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C/SPI Triggering and Serial Decode 11
InfiniiVision 7000B Series Oscilloscopes User’s Guide 285
• 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.
• Frame (Start: Addr7: Read: Ack: Data) or Frame (Start: Addr7: Write: Ack: Data)
— The oscilloscope triggers on a read or write frame in 7-bit
addressing mode on the 17th clock edge if all bits in the pattern
match. For triggering purposes, a restart is treated as a start
condition.
Read
Ack
Ack
R/
Data
Trigger point
Start or
Restart Condition
Control byte
Start or
Restart
Condition
Trigger point
17th clock edge
Address
Read
Write
R/
Ack
Data
Ack
Stop
Condition
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