Chapter 3 81
Theory of Operation
Waveform Playback
Triggers 1,2,3,4
These four trigger inputs can be used to control waveforms in the sequencer.
Hardware trigger inputs may be configured to generate events on the rising or
falling SYNC clock edges, but not both at the same time. The trigger threshold can
be set between –4.5 and +4.5V. Ports 1 and 2 have a common threshold, and ports 3
an 4 have a common threshold. These two common thresholds are not shared and
can be set independently.
Trigger delays can be set in increments of the SYNC clock (0-255 clocks).
These trigger inputs can be configured to initiate the following events through the
software Control Utility:
Start starts playback at the beginning of the waveform
Hold holds at the end of the waveform
Stop stops playback
Resume resumes playback at the point in the waveform that play was
held or stopped
The Waveform Advance, Scenario Advance, Waveform Jump, and Scenario Jump
triggers are only available through the programatic interfaces.
LXI T1
These trigger inputs can be configured to the following:
LAN 0-7 provides a way to trigger programmatically over a LAN line
LXI 0-7 the LXI Trigger Bus enables event driven functionality over an
eight channel multipoint LVDS system that can simultaneously
transmit and receive signals
Trigger In direct trigger
NOTE To achieve the specified performance, use front panel triggers 1, 2, 3, or 4. Triggers
over the Trigger In and LXI Trigger Bus will have more latency than what is
specified for Triggers 1-4. Triggers over the LAN will experience the most latency.
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