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ACE1553-3U-4 Hardware Manual
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4.1.1 Backplane Trigger Lines
If the user requires a trigger bus, PXI triggers can be routed over the backplane instead of
having to cable the cards together as one must do in a PC. The PXI backplane has eight
dedicated trigger lines that are routed on the backplane to every slot, including the system
controller slot. With these triggers, the user can achieve more sophisticated module
synchronization, with features such as one module triggering another and asynchronous
triggers. With asynchronous triggering, a module can be triggered by events occurring
elsewhere. Finally, trigger signals can be routed into and out of the chassis with many of the
newer controllers.
The ACE1553-3U-4 card can route its Trigger INPUTs and/or Trigger OUTPUTs to the PXI
backplane trigger lines, letting the user to deliver /receive trigger signals to/from other
PXI cards present in the system (a Trigger Controller, another AIM PXI-capable product).
Each Trigger Line can be assigned to any BC, RT or BM Trigger-Input or Trigger-Output
to use the advantage of already routed backplane trigger-lines instead of having to cable
the cards together as it must be done in a normal PC. A block diagram representing the
PXI I/O Trigger capabilities of the ACE1553-3U-4 is shown in Figure 4.2.
Please NOTE:
the PXI triggers on the backplane are ACTIVE LOW.
For electrical specification please refer to reference
The front-panel Trigger Outputs are always active, even if Trigger
Outputs are assigned and enabled on the PXI Trigger bus.
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