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Glossary
© National Instruments Corporation
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P
PCI
peripheral component interconnect—a high-performance expansion bus
architecture originally developed by Intel to replace ISA and EISA. It is
achieving widespread acceptance as a standard for PCs and work-stations;
it offers a theoretical maximum transfer rate of 132 Mbytes/s.
architecture originally developed by Intel to replace ISA and EISA. It is
achieving widespread acceptance as a standard for PCs and work-stations;
it offers a theoretical maximum transfer rate of 132 Mbytes/s.
PCI Express
peripheral component interconnect express—a high-performance
expansion bus architecture that expands on and doubles the data transfer
rates of original PCI. PCI Express is a two-way, serial connection that
carries data in packets along two pairs of point-to-point data lanes,
compared to the single parallel data bus of traditional PCI that routes data
at a set rate. Initial bit rates for PCI Express reach 2.5Gb/s per lane
direction, which equate to data transfer rates of approximately
200 Mbytes/s.
expansion bus architecture that expands on and doubles the data transfer
rates of original PCI. PCI Express is a two-way, serial connection that
carries data in packets along two pairs of point-to-point data lanes,
compared to the single parallel data bus of traditional PCI that routes data
at a set rate. Initial bit rates for PCI Express reach 2.5Gb/s per lane
direction, which equate to data transfer rates of approximately
200 Mbytes/s.
PFI
programmable function interface
PLL
phase-locked loop
precision
The measure of the stability of an instrument and its capability to give the
same measurement over and over again for the same input signal.
same measurement over and over again for the same input signal.
propagation delay
The amount of time required for a signal to pass through a circuit.
PXI
A rugged, open system for modular instrumentation based on CompactPCI,
with special mechanical, electrical, and software features. The PXIbus
standard was originally developed by National Instruments in 1997, and
is now managed by the PXIbus Systems Alliance.
with special mechanical, electrical, and software features. The PXIbus
standard was originally developed by National Instruments in 1997, and
is now managed by the PXIbus Systems Alliance.
PXI Express
An open system for modular instrumentation based on PXI and
CompactPCI Express. PXI Express enhances system timing and software
frameworks while preserving backward compatibility with PXI. The
system controller slot is capable of supporting up to a x16 PCI Express link,
plus a x8 link, providing a total of 6 GB/s bandwidth to the PXI backplane,
which is more than 45 times improvement upon PXI backplane throughput
CompactPCI Express. PXI Express enhances system timing and software
frameworks while preserving backward compatibility with PXI. The
system controller slot is capable of supporting up to a x16 PCI Express link,
plus a x8 link, providing a total of 6 GB/s bandwidth to the PXI backplane,
which is more than 45 times improvement upon PXI backplane throughput
PXI star
A special set of trigger lines in the PXI backplane for high-accuracy device
synchronization with minimal latencies on each PXI slot.
synchronization with minimal latencies on each PXI slot.
PXI_Trig/PXI_Star
synchronization clock
synchronization clock
The clock signal that is used to synchronize the PXI triggers or PXI_STAR
triggers on an NI PXIe-6672.
triggers on an NI PXIe-6672.