User manual

Triggers
R&S
®
RTO
77User Manual 1316.0827.02 ─ 06
3.3.2 Trigger Qualification
By qualifying a trigger event, you can logically combine the trigger signal with the state
of other digital channel signals.
The instrument triggers if both of the following apply:
●
The basic conditions of the trigger event definition are fulfilled.
●
The logical conditions of the trigger qualification are true.
The A-event and B-event in a trigger sequence can have their own trigger qualification.
Qualification is not supported with slew rate, Data2Clock, and serial pattern trigger types.
►
To enable the qualification settings, select Qualify.
Example: Trigger on write access of a specific device of a bus system
In circuits using SPI, several slave devices use the same lines for reading and writing
data, and each slave has its own select line. To trigger on write access of specific slave,
the write line is the trigger source and the select line of the slave is set as qualifiying
condition.
Pattern
The pattern contains the channel selection, and the logical operations structure of hard-
ware based boolean logic.
"Channel"
Select the channels to be considered. For qualification, you can select
all channel signals except for the trigger source. In Pattern trigger setup,
the trigger source channel is selected by default, and you can select all
other channel signals.
"Coupling"
The current coupling or ground connection is shown for each channel
and can be changed directly in the pattern, if necessary.
"Boolean
operator"
Defines the logical operation on the digital signal resulting from the
comparison with the trigger level.
●
"Direct": leaves the input value unchanged
●
"NOT": inverts the input value
Reference for Triggers