Digital I/O - National Instruments PCIe-6323 User Manual

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.
Generation FIFO
DO Sample Clock
DO. x Direction Control
DI Sample Clock
The DIO terminals are named P0.<0..31> on the X Series device I/O connector.
Figure 6-1. X Series Digital I/O Circuitry
DO Waveform
Static DO
Buffer
Static DI
DI Waveform
Measurement
FIFO
DI Change
Detection
I/O Protection
Weak Pull-Down
Filter
© National Instruments | 6-1
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P0. x