© The Institution of Electrical Engineers
Testing of random access memories (RAMs) gives more and more problems. The dimensions are growing rapidly and the denser devices result in more complex failure modes. The goal of our research was the evaluation of the existing test patterns in SRAM testing. A large diversity of test patterns was executed on silicon SRAM wafers and results were compared. The results affirm the conclusions: that the use of a well-defined fault model results into a more efficient test for permanent faults; and that the twocoupling fault model appears to be very efficient.
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