RIGOL Chapter 5 Trigger
5-40 MSO4000/DS4000 User’s Guide
― press Direction and turn the multi-function knob to select “Read”,
“Write” or “R/W”. You can also press Direction continuously to switch
the current data direction.
Note: When the address bits is set to "8 bit", you do not need to set
the data direction.
Data: the trigger searches for the control byte value on the data line (SDA)
following which there is a reading bit and an acknowledgement bit; then,
the trigger searches for the specified data value. When this event occurs,
the oscilloscope will trigger on the clock edge of the acknowledgement bit
behind the data byte.
When this trigger condition is selected, the current data information is
displayed at the bottom of the screen, as shown in the figure below. The bit
currently selected is highlighted in red. When the data parameter is
modified, the data information changes accordingly.
Set the data parameters:
― press Byte Length and turn the multi-function knob to set the
byte length to 1, 2, 3, 4 or 5.
― press CurrentBit and turn the multi-function knob to select the
bit to be operated.
The range of the current bit is related to the “Byte Length” setting.
When the byte length is set to 1, 2, 3, 4 and 5, the ranges of the
current bit is 0 to 7, 0 to 15, 0 to 23, 0 to 31 and 0 to 39 respectively.
― press Data to set the data pattern of the current data bit to H, L or X.
You can also switch the data pattern of the current data bit by pressing
the multi-function knob
continuously after you set the
CurrentBit.
― press AllBits to set the data patterns of all the data bits to the data
pattern of the current bit (namely the pattern set in Data).
A&D: search for the specified address and data and trigger when the
address and data conditions are met at the same time.
When this trigger condition is selected, the current data information is
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