TAILIEUCHUNG - Models in Hardware Testing- P8

Models in Hardware Testing- P8:Model based testing is one of the most powerful techniques for testing hardware and software moving forward to nanoscaled CMOS circuits, we observe a plethora of new defect mechanisms, which require increasing efforts in systematic fault modeling and appropriate algorithms for test generation, fault simulation and diagnosis. | 7 Models for Power-Aware Testing 203 one scan chain segment all other segments can have their clocks disabled. When one scan chain segment has been completely loaded unloaded then the next scan chain segment is activated. This technique requires clock gating and the use of bypass multiplexers for segment-wise access. It drastically reduces shift power both average and peak dissipated in the combinational logic. It can be applied to circuits with multiple scan chains . STUMPS architectures even when test compression is used. It has no impact on the test application time and the fault coverage and requires minimal modifications to the ATPG flow. The main drawback of scan segmentation is that capture power remains a concern that needs to be addressed. This problem can be partially solved by creating a data dependency graph based on the circuit structure and identifying the strongly connected components SCC . Flip-flops in an SCC must load responses at the same time to avoid capture violations. This way capture power can be minimized Rosinger et al. 2004 . Low power scan partitioning has been shown to be feasible on commercial designs such as the CELL processor Zoellin et al. 2006 . Staggered Clocking Various staggered clock schemes can be used to reduce test power consumption Sankaralingam and Touba 2003 Lee et al. 2000 Huang and Lee 2001 . Staggering the clock during shift or capture achieves power savings without significantly affecting test application time. Staggering can be achieved by ensuring that the clocks to different scan flip-flops or chains have different duty cycles or different phases thereby reducing the number of simultaneous transitions. The biggest challenge to these techniques is its implications on the clock generation which is a sensitive aspect of chip design. In this section we describe a staggering clocking scheme proposed in Bonhomme et al. 2001 that can achieve significant power reduction with a very low impact and cost on the clock

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