ADLINK PXI-7921 - Manual (Page 31)

Operation Theorem • 25
Figure 13: Available signal sources for Trigger Bus[7..0]
4.5 Star Trigger
The PXI specification defined 13 matched trigger lines to connect to the first 13
PXI peripheral slots on a PXI backplane. Users can route various trigger signal
to synchronize multiple PXI instruments and achieve tight timing control.
On ADLINK Switch Modules, the star trigger driver is disconnected from the PXI
backplane before users’ configuration. The maximum skew between each star
trigger line is controlled to within 1ns.
Note the reverse input voltage protection range is -0.5V to +5.5V. When the
local bus is used on peripheral modules, make sure that the voltage level is
compatible with ADLINK Switch Module.
Figure 10 illustrates the available signal destinations for Star Trigger. Signal
names in the solid-line boxes represent the external (physical) signal on
connectors, while signals in the dotted-line boxes represent the switch module’s
internal signal.
Trigger Bus[7..0]
WDT Overflow
SHDNn
Software Trigger
Star Trigger In
Trigger In Signal
Scanner Adv. Signal
AUX [3…2]