Trigger Sequence Levels - HP 16550A User Reference

100-mhz state/500-mhz timing logic analyzer
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Trigger Sequence Levels
Sequence levels are the definable stages of the total trigger
specification. When defined, sequence levels control what the
analyzer triggers on, when the analyzer triggers, and where trigger will
be located in the total block of acquired data. In addition, you can
qualify what data is stored when trigger occurs.
By using sequence levels, you create a sequence of instructions for the
analyzer to follow. As the sequence levels are executed, all
subsequent branching and sequence flow is directed by the
statements within the sequence levels. The path taken resembles a
flow chart, and the end result is the desired trigger point.
Individual sequence levels are assigned either a pre-defined trigger
macro, or a User-level trigger macro. The total trigger specification,
(one or more sequence levels) can contain pre-defined macros,
User-level macros, or a combination of both. You finish defining each
level by inserting resource terms, timers, or occurrence counters into
assignment fields within each macro.
In State Acquisition Mode, there are 12 sequence levels available. In
Timing Acquisition Mode there are 10 sequence levels available.
Sequence Level Usage
Generally, you would think using one macro in one sequence level
uses up one of the available sequence levels. This may not always be
the case. Some of the more complex pre-defined macros require
multiple sequence levels. Keep this point in mind if you are near the
limit on remaining sequence levels. The exact number of internal
levels required per macro, and the remaining available levels, is shown
within the macro library list.
The only instance where multiple levels ar-e used with the User-level
macro, is when the"<" duration is assigned.
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