Chapter 9
Digital Routing and Clock Generation
©
National Instruments
9-9
X Series User Manual
Note that in a PXI chassis with more than eight slots, the PXI trigger lines
may be divided into m
u
ltiple independent b
u
ses. Refer to the
doc
u
mentation for yo
u
r chassis for details.
PXI_STAR Trigger
In a PXI Express system, the Star Trigger b
u
s implements a dedicated
trigger line between the system timing slot and the other peripheral slots.
The Star Trigger can be
u
sed to synchronize m
u
ltiple devices or to share a
common trigger signal among devices.
A Star Trigger controller can be installed in this system timing slot to
provide trigger signals to other peripheral mod
u
les. Systems that do not
req
u
ire this f
u
nctionality can install any standard peripheral mod
u
le in this
system timing slot.
An X Series device receives the Star Trigger signal (PXI_STAR) from a
Star Trigger controller. PXI_STAR can be
u
sed as an external so
u
rce for
many AI, AO, and co
u
nter signals.
An X Series device is not a Star Trigger controller. An X Series device can
be
u
sed in the system timing slot of a PXI system, b
u
t the system will not
be able to
u
se the Star Trigger feat
u
re.
PXI_STAR Filters
Yo
u
can enable a programmable debo
u
ncing filter on each PFI, RTSI,
PXIe-DSTAR, or PXI_STAR signal. Refer to the
PFI Filters
section of
Chapter 8,
PFI
,
for more information.
PXIe-DSTAR<A..C>
PXI Express devices can provide high-q
u
ality and high-freq
u
ency
point-to-point connections between each slot and a system timing slot.
These connections come in the form of three low-voltage differential star
triggers that create point-to-point, high-freq
u
ency connections between a
PXI Express system timing mod
u
le and a peripheral device. Using m
u
ltiple
connections enable yo
u
to create more applications beca
u
se of the
increased ro
u
ting capabilities.
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