Chapter 3
VXIpc 800 Series Configuration and Installation
VXIpc 800/700 Series User Manual
3-6
©
National Instruments Corporation
Figure 3-3. VXIbus CLK10 Routing
The VXIpc-800 can also be configured to drive the external CLK SMB
signal from the VXIbus CLK10 signal. Switch S5 controls whether the
VXIpc-800 drives or receives the external CLK SMB signal. If you
change the S5 setting to drive CLK10 out the external CLK10 SMB
connector (Figure 3-4b), do not set S3 to source CLK10 to the
backplane from the SMB; instead use the setting shown in Figure 3-3a.
Figure 3-4. SMB CLK10 Direction
When switch S5 is set so that the VXIpc-800 receives the SMB CLK10
signal, you have the option to add a 50
Ω
termination to the signal by
setting switch S6. Switch S6 is unused—its setting does not matter—
when S5 is configured to drive the external CLK SMB signal.
Figure 3-5 shows the settings for switch S6.
S3
S3
S5
a. CLK10 Generated from Onboard
Oscillator (Default)
b. CLK10 Generated from SMB
S5
S5
a. CLK10 SMB Receives 10 MHz
Signal (Default)
b. CLK10 SMB Drives 10 MHz
Signal from VXIbus CLK10
