A Partial Scan Method for Sequential Circuits with Feedback
IEEE Transactions on Computers
COMPCON '92 Proceedings of the thirty-seventh international conference on COMPCON
Cost-free scan: a low-overhead scan path design methodology
ICCAD '95 Proceedings of the 1995 IEEE/ACM international conference on Computer-aided design
Test point insertion: scan paths through combinational logic
DAC '96 Proceedings of the 33rd annual Design Automation Conference
Orthogonal Scan: Low-Overhead Scan for Data Paths
Proceedings of the IEEE International Test Conference on Test and Design Validity
Synthesis-for-scan and scan chain ordering
VTS '96 Proceedings of the 14th IEEE VLSI Test Symposium
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Functional scan chains are scan chains that have scan paths through a circuit's functional logic and flip-flops. Establishing functional scan paths by test point insertion (TPI) has been shown to be an effective technique to reduce the scan overhead. However once the scan chain is allowed to go through functional logic, the traditional alternating test sequence is no longer enough to ensure the correctness of the scan chain. We identify the faults that affect the functional scan chain, and show a methodology to find tests for these faults. Our results have the number of undetected faults at only 0.006% of the total number of faults, or 0.022% of the faults affecting the scan chain.