13
decreased from thirteen to one on a PXI Express backplane. The remaining local bus line can
transmit analog or digital signals between modules.
Trigger Bus
Three trigger bus segments on the PXIe-62780 consist of a first segment from 1st to 6th
slots, a second from 7th to 12th slots, and a third from 13th to 18th slots, with each trigger
bus segment containing 8 trigger lines connecting all slots on the same segment, providing
inter-module synchronization. PXI and PXI Express modules can exchange trigger or
clock signals through the trigger bus, allowing precisely timed response to asynchronous
external events. Two trigger bus buffers can connect or disconnect the trigger lines of
adjacent segments.
As shown, eight combinations of trigger bus segment connections are possible between the
three bus segments, with any applicable to each of the eight trigger lines.
Figure 1-13: Trigger Bus Bridge Capability
