Teledyne LeCroy USBTracer_Trainer - Users Manual - Manual (Page 274)

Chapter 10: Recording Options USB Protocol Suite User Manual
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Within actions, counters determine how many times the system calls the action before it
acts. Action counters typically have two properties:
•
Random: Can be set to “Yes” or “No” (default value is “No”). If set to “Yes”, the
action triggers a number of occurrences before the action takes place. That number
ranges randomly between 1 and the value set in the property At least every Nth
occurrence, which replaces the property Every Nth occurrence when “Yes” is
selected.
• Every Nth occurrence: Number of times the system calls the action before it acts.
Note that there is some overlap in the way these counters can be used. For example, in
the simple case of a single event leading to a single action, it makes no difference
whether you specify the event to require five repeats before triggering the action, or the
action to require five occurrences before it acts.
However, in the case of combined events and/or actions, the separate counters provide
flexibility in designing test cases. For example, consider the case where Event_1 OR
Event_2 leads to Action. If Event_1 has a counter of 5, then the Action triggers either
when Event_1 has repeated five times or when Event_2 happens the first time,
whichever occurs first.
But if the event counters are set to 1 and the Action counter is set to 5, then the Action
happens after five occurrences of EITHER Event_1 or Event_2.
Number of Analyzer Counters and Timers
The Analyzer includes one event counter and one time counter (timer). If you try to assign
more, you get a warning.
Packets
You must assign a packet, event, or logical expression to a counter and/or timer.
Using a Counter
To use a counter:
Step 1 Click an event to display an arrow.
Step 2 Click a counter. This causes the counter to attach itself to the bottom of the event.
An arrow automatically connects the counter to the Trigger button.
Note: For Timers, do NOT use a timer as the first event in a sequence, since this
first “event” will be the start of recording, and this is not a precise or
predictable point in time from which to start timing. Use timers only AFTER
the first event.
Setting a Counter
To set a counter:
Step 1 Open the Recording Rules page, select an event, and drag it to the Global State
or Sequence cell.
Step 2 Counts can only be set on a per channel basis, so press the Up or Down channel
buttons to select the channel on which the count is performed.
Step 3 Right-click the selected event and select Add Counter from the menu to open
the Properties dialog.
Step 4 In the text box to the right of the label Count, enter a value. Make sure the
checkbox to the left of the word Count is checked.
Step 5 Click the X in the top right corner of the dialog box to close the dialog. A counter
button should appear just below your selected event.