2-14
Functional Description
Figure 2-4. Enabling Conversions with a Hardware Trigger
Pre-Trigger Acquisition
In pre-trigger acquisition, the data of interest appears before a specific
digital trigger. Acquisition starts on an internal, analog, or digital trigger
event and continues until the digital trigger. Pre-trigger acquisition is
available with DMA-mode operations only.
About-Trigger Acquisition
In about-trigger acquisition, the data of interest appears both before and
after a specific digital trigger. Acquisition starts on an internal, analog, or
digital trigger and continues until a specified number of samples has been
acquired after the digital trigger. About-trigger acquisition is available
with DMA-mode operations only.
Conversions begin with
external source (programmed
for negative edge)
idle state
count
count
count
count
Conversions begin with
internal clock source
Internal clock
source
External clock
source
Trigger occurs (on positive edge)
TGOUT output
TGIN input
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