Chapter 3
Configuration and Installation
©
National Instruments Corporation
3-7
VXI/VMEpc 600 Series User Manual
When the VXI/VMEpc 600 Series is installed in Slot 0 of a VXI system or
Slot 1 of a VME system, it becomes the VXI/VMEbus System Controller.
In this role, it has VXI/VMEbus Data Transfer Bus Arbiter circuitry that
accepts bus requests on all four VXI/VMEbus request levels, prioritizes
the requests, and grants the bus to the highest priority requester. As
VXI/VMEbus System Controller, the VXI/VMEpc 600 Series also drives
the 16 MHz VXI/VMEbus system clock by an onboard 16 MHz oscillator.
♦
VXIpc 600 Series Only—As required by the VXIbus specification, the
VXIpc 600 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 600
Series only receives the CLK10 signal.
VXIbus CLK10 Routing (VXIpc 600 Series Only)
When the VXIpc 600 Series is installed in Slot 0 of your mainframe, it
supplies the VXIbus CLK10 signal. The VXIpc 600 Series can use two
different sources to generate this signal: an onboard oscillator, or the
external CLK SMB connector. Use jumper W6 to select these options,
as shown in Figure 3-5.
Note
Figures 3-5 through 3-8 each highlight one jumper in a block of four jumpers.
The other three jumpers are grayed out to focus your attention to the specific
jumper.
Figure 3-5.
VXIbus CLK10 Routing
W4 W5 W6 W7
a. CLK10 Generated from
Onboard Oscillator
(Default)
b. CLK10 Generated
from SMB