpc-700 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 change jumper W10 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 W10 in its factory-default setting. Figure 4-4 shows the
possible configurations for W10.
Figure 4-4. Power-On Self Configuration Status
The EEPROM is divided into two halves; one half is factory configured
and one half is user configurable. Use jumper W7 to control the
operation of the EEPROM. The setting of this jumper determines
W12
W12
a. Trigger Input
Unterminated (Default)
b. Terminate Trigger Input
a. VXI Circuitry Loads Power-on
Defaults from EEPROM (Default)
b. Power-on Self Configuration
Circuit is Disabled
W10
W10
