Chapter 8
PFI
X Series User Manual
8-2
ni.com
When a terminal is
u
sed as a timing inp
u
t or o
u
tp
u
t signal, it is called PFI
x
(where
x
is an integer from 0 to 15). When a terminal is
u
sed as a static
digital inp
u
t or o
u
tp
u
t, it is called P1.
x
or P2.
x
. On the I/O connector, each
terminal is labeled PFI
x
/P1.
x
or PFI
x
/P2.
x
.
The voltage inp
u
t and o
u
tp
u
t levels and the c
u
rrent drive levels of the PFI
signals are listed in the specifications of yo
u
r device.
Using PFI Terminals as Timing Input Signals
Use PFI terminals to ro
u
te external timing signals to many different
X Series f
u
nctions. Each PFI terminal can be ro
u
ted to any of the following
signals:
•
(NI 632
x
/634
x
/6351/6353/6361/6363 Devices)
AI Convert Clock
(ai/ConvertClock)
•
AI Sample Clock (ai/SampleClock)
•
AI Start Trigger (ai/StartTrigger)
•
AI Reference Trigger (ai/ReferenceTrigger)
•
AI Pa
u
se Trigger (ai/Pa
u
seTrigger)
•
AI Sample Clock Timebase (ai/SampleClockTimebase)
•
AO Start Trigger (ao/StartTrigger)
•
AO Sample Clock (ao/SampleClock)
•
AO Sample Clock Timebase (ao/SampleClockTimebase)
•
AO Pa
u
se Trigger (ao/Pa
u
seTrigger)
•
Co
u
nter inp
u
t signals for all co
u
nters—So
u
rce, Gate, A
u
x, HW_Arm,
A, B, Z
•
Co
u
nter
n
Sample Clock
•
DI Sample Clock (di/SampleClock)
•
DI Sample Clock Timebase (di/SampleClockTimebase)
•
DI Reference Trigger (di/ReferenceTrigger)
•
DO Sample Clock (do/SampleClock)
Most f
u
nctions allow yo
u
to config
u
re the polarity of PFI inp
u
ts and
whether the inp
u
t is edge or level sensitive.
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