User manual

Protocol Analysis
R&S
®
RTO
262User Manual 1316.0827.02 ─ 06
Make sure that:
●
the trigger sequence is set to "A only"
●
the trigger source is "Serial bus", and the data source(s) of the bus are channel signals
●
the correct serial bus is selected
●
the correct protocol is selected
Trigger type
Selects the trigger type for I²C analysis.
"Start"
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"
Sets the trigger to a repeated start - when the start condition occurs
without previous stop condition. Repeated start conditions occur when
a master exchanges multiple messages with a slave without releasing
the bus.
"Stop"
Sets the trigger to the end of the message. The stop condition is a rising
slope on SDA while SCL is high.
"No Ack (Miss-
ing Ack)"
Missing acknowledge bit: the instrument triggers if the data line remains
HIGH during the clock pulse following a transmitted byte. You can also
localize specific missing acknowledge bits by setting the No Ack con-
ditions.
"Address"
Sets the trigger to one specific address condition or a combination of
address conditions. The trigger time is the falling clock edge of the
acknowledge bit after the address.
●
Address type
●
Specified address or address range
●
Read/Write bit
Description of trigger type specific settings: "Address
setup" on page 263.
I²C