User`s guide

Triggering 4
InfiniiVision Oscilloscopes User’s Guide 117
• 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
Address
R/
Ack Data Ack
Stop
Condition
Start
Condition
SDA
SCL
Read
Ack
Ack
R/
Data
Trigger point
Start or
Restart Condition
Control byte