Tektronix DAS 9221 Option 04, User Manual

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Glossary
Glossary–16
DAS System User Manual
TLA 520 Logic Analyzer
A self-contained 100 MHz Logic Analyzer. The TLA 520 Logic Analyzer
operates similar to a DAS mainframe with two 92C96 Data Acquisition
Modules. Setups from the TLA 520 Logic Analyzer can be restored to a
DAS mainframe with two or more 92C96 Data Acquisition Modules.
Trace Mode
A feature of the 92S16/32 Pattern Generation Module’s Monitor menu that
causes the pattern generator to run at a clock rate slow enough to allow you
to spot developing trends and to detect program flow changes due to test and
branch instructions.
Trigger
An event or condition that leads to the end of the acquisition cycle. When
started, a logic analyzer continuously acquires data from a system under test
until the trigger occurs. After triggering, the logic analyzer continues to load
data until the post-fill requirement is met. (See Pre-fill and Post-fill.)
Trigger Event
The last (or only) event in the sequence of events that causes a data
acquisition module to trigger.
Trigger Position
Where the trigger resides in acquisition memory. Electing to place the trigger
in the center of memory means that half of the acquisition consists of data
that occurred after the trigger.
Trigger Specification Program
The highest level of triggering control. A trigger specification program is
composed of one or more States.
Unassert
To cause a signal or line to change from its logic true state to its logic false
state.
Utility Menu
A general class of menus that serve as system-level tools. These menus are
accessible from anywhere in the menu structure. The list of available utilities
remains constant, regardless of installed module(s).
Word Recognition
The matching of a specific data word with the presence or absence of that
word in signals acquired by the logic analyzer.
Z
A character that, when entered in place of a numeric value in the 92S16/32
Program menu, specifies the internal inhibit bit for the pattern generators.