Test volume and application time reduction through scan chain concealment
Proceedings of the 38th annual Design Automation Conference
Computers and Intractability: A Guide to the Theory of NP-Completeness
Computers and Intractability: A Guide to the Theory of NP-Completeness
Test vector decompression via cyclical scan chains and its application to testing core-based designs
ITC '98 Proceedings of the 1998 IEEE International Test Conference
Reducing Test Application Time for Full Scan Embedded Cores
FTCS '99 Proceedings of the Twenty-Ninth Annual International Symposium on Fault-Tolerant Computing
Virtual Scan Chains: A Means for Reducing Scan Length in Cores
VTS '00 Proceedings of the 18th IEEE VLSI Test Symposium
Adapting Scan Architectures for Low Power Operation
ITC '00 Proceedings of the 2000 IEEE International Test Conference
Scan Power Reduction Through Test Data Transition Frequency Analysis
ITC '02 Proceedings of the 2002 IEEE International Test Conference
Minimized Power Consumption For Scan-Based Bist
ITC '99 Proceedings of the 1999 IEEE International Test Conference
Aggressive Test Power Reduction Through Test Stimuli Transformation
ICCD '03 Proceedings of the 21st International Conference on Computer Design
System-on-a-chip test-data compression and decompression architectures based on Golomb codes
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Reducing test application time, test data volume and test power through Virtual Chain Partition
Integration, the VLSI Journal
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Scan-based testing methodologies remedy the testability problem of sequential circuits; yet they suffer from prolonged test time and excessive test power due to numerous shift operations. The correlation among test data along with the high density of the unspecified bits in test data enables the utilization of the existing test data in the scan chain for the generation of the subsequent test stimulus, thus reducing both test time and test data volume. We propose a pair of scan approaches in this paper; in the first approach, a test stimulus partially consists of the preceding stimulus, while in the second approach, a test stimulus partially consists of the preceding test response bits. Both proposed scan-based test schemes access only a subset of scan cells for loading the subsequent test stimulus while freezing the remaining scan cells with the preceding test data, thus decreasing scan chain transitions during shift operations. The proposed scan architecture is coupled with test data manipulation techniques which include test stimuli ordering and partitioning algorithms, boosting test time reductions. The experimental results confirm that test time reductions exceeding 97%, and test power reductions exceeding 99% can be achieved by the proposed scan-based testing methodologies on larger ISCAS89 benchmark circuits.