User`s manual

X5-GSPS XMC Module
On the X5-GSPS module, both A/D channels operate synchronously using the same clock and trigger. The trigger controls
allows data to be acquired continuously, or during a specified time, as triggered by either a software or external trigger. Data
can also be decimated to reduce data rates.
Trigger Mode Data Collected/Played Back Start Trigger Stop Trigger
Continuous All enabled channel pairs Software or rising edge of
external trigger
Software or falling edge of
external trigger
Framed N sample points for each of
the enabled channel pairs
Software or rising edge of
external trigger
Stops when N samples are
collected back
Decimation M points are discarded for
every point kept. May be
used with either trigger
mode.
- -
Table 1: Trigger Modes
Figure 24. Analog Triggering Timing
As shown in the diagram, samples are captured when the sample clock and the trigger are true. The trigger is true in
continuous mode after a rising edge on the trigger input, software or external, until a falling edge is found. The trigger is timed
against the sample clock and may have a 0 to +1 A/D conversion clock uncertainty for an asynchronous trigger input.
Trigger Source
A software trigger or external trigger can be used by the trigger controls. Software trigger can always be used, but external
triggering must be selected. The trigger source is level-sensitive for the continuous mode or edge-triggered for the framed
mode triggering.
The Malibu software tools provide trigger source configuration and methods for software triggering, retriggering in framed
mode and trigger mode controls.
X5-GSPS User's Manual 82
Fs
Analog
Input
Trigger
Samples are acquired when trigger is true on
rising edges of Fs when trigger is true.