Chapter 3
Configuration and Installation
VXI/VMEpc 600 Series User Manual
3-10
©
National Instruments Corporation
MITE EEPROM
The VXI/VMEpc 600 Series has an onboard EEPROM, which stores
default register values for the VXI/VME circuitry. These values are loaded
when you power up the computer. These values read from the EEPROM
tell the PCI interface of the VXI/VMEbus registers so that the VXI/VME
interface is ready to respond to Resource Manager accesses within the
required 5 s of SYSRST* deasserting. You can use jumper W1 to disable
this power-on self-configuration (POSC) circuit. Although this makes the
VXI/VME circuitry unusable, it is sometimes helpful in debugging address
and interrupt conflicts with add-in boards. In general, however, you should
leave jumper W1 in its factory-default setting. Figure 3-10 shows the
possible configurations for W1.
Figure 3-10.
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 W9 to control the operation
of the EEPROM. The setting of this jumper determines whether the
VXI/VMEpc 600 Series 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
VXI/VMEpc 600 Series boots to an unusable state. In its default setting,
the VXI/VMEpc 600 Series boots off the user-configurable half.
W1
W1
a. VXI Circuitry Loads Power-on
Defaults from EEPROM
(Default)
b. Power-on Self Configuration
Circuit is Disabled