Chapter 3
VXIpc 800 Series Configuration and Installation
©
National Instruments Corporation
3-5
VXIpc 800/700 Series User Manual
Figure 3-2. VXIbus Slot Configuration
When the VXIpc-800 is installed in Slot 0, 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-800 also drives the
16 MHz VXIbus system clock by an onboard 16 MHz oscillator.
As required by the VXIbus specification, the VXIpc-800 drives the
10 MHz signal CLK10 on a differential ECL output when installed in
Slot 0. When not installed in Slot 0, the VXIpc-800 only receives the
CLK10 signal.
VXIbus CLK10 Routing
When the VXIpc-800 is installed in Slot 0 of your mainframe, it
supplies the VXIbus CLK10 signal. The VXIpc-800 can use two
different sources to generate this signal: an onboard oscillator, or the
external CLK SMB connector. Use switch S3 to select these options, as
shown in Figure 3-3.
Notice that Figure 3-3b also shows switch S5. You must configure these
switches as shown when using the corresponding CLK10 source setting
of S3.
W13
a. Manual Non-Slot 0
Configuration
W13
b. Automatic Slot 0
Detection (Default)
W13
c. Manual Slot 0
Configuration
