User Manual

Protocol Analysis
R&S
®
Scope Rider RTH
170User Manual 1326.1578.02 ─ 08
8.2.3 I2C Trigger Settings
Access: "Bus" menu > "Bus Protocol" = "I2C" > "Trigger"
I2C Trigger
Selects the trigger type for I
2
C 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 fall-
ing edge of the SDA line.
"Restart"
Sets the trigger to a restart - when the start condition occurs without
previous stop condition. Restart 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 ris-
ing slope on SDA while SCL is high.
"No Ack (Missing 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 (Missing Ack) bits.
"Address"
Sets the trigger to one specific address pattern that is expected. The
trigger time is the falling clock edge of the acknowledge bit after the
address.
"Data"
Sets the trigger to a specified data pattern that is expected.
"Address and Data"
Sets the trigger to a combination of address and data condition.
Remote command:
TRIGger:I2C:MODE on page 377
I2C (Option R&S RTH-K1)