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Basic Sequencing
Figure 3-1
A sequence is a sequential list of segments and may occur anywhere in the sequence
memory. A sequence may have a preamble of one or more segments that is played
once at the start of the sequence, but not repeated until the sequence is started again.
Waveforms are stored in dedicated banks of memory for channel 1 and channel 2.
The waveform playback of each channel is directly controlled by the sequencer. The
sequencer supplies the memory pointers necessary to create analog signals from the
digital data stored in memory. In addition, the sequencer provides the capability to
create sequences made of multiple waveform segments. This is helpful when
constructing long waveforms with repeating segments. A long waveform might
consist of repetitive data that can be stored as single segments and repeated in the
sequencer. This extends the waveform play time achievable with the available
memory.
Basic sequencing can be done using the software N8241A Control Utility GUI or
through the programmatic interfaces.
Example Sequence
Playback
There are two playback modes for basic sequencing:
•
Continuous
The sequence repeats indefinitely or until an event trigger is received.
•
Burst
The sequence is repeated a predefined number of times. This mode requires a
start trigger.
A total of 16,000 unique waveform sequences can be defined. Segments have a
minimum length of 128 samples and a granularity of 8 samples. A sequence must
contain at least two segments and can have up to the maximum number of 32768
Chapter 3
Theory of Operation
Waveform Playback
71
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