HP 16550A User Reference page 97

100-mhz state/500-mhz timing logic analyzer
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The Trigger Menu
Assigning Resource Term Names and Values
Timer Terms
Each Timer term is assigned to either of the two analyzers, but not both.
With timers inserted into sequence levels, you can start a timer in one level,
pause it, or stop it in another sequence level.
Timers are either true or false. Timers start as you enter the sequence level,
and when its count expires, it becomes true. If a timer is paused in one level,
it must be continued in another level before it can count through.
As more sequence levels are added, the timer status in the new levels default
to Off. Timers must be continued or started in each new level if it is
appropriate. When a timer expires or stops, its count resets to zero.
Combination of Terms
Combination terms are configured and selected from within sequence levels.
All user-defined resource terms can be combined to create complex qualifiers
that occupy a single assignment field space.
When the term assignment field is selected, and "Combination" is selected
from the pop-up selection list, a logical assignment menu appears. Use this
menu to turn on resource terms and input them into a chain of logical
operators.
Logic Operation Choices
When the combination is placed in the assignment field, if the term is too
long to fit in the assignment field, the display is truncated.
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