17-2000 C
2020-09-17
23(50)
ADQ8-8C Manual
17-2000 C 2020-09-17
23(50)
However, in a high fan-out situation, where a trigger source has to drive many nodes, the load can be
too high. The trigger input can then be set in a high impedance mode and a bussed connection can be
used,
(a) an external source is driving the array of ADQ digitizers. In
(b) one of the ADQ digitizer is used as a master and is driving signals to the array of ADQ digitzers.One
has to be careful with the trigger distribution network to handle the reflections. If the trigger is periodic,
reflections are less critical and can be handled.
4.9 External trigger in the backplane
4.9.1
PXIe interface
There are an external trigger in the backplane of the PXIe version. The DSTAR signals are dedicated
matched trigger lines from the system timing slot. To use these triggers, a dedicated timing generation
board has to be used in the system timing slot. The TRIG bus is a general bus in the backplane which
can be used for triggering. The digitizer support connection to port 0 and port 1 of that bus.
The backplane trigger support both input and output triggers. These operations are independent and
can be used simultaneously.
Figure 14: Bussed connections
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