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NOTE
Keysight U4301 PCIe Gen3 Analyzer User's Guide
then the filtering is considered Off and all the acquired data is stored in memory when the
trigger condition is met.
d Drag events you'd like to trigger on from the left-side pane to sequence steps in the Select the
Trigger(s) to use box.
The left-side pane contains an event hierarchy that can be expanded or collapsed. (This is the
same event hierarchy displayed in the simple trigger dialog.)
To edit events in the trigger box, click the event button.
To remove events from the trigger box, click the sequence step buttons.
e In the Select the Trigger(s) to use box, click buttons, make drop-down selections, and enter
values in fields to edit the steps in the trigger sequence:
•
The Step buttons let you insert or delete steps.
•
The If/Else if buttons let you insert or delete "if" clauses.
•
The event chevron buttons let you insert, delete, or logically group (or negate) events.
•
The direction drop-down listbox is displayed if you configured the U4301A/B module's
connection setup as a bidirectional setup. It lets you select the direction (upstream or
downstream) applicable for the trigger sequence. For a unidirectional data capture setup,
this listbox is not displayed.
•
The action chevron buttons let you insert or delete actions.
•
Use the Comment fields to document your advanced triggers.
f
Click Apply or OK.
Triggering on L1 Substates
In the Trigger dialog box, you can use the CLKREQ# event under the Physical Layer Triggers
group to set up a trigger on assertion, deassertion, or changes in the CLKREQ# signal.
To trigger on CLKREQ#, the Store CLKREQ# Transitions field must be set to Enabled.
When CLKREQ# is used as the trigger event, the U4301 module triggers on encountering the
CLKREQ# asserted/deasserted packet (as the case maybe as per the trigger condition). The
timestamp of this trigger is recorded and displayed as the time of the first PCIe packet seen
after sampling the CLKREQ# assertion. The following figure illustrates an example of
triggering on the deassertion of the CLKREQ# signal.
Setting Up Triggers
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