04 | Keysight | Serial Bus Options for InfiniiVision X-Series Oscilloscopes - Data Sheet
Multi-bus Analysis
Using Segmented Memory to Capture
Multiple Serial Bus
Figure 4. An interleaved “Lister” makes it easier to time-correlate activity
between two decoded serial buses.
Figure 5. Segmented memory acquisition selectively captures more
packets/bytes of serial bus activity.
Many of today’s designs include multiple serial buses. Sometimes
it may be necessary to correlate data from one serial bus to
another. Keysight’s InfiniiVision 3000, 4000 and 6000 X-Series
oscilloscopes can decode two serial buses simultaneously using
hardware-based decoding. Plus they are the only scopes on
the market that can also display the captured data in a time-
interleaved “Lister” display, as shown in Figure 4. In this particular
example, the scope has simultaneously decoded and interleaved
a CAN and LIN bus in an automotive system.
PacketsThe segmented memory option for Keysight’s InfiniiVision
X-Series oscilloscopes (standard in 3000T, 4000 and 6000
X-Series) can optimize your scope’s memory, letting you
capture more packets/frames of serial bus activity. Segmented
memory acquisition optimizes the number of packetized serial
communication frames that can be captured consecutively.
Segmented memory does this by capturing just the selective
frames/bytes of interest while ignoring (not digitizing) idle time
and other unimportant frames/bytes. Figure 5 shows an example
of the oscilloscope capturing 500 consecutive hi-speed USB split
packets for a total acquisition time of approximately
200 ms. Capturing this much data using conventional
oscilloscope acquisition memory would require 1G bytes of
memory.
Keysight’s InfiniiVision X-Series oscilloscopes are the only
scopes on the market today that can acquire segments on up
to four analog channels of acquisition, and time-correlated
segments on digital channels (using an MSO model), along with
automatic hardware-based serial bus decoding for each segment.
In addition, you can use the scope’s Search and Navigation
capability after a segmented memory acquisition has been
performed.
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