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Logic Analyzer Concepts
The Trigger Sequence
You can combine the pattern terms and range terms with logical
operators to form complex pattern expressions in the sequence-
advance, sequence-else, and TRIGGER on specifications.
For example,
Find "(<TERM1> • <TERM2>) + (<TERM3> • <TERM4>)"
Where <TERM> can be a single value on a set of labels, any value
within a range of values on a set of labels, or a glitch or edge transition
on a bit or set of bits.
Limitations affecting use of analyzer resources. There are
limitations on the way resources can be combined to form complex
pattern expressions. Resources are combined in a four-level hierarchy.
First, resources are divided into two groups. The groups can be
combined with AND or OR. Second, within these groups, resources are
combined into pairs. Pairs can also be logically combined using AND or
OR. Third, individual resources are combined into pairs using AND,
NAND, OR, NOR, XOR, and NXOR. Fourth, individual resources may
be included or excluded from participating in a pattern expression. You
can also include the logical negation of the resource. Fifth, the timing
terms are not available in the first sequence level.
The following table shows how resources are divided in the logic
analyzer. Remember that some resources may not be available,
depending on the analyzer configuration. For example, if you are using
the analyzer as a state analyzer, the Edge1 and Edge2 resources are
not available, and only one analyzer may use a resource at a time.