Preliminary – ADLINK PXES-2780 User Manual
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Introduction
Local Bus
The local bus on a PXI backplane is a daisy-chained bus that
connects each peripheral slot with adjacent peripheral slots to
the left and right. The quantity of local bus lines is decreased
from thirteen to one on a PXI Express backplane. The remain-
ing local bus line can transmit analog or digital signals between
modules.
Trigger Bus
Three trigger bus segments on the PXES-2780 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 seg-
ment 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 sig-
nals 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 connec-
tions are possible between the three bus segments, with any
applicable to each of the eight trigger lines.
PRELIMINARY