21
Data Acquisition and Stimulus
State/Timing Modules
VisiTrigger Quickly Locates Your Most Elusive Problems

VisiTrigger technology is a break-

through in logic analysis usability. It

combines increased trigger function-

ality with a user interface that is easy

to understand and use. Now with

VisiTrigger, capturing complex events

is as simple as pointing to the trigger

function and filling-in-the-blanks.

Features and Applications
VisiTrigger • Use graphical views and sentence-like structures to help you
(available in the 16715A, define a trace event.
16716A, 16717A, 16740A, • Select trigger functions as individual trigger conditions or as
16741A, 16742A, 16750A building blocks to easily customize a trigger for your specific task.
16751A, 16752A, and • Set global counters to count events such as the number of times a
16760A state/timing function executes, or the number of accesses to an l/O port.
modules) • Set, clear or evaluate flags by any module in the frame. Flags allow
you to set up a trigger that is dependent on activity from more than
one bus in the system.
• Specify four-way arbitrary IF/THEN/ELSE branching.
Examples of Problems that Can be Captured Easily with VisiTrigger
Description Typical Applications Graphic
Pulse too narrow or too wide • Line hangs at wrong level (high or low).
• Asynchronous input (for example, an interrupt) persists too long.
• Strobe width is too narrow or too wide.
Time between two edges is • Excessive delay in responding to a bus grant request.
longer than specified • Excessive delay in responding to a data valid with a data
acknowledged.
Pattern lasts longer than a • A bus hangs up at a given value.
specified time
Pattern two exists within a • An incorrect response to a read or write.
specified time after pattern • An incorrect output from a FIFO or bridge.
one is detected
A pattern exists for less • A driver is not holding a bus value long enough for a receiver to
than a specified time respond.
Pulse too narrow Pulse too wide
Min width
Max width
OR
time
edge 1 edge 2
pattern
time
pattern 1
pattern 2
time
pattern
time