Chapter 6
Digital I/O
©
National Instruments
6-5
X Series User Manual
Digital Waveform Acquisition
Fig
u
re 6-2 s
u
mmarizes all of the timing options provided by the digital
inp
u
t timing engine.
Figure 6-2.
Digital Input Timing Options
Yo
u
can acq
u
ire digital waveforms on the Port 0 DIO lines. The DI
waveform acq
u
isition FIFO stores the digital samples. X Series devices
have a DMA controller dedicated to moving data from the DI waveform
acq
u
isition FIFO to system memory. The DAQ device samples the DIO
lines on each rising or falling edge of a clock signal, DI Sample Clock.
Yo
u
can config
u
re each DIO line to be an o
u
tp
u
t, a static inp
u
t, or a digital
waveform acq
u
isition inp
u
t.
X Series devices feat
u
re the following digital inp
u
t timing signals:
•
DI Sample Clock Signal
*
•
DI Sample Clock Timebase Signal
•
DI Start Trigger Signal
*
•
DI Reference Trigger Signal
*
•
DI Pause Trigger Signal
*
Signals with an
*
s
u
pport digital filtering. Refer to the
PFI Filters
section
of Chapter 8,
PFI
, for more information.
Revamp AO timing options with DI timebase and clocks
PFI, RT
S
I
PXI_
S
TAR
An
a
log Comp
a
ri
s
on
Event
20 MHz Time
bas
e
100 kHz Time
bas
e
PXI_CLK10
Progr
a
mm
ab
le
Clock
Divider
DI
Sa
mple Clock
Time
bas
e
PFI, RT
S
I
PXI_
S
TAR
An
a
log Comp
a
ri
s
on Event
Ctr
n
Intern
a
l O
u
tp
u
t
DI
Sa
mple Clock
100 MHz Time
bas
e
D
S
TAR <A..B>
D
S
TAR <A..B>
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
