© National Instruments | 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 Sample Clock
DO Waveform
Generation FIFO
DO.x Direction Control
Static DI
DI Sample Clock
DI Change
Detection
I/O Protection
Weak Pull-Down
P0.x
Static DO
Buffer
DI Waveform
Measurement
FIFO
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