Chapter 3
Configuration and Default Settings
©
National Instruments Corporation
3-5
VXIpc 770/870B Series User Manual
Slot 0 Detection/System Controller
The VXIpc 770/870B Series is configured at the factory to automatically
detect if it is installed in Slot 0 of a VXIbus mainframe. With automatic
System Controller slot detection, you can install the module into any
VXIbus slot.
You can manually configure the VXIpc 770/870B Series for either System
Controller or Non-System Controller operation by defeating the
automatic-detection circuitry. Use the three-position jumper J17 to select
automatic detection, System Controller, or Non-System Controller
operation. Figure 3-5 shows these three settings.
Caution
Do
not
install a device configured for System Controller into another slot
without first reconfiguring it to either Non-System Controller or automatic-detection
configuration. Neglecting to do this could result in damage to the device, the VXIbus
backplane, or both.
Figure 3-5.
System Controller Slot Configuration
When the VXIpc 770/870B Series is installed in Slot 0 of a VXI system,
it becomes the VXIbus System Controller. In this role, it has VXIbus Data
Transfer Bus Arbiter circuitry that accepts bus requests on all four VXIbus
request levels, prioritizes the requests, and grants the bus to the highest
priority requester. As VXIbus System Controller, the VXIpc 770/870B
Series also drives the 16 MHz VXIbus system clock by an onboard 16 MHz
oscillator.
As required by the VXIbus specification, the VXIpc 770/870B Series
drives the 10 MHz signal CLK10 on a differential ECL output when
installed in Slot 0. When not installed in Slot 0, the VXIpc 770/870B Series
only receives the CLK10 signal.
b. Automatic Slot 0
Detection (Default)
J17
a. Manual Slot 0
Configuration
J17
c. Manual Non-Slot 0
Configuration
J17
