© National Instruments
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6-1
6
Digital I/O
X Series devices contain up to 32 lines of bidirectional DIO signals on Port 0. In addition,
X Series devices have up to 16 PFI signals that can function as static DIO signals.
X Series devices support the following DIO features on Port 0:
•
Up to 32 lines of DIO
•
Direction and function of each terminal individually controllable
•
Static digital input and output
•
High-speed digital waveform generation
•
High-speed digital waveform acquisition
•
DI change detection trigger/interrupt
Figure 6-1 shows the circuitry of one DIO line. Each DIO line is similar. The following sections
provide information about the various parts of the DIO circuit.
Figure 6-1.
X Series Digital I/O Circuitry
The DIO terminals are named P0.<0..31> on the X Series device I/O connector.
DO
Sa
mple Clock
DO W
a
veform
Gener
a
tion FIFO
DO.
x
Direction Control
S
t
a
tic DI
DI
Sa
mple Clock
DI Ch
a
nge
Detection
I/O Protection
We
a
k P
u
ll-Down
P0.
x
S
t
a
tic DO
B
u
ffer
DI W
a
veform
Me
asu
rement
FIFO
Filter
Summary of Contents for DAQ X NI 634 Series
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