Chapter 3 Configuration and Installation
VXIpc-850 Series User Manual
3 - 6
© National Instruments Corporation
S3
S3
S5
a. CLK10 Generated from Onboard
Oscillator (Default)
b. CLK10 Generated from SMB
Figure 3-3. VXIbus CLK10 Routing
The VXIpc-850 can also be configured to drive the external CLK SMB
signal from the VXIbus CLK10 signal. Switch S5 controls whether the
VXIpc-850 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.
S5
S5
a. CLK10 SMB Receives 10 MHz
Signal (Default)
b. CLK10 SMB Drives 10 MHz
Signal from VXIbus CLK10
Figure 3-4. SMB CLK10 Direction
When switch S5 is set so that the VXIpc -850 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.