Serial bus analysis
R&S
®
RTM3000
272User Manual 1335.9090.02 ─ 09
Remote command:
CHANnel<m>:THReshold on page 440
CHANnel<m>:THReshold:FINDlevel on page 441
DIGital<m>:THReshold on page 770
13.3.3 I²C trigger
Before you set up the trigger, make sure that the bus is configured correctly. See
Chapter 13.3.2, "I²C configuration", on page 270.
To trigger on I²C signals:
1. Press the [Protocol] key in the Analysis area of the front panel.
2. Select the bus that is configured for I2C.
3. Select "Trigger".
This selection has several effects:
● Enables decoding, if necessary.
● Sets the "Trigger Type" to "Serial Bus" and the trigger source to the selected
bus.
● Displays the trigger conditions in the dialog box, below the protocol setup.
4. At "I2C Trigger", select the required trigger type:
● "Start": beginning of the message
● "Stop": end of the message
● "Restart": repeated start condition
● "No Ack (Missing Ack)": transfer of data bits is not acknowledged
● "Address and Data": address pattern and/or up to 3 data bytes
5.
If "Address and Data" is selected, the I
2
C trigger setup dialog expands to define the
serial patterns.
I2C trigger settings
Figure 13-13: Trigger setup dialog to trigger on a combination of address and data
I²C (option R&S RTM-K1)
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