User manual

Protocol Analysis
R&S
®
Scope Rider RTH
124User Manual 1326.1578.02 ─ 04
I2C Trigger
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 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
I2C Trigger Settings.
"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.
No Ack (Missing Ack)
Selects which missing acknowledge bits is detected if the trigger type is set to "No Ack
(Missing Ack)".
"Address NACK"
No slave recognizes the address.
I2C (Option R&S RTH-K1)