Chapter 9
Digital Routing and Clock Generation
9-8
ni.com
Refer to the KnowledgeBase document,
Digital Filtering with M Series
and CompactDAQ
, for more information about digital filters and counters.
To access this KnowledgeBase, go to
ni.com/info
and enter the info
code
rddfms
.
PXI Clock and Trigger Signals
(NI 6124 Only)
PXI clock and trigger signals are only available on PXI and
PXI Express devices.
PXI_CLK10
(NI 6124 Only)
PXI_CLK10 is a common low-skew 10 MHz reference clock
for synchronization of multiple modules in a PXI measurement or control
system. The PXI backplane is responsible for generating PXI_CLK10
independently to each peripheral slot in a PXI chassis.
PXI Triggers
(NI 6124 Only)
A PXI chassis provides eight bused trigger lines to each
module in a system. Triggers may be passed from one module to another,
allowing precisely timed responses to asynchronous external events that
are being monitored or controlled. Triggers can be used to synchronize the
operation of several different PXI peripheral modules.
On S Series devices, the eight PXI trigger signals are synonymous with
RTSI <0..7>.
Note that in a PXI chassis with more than eight slots, the PXI trigger lines
may be divided into multiple independent buses. Refer to the
documentation for your chassis for details.
PXI_STAR Trigger
(NI 6124 Only)
In a PXI system, the Star Trigger bus implements a dedicated
trigger line between the first peripheral slot (adjacent to the system slot)
and the other peripheral slots. The Star Trigger can be used to synchronize
multiple devices or to share a common trigger signal among devices.
A Star Trigger controller can be installed in this first peripheral slot to
provide trigger signals to other peripheral modules. Systems that do not
require this functionality can install any standard peripheral module in this
first peripheral slot.
