Chapter 3
Hardware Overview
3-12
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UPDATE* signal as an output on the I/O connector, the software can turn
on the output driver for the PFI5/UPDATE* pin.
Device and RTSI Clocks
Many functions performed by the NI 6052E 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.
The NI 6052E can use either its internal 20 MHz timebase or a timebase
received over the RTSI bus on the RTSI clock line. This timebase is
software configurable. If you configure the device to use the internal
timebase, you can program the device to drive its internal timebase over
the RTSI bus to another device programmed to receive this timebase signal.
This clock source, whether local or from the RTSI bus, is used directly by
the device as the primary frequency source. The default configuration is
to use the internal timebase without driving the RTSI bus timebase signal.
The NI PCI-6052E has separate connectors for the RTSI bus. The
NI PXI-6052E uses signals on the PXI backplane for the RTSI Clock.
The RTSI Clock signal uses the PXI trigger<7> line for this connection.
