Protocol analysis
R&S
®
RTE
527User Manual 1326.1032.02 ─ 20
Make sure that:
●
In the [PROTOCOL] > "Decode" tab:
– The correct "Protocol" is selected.
– The data sources of the serial bus are channel signals.
●
In the "Trigger" > "Setup" tab:
– The trigger "Sequence" = "A only".
– The trigger "Source" = "Serial bus".
– The correct "Serial bus" is selected.
Serial bus
Selects the serial bus to be triggered on. Make sure to select the correct bus before
you enter the settings.
To trigger on a serial bus, the signals sources must be channel signals. If the data or
clock source is a math or reference waveform, you cannot trigger on that bus.
Remote command:
TRIGger<m>:SOURce:SBSelect on page 1425
Protocol
Defines the protocol type of the selected serial bus.
Remote command:
BUS<m>:TYPE on page 1420
Trigger type
Selects the trigger type for I²C analysis.
Some trigger types have additional settings that can be defined. In this case, the
"Define trigger details" button appears next to the "Type" function. Open it for a
detailed definition of the trigger conditions.
Remote command:
TRIGger<m>:I2C:MODE on page 1429
Start ← Trigger type
Sets the trigger to the start of the message. The start condition is a falling edge on
SDA while SCL is high. The trigger instant is the falling edge of the SDA line.
You can change the SDA and SCL lines here if necessary.
Repeated start ← Trigger type
Sets the trigger to a repeated start - when the start condition occurs without previous
stop condition. Repeated start conditions occur when a primary exchanges multiple
messages with a secondary without releasing the bus.
Stop ← Trigger type
Sets the trigger to the end of the message. The stop condition is a rising slope on SDA
while SCL is high.
I²C (option R&S
RTE-K1)
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