Slot 0 Configurations; Non-Slot 0 Configurations - National Instruments VXIpc-486 500 Series Getting Started

Chapter 2

Slot 0 Configurations

Configurations A through D from Table 2-2 are Slot 0 settings. Do not install the VXIpc-486 in
any other slot if you are using any of these four configuration options.
Warning: Installing a VXIpc-486 configured for Slot 0 operation into any slot other than
Slot 0 can damage the VXIpc-486, the backplane, and the Slot 0 device.
• Configuration A is the factory default mode of the VXIpc-486 Model 500 Series. Use this
mode when the VXIpc-486 is the Slot 0 device and does not need to use the external CLK10
SMB connector on the front panel to receive or send the CLK10 signal. In this configuration,
the onboard CLK10 reference (derived from an oscillator) source drives the differential ECL
CLK10 backplane signals, and the CLK10 is disabled. Use configurations B, C, or D if the
VXIpc-486 is the Slot 0 device and does need to use the external CLK10 connector.
• Configuration B is similar to A, except that the CLK10 SMB is driven with a TTL level
CLK10 derived from the ECL CLK10 driven on the backplane.
• In configuration C, the CLK10 SMB can be connected to a TTL CLK10 source to generate
the ECL CLK10 on the backplane.
• Configuration D is similar to C, except that the external CLK10 reference is terminated with
a 50 Ω resistor to ground.
The four Slot 0 settings are useful in multiple-mainframe configurations. For example, to
synchronize multiple mainframes together, you can use a VXIpc-486 as the clock source and
configure it to configuration B. Configure other Slot 0 controllers in other mainframes to
configuration C and connect the CLK10 SMBs together. The frames now have synchronized
CLK10 signals, which can be used in conjunction with the external trigger lines to synchronize
devices in multiple mainframes.

Non-Slot 0 Configurations

If you will be installing the VXIpc-486 Model 500 Series in any slot other than Slot 0, use either
configuration E or F from Table 2-2. As a Non-Slot 0 device, the VXIpc-486 accepts the CLK10
signal from the backplane.
• In configuration E, the VXIpc-486 Model 500 Series accepts the CLK10 signal from the
backplane, and terminates the differential ECL CLK10 signals with 50 Ω resistors to -2V.
• Configuration F is similar to E, except that the VXIpc-486 also drives the external CLK10
connector with a TTL CLK10 reference signal.
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VXIpc-486 Configuration and Installation
2-5 VXIpc-486 Model 500 Series