OPMISR: the foundation for compressed ATPG vectors
Proceedings of the IEEE International Test Conference 2001
Test application time and volume compression through seed overlapping
Proceedings of the 40th annual Design Automation Conference
Scan Vector Compression/Decompression Using Statistical Coding
VTS '99 Proceedings of the 1999 17TH IEEE VLSI Test Symposium
X-Compact: An Efficient Response Compaction Technique for Test Cost Reduction
ITC '02 Proceedings of the 2002 IEEE International Test Conference
Masking of Unknown Output Values during Output Response Compression byUsing Comparison Units
IEEE Transactions on Computers
On Compacting Test Response Data Containing Unknown Values
Proceedings of the 2003 IEEE/ACM international conference on Computer-aided design
VLSID '05 Proceedings of the 18th International Conference on VLSI Design held jointly with 4th International Conference on Embedded Systems Design
Channel Masking Synthesis for Efficient On-Chip Test Compression
ITC '04 Proceedings of the International Test Conference on International Test Conference
X-tolerant Test Data Compaction with Accelerated Shift Registers
Journal of Electronic Testing: Theory and Applications
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This paper proposes a response compactor, named ChiYun compactor, to compact scan-out responses in the presence of unknown values. By adding storage elements into an Xor network, a ChiYun compactor can offer multiple chances for a scan-out response to be observed at ATE channels in one to several scan-shift cycles. We also develop a mathematical analysis to predict the percentage of scan-out responses masked by the unknown values for the ChiYun compactor. With this analysis, we can derive the optimal configuration of a ChiYun compactor for minimizing the masking of scan-out responses. We further propose a selection scheme for the ChiYun compactor to selectively observe partial Xor results for improving the fault coverage. The experimental results demonstrate the effectiveness of the proposed mathematical analysis and the selection scheme. We also demonstrate that the unknown tolerance of a ChiYun compactor is higher than that of a state-of-the-art response compactor proposed in [11].