Chapter 3
Configuration and Installation
VXI/VMEpc 600 Series User Manual
3-8
©
National Instruments Corporation
The VXIpc 600 Series can also be configured to drive the external CLK10
SMB from the VXIbus CLK10 signal. Jumper W4 controls whether the
VXIpc 600 Series drives or receives the external CLK10 SMB. If you
change the W4 setting to drive CLK10 out the external CLK10 SMB
connector (Figure 3-6b), do not set W6 to source CLK10 to the backplane
from the SMB; instead use the setting shown in Figure 3-5a.
Figure 3-6.
SMB CLK10 Direction
When jumper W4 is set so that the VXIpc-650 receives the SMB CLK10
signal, you have the option to add a 50
Ω
termination to the signal by
setting W5. W5 is unused—its setting does not matter—when W4 is
configured to drive the external CLK SMB signal. Figure 3-7 shows the
settings for switch W5.
Figure 3-7.
SMB CLK10 Termination
a. CLK10 SMB Receives
10 MHz Signal (Default)
b. CLK10 SMB Drives 10 MHz
Signal from VXIbus CLK10
W4 W5 W6 W7
W4 W5 W6 W7
a. Does Not Terminate CLK10
SMB Input (Default)
b. Terminates
CLK10 SMB Input