Keysight Technologies DSO-X 2014A, User Manual

Page: 345 / 378

I2C/SPI Triggering and Serial Decode
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Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide 345
4 Press the Trigger: softkey; then, turn the Entry knob to select the trigger
condition:
• Start Condition — The oscilloscope triggers when SDA data transitions from
high to low while the SCL clock is high. For triggering purposes (including
frame triggers), a restart is treated as a start condition.
• Stop Condition — The oscilloscope triggers when data (SDA) transitions from
low to high while the clock (SCL) is high.
• Missing Acknowledge — The oscilloscope triggers when SDA data is high
during any Ack SCL clock bit.
• Address with no Ack — The oscilloscope triggers when the acknowledge of the
selected address field is false. The R/W bit is ignored.
• Restart — The oscilloscope triggers when another start condition occurs
before a stop condition.
• 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 softkey and the Data is softkey. 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.
SDA
SCL
Stop
Condition
R/ Start
Condition
Ack Ack
Data
Address
SDA
SCL
Control
byte
Read
R/ Ack
Data
Ack
Trigger point
Start or
Restart
Condition