Keysight InfiniiVision HD3 Series - Page 334

334 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
26 I2C Triggering and Protocol Decode
• Address — triggers on the selected address. The R/W bit is ignored.
• Address with no Ack — The oscilloscope triggers when the acknowledge of the
selected address field is false. The R/W bit is ignored.
• Write Data with no Ack — Triggers if a write data byte is not acknowledged.
Note that this trigger mode will not trigger if the ack following the R/W bit is
missing, but will only trigger on missing acks following data bytes.
• Missing Acknowledge — Triggers when SDA data is high during any Ack SCL
clock bit.
• EEPROM Data Read — The trigger looks for EEPROM control byte value
1010xxx on the SDA line, followed by a Read bit and an Ack bit. It then looks
for the data value and qualifier set by the Data is and Data controls. When
this event occurs, the oscilloscope will trigger on the clock edge for the Ack
bit after the data byte. This data byte does not need to occur directly after
the control byte. The oscilloscope will trigger on any data byte that meets
the criteria defined by the Data is and Data controls during a current address
read or a random read or a sequential read cycle.
• Data is — Set the oscilloscope to trigger when data is = (equal to),
≠ (not
equal to), < (less than), or > (greater than) the data value set in the Data field.
• Frame (Start: Addr7: Read: Ack: Data) or Frame (Start: Addr7: Write: Ack: Data) —
The oscilloscope triggers on a read or write frame in 7-bit addressing mode
on the 17th clock edge if all bits in the pattern match. For triggering
purposes, a restart is treated as a start condition.
• Frame (Start: Addr7: Read: Ack: Data: Ack: Data2) or Frame (Start: Addr7: Write: Ack:
Data: Ack: Data2) — The oscilloscope triggers on a read or write frame in 7-bit
addressing mode on the 26th clock edge if all bits in the pattern match. For
triggering purposes, a restart is treated as a start condition.