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Logic Analyzer Reference
The Analyzer Trigger Menu
Modifying the user function
Before you begin building a trigger specification using the user
function, it should be noted that in most cases one of the predefined
trigger functions will work.
If you need to accommodate a specific trigger condition, or you prefer
to construct a trigger specification from scratch, use the User function
as a starting point. This function appears in long form, which means it
has the analyzer’s total flexibility available in terms of resource terms,
global timers, occurrence counters, duration counters, and two-way
branching.
The User function has a "fill-in-the-blanks" type statement. You have
the following elements to use:
•Bit Patterns, Ranges, and Edges
•Storage Qualification
•< and > Durations
•Occurrence Counters
•Timers
•Branching
A typical method used during a debug operation is to first trigger on a
known pattern, edge or range. Fro m that point, it becomes an iterativ e
process of adding more levels to further filter the data. It is important
for you to know how to use such elements as occurrence counters,
timers, and branching, to zero in and trigger at the desired point.