Device and RTSI Clocks

Many S Series device functions require a frequency timebase to generate the necessary timing signals for controlling A/D conversions, DAC updates, or general-purpose signals at the I/O connector. This timebase is also called the Master Timebase or Onboard Clock.

Most S Series devices can use either their internal 20MHzTimebase signal or a timebase received over the RTSI bus. The timebase can only be routed to or received from RTSI 7, or the RTSI clock. The device uses this clock source, whether local or from the RTSI bus, as the primary frequency source. If you configure the device to use the internal timebase, you also can program the device to drive its internal timebase over the RTSI bus to another device that is programmed to receive this timebase signal. The default configuration is to use the internal 20MHzTimebase signal without driving the timebase onto the RTSI bus.