National Instruments PXI-7842, User Manual

Page: 12 / 71

Chapter 1 Introduction
R Series Multifunction RIO User Manual 1-2 ni.com
instr
u
ment (VI) to the FPGA. Using the FPGA Mod
u
le, yo
u
can
graphically design the timing and f
u
nctionality of the R Series device.
If yo
u
only have LabVIEW b
u
t not the FPGA Mod
u
le, yo
u
cannot create
new FPGA VIs, b
u
t yo
u
can create VIs that r
u
n on Windows or a LabVIEW
Real-Time (RT) target to control existing FPGA VIs.
Some applications req
u
ire tasks s
u
ch as real-time, floating-point
processing or datalogging while performing I/O and logic on the R Series
device. Yo
u
can
u
se the LabVIEW Real-Time Mod
u
le to perform these
additional applications while comm
u
nicating with and controlling the
R Series device.
The R Series device contains Flash memory to store a start
u
p VI for
a
u
tomatic loading of the FPGA when the system is powered on.
The NI 78 xx R
u
ses the Real-Time System Integration (RTSI) b
u
s to easily
synchronize several meas
u
rement f
u
nctions to a common trigger or timing
event. R Series PCI devices access the RTSI b
u
s thro
u
gh a RTSI cable
connected between devices. R Series PXI devices access the RTSI b
u
s
thro
u
gh the PXI trigger lines implemented on the PXI backplane.
Refer to the NI R Series Multifunction RIO Specifications , available at
ni.com/manual
s
, for detailed device specifications.
Using PXI with CompactPCI
Using PXI-compatible prod
u
cts with standard CompactPCI prod
u
cts is an
important feat
u
re provided by PXI Hardware Specification Revision 2.1
and PXI Software Specification Revision 2.1 . If yo
u u
se a PXI-compatible
pl
u
g-in card in a standard CompactPCI chassis, yo
u
cannot
u
se
PXI-specific f
u
nctions, b
u
t yo
u
still can
u
se the basic pl
u
g-in card
f
u
nctions. For example, the RTSI b
u
s on the R Series device is available
in a PXI chassis b
u
t not in a CompactPCI chassis.
The CompactPCI specification permits vendors to develop s
u
b-b
u
ses that
coexist with the basic PCI interface on the CompactPCI b
u
s. Compatible
operation is not g
u
aranteed between CompactPCI devices with different
s
u
b-b
u
ses nor between CompactPCI devices with s
u
b-b
u
ses and PXI.
The standard implementation for CompactPCI does not incl
u
de these
s
u
b-b
u
ses. The R Series device works in any standard CompactPCI chassis
adhering to the PICMG CompactPCI 2.0 R3.0 core specification.