Chapter 3
Hardware Overview
©
National Instruments Corporation
3-9
NI PXI-6682 Series User Manual
Time-Synchronized Clock and Event Generation
The NI PXI-6682 Series is capable of generating clock signals and triggers
based on the synchronized time base. The NI PXI-6682 Series keeps an
internal time base with 10 ns resolution that can be synchronized to GPS,
IRIG-B, PPS, IEEE 1588, or freerunning. The NI Sync API allows you to
schedule triggers to occur at an arbitrary future time (future time events),
or clocks of arbitrary frequencies (with high and low times in multiples of
10ns). It is also possible to program the start and ending time of a clock
generated in this way.
Refer to Table 3-6 for a list of destinations for synchronized time clocks
and future-time events.
Routing Signals
The NI PXI-6682 Series has versatile trigger routing capabilities. It can
route signals to and from the front panel, the PXI star triggers, and
the PXI triggers. In addition, the polarity of the destination signal can be
inverted, which is useful when handling active-low digital signals.
The NI PXI-6682 also can route a 10 MHz clock from
CLKIN
to the PXI
10 MHz reference clock (the NI PXI-6682H does not have a CLKIN
connector). The NI PXI-6682 Series can route the TCXO, or PXI 10 MHz
reference clock to
CLKOUT
.
Figure 3-4 summarizes the routing features of the NI PXI-6682 Series.
The remainder of this chapter details the capabilities and constraints of
the routing architecture.
