I2C/SPI Triggering and Serial Decode 25
Agilent InfiniiVision 3000 X-Series Oscilloscopes User's Guide 381
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.
6 If you have set the oscilloscope to trigger on a 7- bit address read or
write frame condition or a 10-bit write frame condition:
a Press the Address softkey and turn the Entry knob to select the 7- bit
or 10- bit device address.
You can select from an address range of 0x00 to 0x7F (7- bit) or
0x3FF (10- bit) hexadecimal. When triggering on a read/write frame,
the oscilloscope will trigger after the start, address, read/write,
acknowledge, and data events occur.
If don't care is selected (0xXX or 0xXXX) for the address, the
address will be ignored. The trigger will always occur on the 17th
clock for 7- bit addressing or 26th clock for 10-bit addressing.
b Press the Data value softkey and turn the Entry knob to select the
8- bit data pattern on which to trigger.
You can select a data value in the range of 0x00 to 0xFF
(hexadecimal). The oscilloscope will trigger after the start, address,
read/write, acknowledge, and data events occur.
SCL
SDA
Stop
Condition
Start or
Restart
Condition
Trigger point
26th clock edge
Address
1st byte
R/
Ack1
Ack
Address
2nd byte
Write
Ack2
Data
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