The paper introduces a novel idea of interconnect fault detection, localization and identification based on test response compaction. The above-mentioned operations are made at-speed. The testing process has been split into two steps. The first one is the detection step using a short test sequence of little diagnostic resolution. The second step is the localization step by means of a long, full diagnostic resolution sequence and it is made only in the case of the detection of faults in the first step. The final fault identification phase exploits information stored in the signatures. Because the signature is chosen to be 32 bit long aliasing is negligible. The proposed hardware concept is independent of the type of both the detection test sequence and the localization test sequence. The theory given in the paper is illustrated by the simulation results. Moreover the paper proposes to test testing hardware itself what makes the results reliable.

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