We describe a dynamic test compaction procedure for four-way bridging faults. Under this fault model, a pair of lines g i ,g j is associated with four bridging faults corresponding to two possible combinations of opposite values on g i and g j , and two options for the line whose value is faulty in the presence of the fault (either g i or g j ). Compaction is achieved by simultaneously considering faults that have a line g i with a value α i in common, such that the value α i on g i is affected by the presence of the fault. Faults with a common line g i and value α i differ only in the second line g j of each pair of bridged lines, and the second lines only need to be assigned the value α i in order to detect all the faults. This strong relationship between the faults allows us to derive tests that detect large numbers of these faults, resulting in compact test sets.
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