Pxi Express Considerations; Pxi And Pxi Express Clock And Trigger Signals; Pxi Express; Pxie Daq Bandwidth Considerations - National Instruments PCIe-6323 User Manual

PXI Express Considerations

PXI clock and trigger signals are only available on PXI Express devices.

PXI and PXI Express Clock and Trigger Signals

Refer to the PXI_CLK10,
PXIe_DSTAR<A..C>, PXIe_CLK100, and
Routing and Clock Generation, for more information about PXI and PXI Express clock and
trigger signals.

PXI Express

PXI Express X Series devices can be installed in any PXI Express slot in PXI Express chassis.
PXI Express specifications are developed by the PXI System Alliance (

PXIe DAQ Bandwidth Considerations

In order to continuously transfer large amounts of data, the entire PXI Express system must be
designed with sufficient data bandwidth.
Depending on the PXI Express connection to the PXI Express chassis backplane, the bandwidth
bottleneck could be due to one of the following: the DAQ task, the backplane connection, a PCIe
switch integrated into the PXI Express backplane, or between the connection of a PXI Express
remote controller to a host machine (if using MXI).
Different PXI Express chassis have different architectures and per slot bandwidths.
If you are using a high channel count or high-speed MIO/SMIO DAQ device, pay special
attention to these factors since buffer overflow or underflow errors can occur as you approach
or pass the maximum theoretical system bandwidth.
Note (NI PXIe-6386/6396 Devices)
several ways from other SMIO devices. For more information about throughput
considerations for these devices, go to
smio14ms

USB DAQ Bandwidth Considerations

To transfer large amounts of data continuously, you must account for USB limitations. The
maximum theoretical bandwidth for USB 2.0 is 60 MB/s. Typical bandwidth to the host
computer from USB DAQ systems could produce lower speeds, depending on the application.
Tasks using multiple channels at higher sample rates may experience buffer overflow/underflow
errors.
PXI Triggers, PXI_STAR
.
Trigger, PXI_STAR
PXIe_SYNC100 sections of Chapter 9,
PXIe-6386 and PXIe-6396 devices differ in
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X Series User Manual
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