Agilent Technologies 54621A User Manual page 89

10-bit Write: the oscilloscope triggers on a 10-bit write frame on the 26th clock
edge if all bits in the pattern match. The frame is in the format:
Frame (Start: Address byte 1: Write: Address byte 2: Ack: Data)
For triggering purposes, a restart is treated as a start condition.
SDA
SCL
Address
Start or
1st byte
Restart
Condition
5 If you have set the oscilloscope to trigger on an EEPROM Data Read
condition:
Press the Data is softkey to 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 softkey.
The oscilloscope will trigger on the clock edge for the Ack bit after the trigger
event is found. 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 softkeys during a current address read or a
random read or a sequential read cycle.
Write
Address Ack2
Ack1
R/W
2nd byte
Triggering the Oscilloscope
To use I2C triggering
Data
Ack
Trigger point Condition
26th clock edge
Stop
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