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Chapter 3
Acquiring Analog Input
Using a Digital Source
To use a digital source as the AI Reference Trigger, specify a source and an edge. The source
can be any of the following signals:
•
PFI <0, 1>
•
PXI_Trig <0..7>
•
PXI_STAR
•
PXIe_DSTAR <A, B>
The source can also be one of several other internal signals on your DAQ device. Refer to
Device
Routing in MAX
in the
NI-DAQmx Help
or the
LabVIEW Help
for more information.
Routing AI Pause Trigger Signal to an Output Terminal
You can route the AI Pause Trigger out to any PXI_Trig <0..7>, PXI_STAR, or PXIe_DSTARC
terminal.
Note
Pause triggers are only sensitive to the level of the source, not the edge.
Clock Generation and Routing
The clock generation and routing circuity creates the main timing signals for your PXIe-4310
module. All internally generated analog input timing signals are derived from these main timing
signals. The clock generation and routing subsystem also allows you to synchronize the clocking
of multiple measurement devices in a PXI Express chassis. Figure 3-8 summarizes the functions
of the clock generation and routing subsystem.
Figure 3-8.
External Clock Reference
Extern
a
l
Reference
Clock
÷
200
Onbo
a
rd
100 MHz
O
s
cill
a
tor
PLL
÷
5
÷
10
PXI_Trig <0..7>
PXIe_CLK100
PXI_
S
TAR
PFI<0, 1>
PXIe_D
S
TAR<A,B>
10 MHz RefClk
(To PXI_Trig <0..7>
O
u
tp
u
t
S
elector
s
)
100 MHz
Timeb
as
e
20 MHz
Timeb
as
e
100 kHz
Timeb
as
e
