VXIpc-486 Configuration and Installation
Chapter 2
VXIpc-486 Model 500 Series
2-8
© National Instruments Corporation
External CLK10
The W20 jumper configures the CLK SMB connector on the front panel. Keep the default
configuration shown in Figure 2-6(a) if the CLK connector is disconnected and used as neither
an input nor an output for the CLK10 signal. Figure 2-6(b) shows the configuration to use if you
want the CLK10 signal that appears on the backplane to also appear on the CLK SMB connector.
The configuration in Figure 2-6(c) is useful only if you have configured the W24 jumper to use
the external CLK10 input. In this setting, the signal supplied to the CLK SBM connector is
driven onto the VXIbus backplane as CLK10.
W26
P2
P1
W25
W24
W34
W33
W36
W35
W32
W20
J16
W20
a. Disabled*
* Factory Configuration
b. External
CLK10
Output
W20
W20
c. External
CLK10
Input
Figure 2-6. External CLK10 Settings
External CLK10 Termination
The J16 jumper configures whether the CLK10 signal is terminated. This is important only if
you are daisy-chaining the CLK10 signal among multiple chassis. The source of the CLK10 and
the last chassis in the daisy-chain should be terminated to prevent electrical reflections. Notice
that this option is useful only if you have selected the external CLK by jumpers W20 and W24.
W26
P2
P1
W25
W24
W34
W33
W36
W35
W32
W20
J16
J16
a. External
CLK10
Unterminated*
* Factory Configuration
b. External
CLK10
Terminated
J16
Figure 2-7. External CLK10 Termination Settings