I
2
C/SPI Triggering and Serial Decode 11
InfiniiVision 7000B Series Oscilloscopes User’s Guide 287
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.
4 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.
If don't care (0xXX) is selected for data, the data will be ignored.
The trigger will always occur on the 17th clock for 7- bit addressing
or 26th clock for 10-bit addressing.
c If you have selected a three- byte trigger, press the Data2 value softkey
and turn the Entry knob to select the 8- bit data pattern on which to
trigger.
To display I
2
C serial decode, see “I2C Serial Decode” on page 288.
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