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At-speed scan testing may suffer from severe yield loss due to the launch safety problem, where test responses are invalidated by excessive launch switching activity (LSA) caused by test stimulus launching in the at-speed test cycle. However, previous low-power test generation techniques can only reduce LSA to some extent but cannot guarantee launch safety. This paper proposes a novel & practical...
At-speed scan testing has become mandatory due to the extreme CMOS technology scaling. The two main at-speed scan testing schemes are namely Launch-Off-Shift (LOS) and Launch-Off-Capture (LOC). As it can be easily implemented, LOC has been widely investigated in the literature in the last few years, especially regarding test power consumption. Conversely, LOS has received much less attention. In this...
Recently design for manufacturability (DFM) has been required to achieve higher process yield. Information obtained from silicon by testing and/or fault analysis is sometimes fed back for redesign of VLSI circuits. In this paper we propose a method to maximize defect coverage of a test set initially generated for stuck-at faults in a full scan sequential circuit by using feed back information from...
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