I2C Triggering and Serial Decode
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Keysight InfiniiVision 1200 X-Series and EDUX1052A/G Oscilloscopes User's Guide
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Interpreting I2C Decode
• Angled waveforms show an active bus (inside a packet/frame).
• Mid-level blue lines show an idle bus.
• In the decoded hexadecimal data:
•
Address values appear at the start of a frame.
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Write addresses appear in light-blue along with the "W" character.
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Read addresses appear in yellow along with the "R" character.
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Restart addresses appear in green along with the "S" character.
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Data values appear in white.
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"A" indicates Ack (low), "~A" indicates No Ack (high).
•
Decoded text is truncated at the end of the associated frame when there is
insufficient space within frame boundaries.
• Pink vertical bars indicate you need to expand the horizontal scale (and run
again) to see decode.
• Red dots in the decode line indicate that more data can be displayed. Scroll or
expand the horizontal scale to view the data.
• Aliased bus values (undersampled or indeterminate) are drawn in pink.
