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MSO9254A HOW TO INVERT A TRIGGER CONDITON ON A DATAWORD?

Question asked by ralfm on Dec 13, 2014
Latest reply on Dec 17, 2014 by algoss
Hi Guys,

i wonder if i can invert a trigger condition on a dataword to explore a data transmision looking for faults.

E.g.:
I attached the Scope to an SPI - Communication between two CPUs.
The CPUs (a and b)  are programmed to send allways exact one specific data from a to b and vice versa.

The test is running without interaction from outside - after some hours both CPUs are on halt due to wrong SPI-Data.

My idea was:
Setup the Trigger to Bus-Triggering and put in the data-word wich is permanently pinged between a and b  - AND THEN invert the trigger so that the scope just triggers in the case this data-word is not matching.

I can not find out how to do this.
Could it realy be that a 30000US $ Machine can not invert the trigger conditon?

I tried it with a second scope (the inputs are paralelled to the MSO) using the MSO's trigger output to trigger the other scope.
That works but is some how inefficient (2 scopes for that simple task..)

Does anybody has a better idea?

In my eyes this (inverting a trigger conditon) would be a very smart feature in generell!

Best regards.
Ralf  

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