When the waveforms to be generated are not known in advance, the “Memory Ping-
Pong” feature allows applications to update the contents of a waveform segment during
active signal generation and then switch execution glitch-free to this updated segment.
One segment is played in a loop until execution is switched to the updated segment.
The total number of update operations and switches and therefore the total playtime is
unlimited.
This example shows the “Memory Ping-Pong” using the simplest configuration:
Continuous (non-triggered) mode, ARBitrary (no sequences). It also works in triggered
mode and with sequences.
Preparation:
Set the continuous mode.
:INIT:CONT ON
Set sequencing mode to ARBitrary.
:FUNC:MODE ARB
Set dynamic mode.
:STAB:DYN ON
Create two waveform segments.
TRAC:DEF 1,1920
TRAC:DEF 2,1920
Create two sequence table entries referring to the waveform segments.
:STAB:DATA 0, 0,1,1,1,0, #hFFFFFFFF
:STAB:DATA 1, 0,1,1,2,0, #hFFFFFFFF
Load first segment with data.
:TRAC:DATA 1,0,#43840<data_bytes>
Select the waveform segment, that will be executed immediately after starting
the signal generation.
:TRAC:SEL 1
Start signal generation.
:INIT:IMM
Waveform update and switch operation in a loop until stopped by :ABOR command:
Reload data into next segment. The <segment_id> is either 1 or 2.
:TRAC:DATA <segment_id>,0,#43840<data-bytes>
Dynamically switch to reloaded segment The <sequence_table_index> is either
0 or 1.
:STAB:DYN:SEL <sequence_table_index>
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