Technical data

84 4000 X-Series Oscilloscopes Advanced Training Guide
4 Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
This particular frame should be interpreted as a Read (R) operation from
address 29 with an acknowledge (A), followed by a data byte equal to FF
with an acknowledge (A), following by a data byte equal to either 80 or C0
without an acknowledge (~A). Let’s now capture a very long stream of I
2
C
data and then manually search through the captured and decoded record.
22 Set the scope’s timebase to 20.00 ms/div.
23 Press the [Serial] front panel key; then tap the Lister softkey.
24 Press [Run/Stop] to stop repetitive acquisitions.
25 Tap the Scroll Lister softkey; then turn the Entry knob to manually scroll
through the lister table. You can also use the scroll bar to the right of
the lister.
As you scroll through the data, note that waveforms “track”. This means
that the frame that the arrow points to in the lister table corresponds to
the waveforms that are positioned at center- screen. If you want to zoom
in on a particular I
2
C frame, either push the Entry knob, or tap the Zoom
to Selection softkey. Let’s now perform an automatic search to find every
occurrence of a “Missing Acknowledge”. We will then automatically
navigate to each of these occurrences.
26 Push the horizontal position/delay knob to re- position the trigger point
back to center-screen.
27 Set the scope’s timebase to 20.00 ms/div.
28 Press the [Search] front panel key.
29 Tap the Search Edge softkey; then select Serial 1 (I
2
C).
30 Tap the Search for softkey; then select Missing Acknowledge as our search
criteria.