04 | Keysight | Serial Bus Options for InfiniiVision X-Series Oscilloscopes - Data Sheet

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.

Multi-bus Analysis

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.

Using Segmented Memory to Capture

Multiple Serial Bus