Agilent Technologies 2000 X-Series User Manual page 317

4 Press the Trigger: softkey; then, turn the Entry knob to select the trigger
Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide
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.
SDA
SCL
Address
Start
Condition
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
Start or Control
byte
Restart
Condition
I2C/SPI Triggering and Serial Decode
Data
R/ Ack
Read
R/ Ack
Data
Trigger point
Stop
Ack
Condition
Ack
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