International Business Machines Corporation

Stuart J Hall

Marcel J Robillard

Luigi Ternullo, Jr

John P Connor

James J Covino

Luigi Termullo, Jr

A method and apparatus for evaluating a memory having memory elements and redundant memory elements for redundancy replacement. The redundant memory elements are tested to determine the number of good redundant memory elements. The memory elements are also tested to determine whether there are any failing memory elements. It is then determined whether a sufficient number of good redundant elements are available to replace the failing memory elements. If an insufficient number of redundant memory elements are available, the testing is stopped.

Method and apparatus for testing redundant word and bit lines in a

A circuit, as a logic circuit or a memory circuit, having testing latches. The testing latches include an input latch, a slave latch, and true and complement output latches. The output of the slave latch is NANDed with a DESELECT signal to deselect the output latches. The testing latches can be used in a method of characterizing or testing a memory or logic integrated circuit with scannable output latches. At least one output latch has an input latch, a slave latch, and an output latch which may contain a Complement Latch, and a True latch. In the testing process an output of the slave latch is NANDed with a deselect signal to allow testing or characterization by masking known 'fail' signals.

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Underhill Center, VT, United States of America

Stuart J Hall