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In addition to viewing the I S decoded strings time-correlated to the captured
waveforms, you can also select to view multiple packets in a tabular format
using the scope’s protocol lister display mode. And with Keysight’s 7000B Series
oscilloscopes, you can also easily search and navigate within the lister to find and
mark particular events of interest with direct time-correlation to the waveform
display. In the example shown in Figure 2, an “error” search condition was setup. In
this case, the scope found three words that contain errors over a 25 ms time span.
Figure 2. Viewing I2S decoded words in the protocol lister display along with automatic
search and navigation.
Segmented Memory acquisition captures and stores serial bus
data packets
The Segmented Memory acquisition option (Option LMT) for Keysight’s InfiniiVision
Series oscilloscopes can optimize your scope’s acquisition memory, allowing
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you to capture more I S packets of data while using less memory. Segmented
memory acquisition optimizes the number of serial packets that can be captured
consecutively by selectively ignoring (not digitizing) unimportant idle time or
unimportant packets of data. And with a minimum 250 picoseconds time-tagging
resolution, you will know the precise time between each captured word.
Figure 3 shows an example of capturing consecutive occurrences of a “left”
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channel word with a decimal value of +39 using a specific I S trigger setup to
capture this condition. The scope easily captures 2000 consecutive occurrences of
this word for a total acquisition time of over 600 ms. After acquiring these 2000 I²S
words, we can then scroll through all words individually to look for any anomalies or
errors.
Figure 3. Segmented Memory acquisition captures up to 2000 consecutive packets of data
with precise time-tagging.
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