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Automatic Diagnostic Wrap and Calibration of Tester Output Signals

IP.com Disclosure Number: IPCOM000115006D
Original Publication Date: 1995-Feb-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Fleurbaaij, JM: AUTHOR

Abstract

Disclosed is a special Interface Board for use on high-speed memory testers which allows for the tester output signals to be checked at actual speed and also calibrate these signals with respect to a reference.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 71% of the total text.

Automatic Diagnostic Wrap and Calibration of Tester Output Signals

      Disclosed is a special Interface Board for use on high-speed
memory testers which allows for the tester output signals to be
checked at actual speed and also calibrate these signals with respect
to a reference.

      The Interface Board described can be implemented on different
memory testers.  The normal Interface Board on memory testers
repowers the output signals and routes them to connectors.  In this
way the product under test can be connected to the tester.  The
special Interface Board has on it some additional logic which will
enable the processor that controls the tester to verify that the
output signals from the tester are generating the correct waveforms.
It would do this by running a diagnostic program.  This program runs
the tester so as to produce the normal output signals and compare
these against each other at actual tester operating speed.  The
additional logic does the comparison and the storing of the error
information, which can then be read by the processor.  Refer to the
Figure for the following description.

      The Interface Board normally has drivers on it to drive the
tester signals to the test application.  The additional logic
consists of the following.  The signals from the tester are also
routed in pairs to comparators.  Each pair of tester signals is
programmed by the diagnostic program to produce two identical
waveforms and as long as these are the...