The following figure shows the clock routing circuitry of the cDAQ chassis.

Figure 83. Clock Routing Circuitry

80 MHz Timebase

You can use the 80 MHz Timebase as the Source input to the 32-bit general-purpose counter/timers. The 80 MHz Timebase can be generated from the onboard oscillator.

20 MHz and 100 kHz Timebases

The 20 MHz and 100 kHz Timebases can be used to generate many of the analog input and analog output timing signals. They can function as the Source input to the 32-bit general-purpose counter/timers. The 20 MHz and 100 kHz Timebases are generated by dividing down the 80 MHz Timebase, as shown in the Clock Routing topic.

13.1072 MHz, 12.8 MHz, and 10 MHz Timebases

The 13.1072 MHz, 12.8 MHz, and 10 MHz Timebases can be used to generate many of the analog input and analog output timing signals. They can function as the Source input to the 32-bit general-purpose counter/timers. The 13.1072 MHz, 12.8 MHz, and 10 MHz Timebases are generated directly from the onboard clock generator.