Agilent Technologies 1670E Series, Руководство пользователя

Страница: 330 / 650

330
Logic Analyzer Reference
The Analyzer Trigger Menu
Modifying the user macro
Before you begin building a trigger specification using the user macro,
it should be noted that in most cases one of the predefined trigger
macros will work.
If you need to accommodate a specific trigger condition, or you prefer
to construct a trigger specification from scratch, use the User macro as
a starting point. This macro 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 macro 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. From that point, it becomes an iterative
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.