HP 16501A User Manual page 88

Concepts
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, 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.
The following table shows how resources are divided in the
HP 16550A. 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. If the timers are off, the Timer1 and Timer2
resources are not available.
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