Compaction of pass/fail-based diagnostic test vectors for combinational and sequential circuits
ASP-DAC '06 Proceedings of the 2006 Asia and South Pacific Design Automation Conference
Diagnosis and Design for Diagnosability for Internet Routers
ISQED '06 Proceedings of the 7th International Symposium on Quality Electronic Design
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
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We address the problem of design-for-diagnosability, i.e., improving the accuracy of fault diagnosis or reducing its complexity through the insertion of observation points. To perform design-for-diagnosability efficiently, we use a procedure developed earlier for computing the number of fault pairs, NP , that are not guaranteed to be distinguished by a given test set. By using the concept of z - detection, NP can be computed efficiently without enumerating fault pairs and without performing non-fault dropping fault simulation. We study the possibility of increasing the diagnosability of a circuit by inserting observation points so as to reduce NP . Our results include the following. (1) We find experimentally the number of observation points that need to be inserted in order to achieve a close-to-minimum value for NP . (2) We describe an efficient procedure for inserting a given number of observation points so as to reduce NP. We present experimental results for benchmark circuits to demonstrate the accuracy of using NP to guide a designfor- diagnosability process.