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Serial bus analysis
R&S
®
RTB2000
231
User Manual 1333.1611.02 ─ 11
Trigger
The R&S
RTB2000 can trigger on various parts of I²C messages. The data and clock
lines must be connected to the input channels, triggering on math and reference wave-
forms is not possible.
You can trigger on:
●
Start or stop condition
●
Repeated start condition
●
Transfer direction (read or write)
●
Bytes with missing acknowledge bit
●
Specific slave address
●
Specific data pattern in the message
12.3.2
I²C configuration
The correct setup of the protocol parameters and the threshold is the condition for
decoding the signal.
To set up and decode an I²C signal
1. Press the [Protocol] key in the Analysis area of the front panel.
2. Select the bus that you want to use: B1 or B2.
3. Select the "Bus Type" = I2C.
4. Select "Configuration".
5. Select the "SCL", the channel to which the clock line is connected.
6. Select the "SDA", the channel to which the data line is connected.
7. Set the threshold. Use one of these methods:
● Tap "Find Threshold". The instrument evaluates the signal and sets the thresh-
old.
● Enter the threshold value in the numeric field.
8. In the "Bus" menu, enable "Decode".
I²C configuration settings
Figure 12-12: I2C setup dialog
I²C (option R&S
RTB-K1)