Protocol Analysis
R&S
®
Scope Rider RTH
184User Manual 1326.1578.02 ─ 12
"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 428
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.
"Data Read NACK"
Marks the end of the read process when the master reads data from
the slave. This Nack is sent according to the protocol definition, it is
not an error.
"Data Write NACK"
The addressed slave does not accept the written data.
Remote command:
TRIGger:I2C:ADNack on page 428
TRIGger:I2C:DRNack on page 428
TRIGger:I2C:DWNack on page 428
Address Pattern
Specifies the address pattern to be found, in binary or hex format. Enter the pattern in
MSB first bit order.
See also Chapter 3.6.12.1, "Pattern Definition", on page 70.
Remote command:
TRIGger:I2C:ADDRess on page 429
I2C (Option R&S
RTH-K1)
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