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

Figure 1. Hardware-based decoding quickly reveals serial communication

errors.

Figure 3. Automatic “Search &

Navigation” quickly finds user-

specified serial bus frames/bytes of

interest.

Figure 2. Symbolically decoding the CAN bus.

Hardware-Based Decoding

Keysight’s InfiniiVision Series oscilloscopes are the industry’s only

Keysight’s InfiniiVision Series oscilloscopes are the industry’s only

scopes to use hardware-based decoding. Most other vendor’s

scopes with serial bus triggering and protocol decode, use

software post-processing techniques to decode serial packets/

frames. With these software techniques, waveform- and decode-

update rates tend to be slow (sometimes seconds per update.)

That’s especially true when using deep memory, which is often

required to capture multiple packetized serial bus signals. And

when analyzing multiple serial buses simultaneously, software

techniques can make decode update rates even slower.

Faster decoding with hardware-based technology enhances

scope usability, and more importantly, the probability of

capturing infrequent serial communication errors. Figure 1 shows

an example of a Keysight InfiniiVision X-Series scope capturing

a random and infrequent CAN error frame. The upper half of the

scope’s display shows the decoded data in a “Lister” format,

along with a time-correlated decode trace shown below the

waveform.

Symbolic Trigger and Decode

With the DSOXT3AUTO, DSOX4AUTO or DSOX6AUTO option

licensed on a 3000T, 4000 or 6000 X-Series oscilloscope, you

can import a .dbc file that defines your multi-node CAN network.

The oscilloscope can then trigger on and decode the CAN bus

symbolically as shown in Figure 2. LIN symbolic trigger and

decode is also supported on the 3000T, 4000, and 6000 X-Series

oscilloscopes by importing an industry-standard .ldf file.

Automatic Search and Navigation

After capturing a long record of serial bus communication using

the InfiniiVision scope’s MegaZoom deep memory, you can

easily perform a search operation based on specific criteria

that you enter. Then, you can quickly navigate to bytes/frames

of serial data that satisfy the entered search criteria. Figure 3

shows an example of searching on captured I2C data to find all

occurrences of Read or Write operations with “No Ack.” In this

case, the scope found five occurrences of data transfers with “No

Ack,” and marked each occurrence with a white triangle to show

where in time they happened relative to the captured waveform.

Navigating and zooming-in on each marked byte/frame is quick

and easy using the scope’s front panel navigation keys. Search

and Navigation not available for DSOXT3CXPI/DSOX4CXPI.