Protocol analysis
R&S
®
RTE
533User Manual 1326.1032.02 ─ 20
13.2.5 I²C decode results
When the configuration of the serial bus is complete, the signal can be decoded:
1. In the "Protocol" dialog > "Decode" tab, enable "Decode".
2. In the "Protocol" dialog > "Display" tab, select additional result display settings:
"Show decode table" and "Show binary signals".
For a description of the display settings, see also Chapter 13.1.3, "Display",
on page 515.
The instrument captures and decodes the signal according to the standard definition
and the configuration settings.
The color-coding of the various protocol sections and errors simplifies the interpretation
of the visual display. The decode information condenses or expands, depending on the
horizontal scale. Various data formats are available to show the result values.
Figure 13-4: Decoded and binary I2C signal, and decode results
green brackets [...] = start and end of frame
blue frame header = write frame ok, with transfer direction and address value
green frame header = read frame ok, with transfer direction and address value
yellow = address
blue = correct data
light orange = R/W bit
purple = acknowledge bit
red = No ack (missing acknowledge bit)
The signal in Figure 13-4 shows a write access followed by a read access, both with
10bit address. The decoded data shows a No Ack bit at the end of the read data. This
I²C (option R&S
RTE-K1)
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