Features:
– I2S serial bus triggering
– I2S hardware-based protocol decoding
– User-selectable signal alignment selections
– Multiple triggering selections
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I S (Inter-IC Sound, or Integrated Interchip Sound), is an electrical serial bus interface
standard used for connecting digital audio devices together, such as compact disc,
digital audio tape, digital sound processors, and digital TV sound. Traditional methods
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of debugging serial busses such as I S includes manual bit counting. But this visual
technique of counting “1’s” and “0’s” can be tedious and prone to errors, especially
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since I S is typically formatted in a 2’s complement format.
Keysight Technologies, Inc. serial bus options for the InfiniiVision oscilloscopes
not only offers powerful triggering, but also provides unique hardware-accelerated
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decoding to help you debug audio designs with the I S bus faster. With the
industry’s fastest serial decode update rates, you can more easily find and debug
random and intermittent errors and signal integrity problems that you could easily
miss using other serial bus decode tools.
Other oscilloscope solutions with serial bus triggering and protocol decode typically
use software post-processing techniques to decode serial packets/frames. Using
these software techniques, waveform- and decode-update rates tend to be slow
(sometimes seconds per update), especially when you use deep memory, which is
often required to capture multiple packetized serial signals.
Figure 1 shows an example of decoding a stream of 2 channels of transmitted 8-bit
audio data based on standard WS/SCLK timing alignment. The trigger condition for
this example was set to synchronize on an “increasing” data value generated by
the left channel of digital transmission captured on channel-1 of the oscilloscope
(yellow trace).
Figure 1: An InfiniiVision series oscilloscope capturing and decoding 2 channels of
I2S audio data.
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KEYSIGHT [ Keysight Technologies ]
