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A Novel Test Flow for One-Time-Programming Applications of NROM Technology

A Novel Test Flow for One-Time-Programming Applications of NROM Technology,10.1109/TVLSI.2010.2087044,IEEE Transactions on Very Large Scale Integratio

A Novel Test Flow for One-Time-Programming Applications of NROM Technology  
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The NROM technology is an emerging non-volatile- memory technology providing high data density with low fabrica- tion cost. In this paper, we propose a novel test flow for the one- time-programming (OTP) applications using the NROM bit cells. Unlike the conventional test flow, the proposed flow applies the re- pair analysis in its package test instead of in its wafer test, and hence creates a chance for reusing the bit cells originally identified as a defect to represent the value in the OTP application. Thus, the proposed test flow can reduce the number of bit cells to be repaired and further improve the yield. Also, we propose an efficient and ef- fective estimation scheme to predict the probability of a part being successfully repaired before packaged. This estimation can be used todeterminewhetherapartshouldbepackaged,suchthatthetotal profit of the proposed test flow can be optimized. A series of exper- iments are conducted to demonstrate the effectiveness, efficiency, and feasibility of the proposed test flow.
Journal: IEEE Transactions on Very Large Scale Integration Systems - VLSI , vol. 19, no. 12, pp. 2170-2183, 2011
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