Event Handling Principles; Usage Of Events - HP 81200 User Manual

Event Handling Principles

HP 81200 Data Generator/Analyzer Platform User Guide, Revision 2.1
Event Handling Principles
The HP 81200 system can detect a variety of events and react on events.
The reaction may simply be a trigger pulse at the TRIGGER OUTPUT of the
clock module, but can also be a change of the test sequence.

"Usage of Events"

"What is an Event?" on page 46
"Actions Upon an Event" on page 47
Usage of Events
Reacting on events provides many capabilities:
• Stop and go:
This is useful for production tests, where data is sourced to the DUT, a
measurement is performed with other equipment, the next data pattern
is sourced, and so on.
• Block switching:
The data sequence is no longer fixed. Based on certain events, certain
portions of the overall sequence can be executed.
This has the advantage that one and the same sequence can be created
and downloaded once and then used for several tests. There is no need
for re-programming the instrument.
• Trigger external devices:
The event can generate a trigger signal at the TRIGGER OUTPUT of the
clock module. This can be used to trigger an external instrument like a
sampling oscilloscope or logic analyzer to sample the data at an error
location.
• Bolt on:
The HP 81200 system can be integrated into a large IC test system. The
IC tester would issue a trigger to start the HP 81200 system for a special
measurement. The HP 81200 system would perform the test and return
pass/fail information that can be examinated and evaluated by the IC
tester.
• Match loop:
PLL-based devices typically require an initialization segment that has to
be repeated until the device is synchronized. The event that controls
repetition would be "an error occurred".
Introduction to the System
45