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2003 International Workshop on Memory Technology, Design and Testing (MTDT'03)
Reducing Test Time of Embedded SRAMs
San Jose, California
July 28-July 29
ISBN: 0-7695-2004-9
Baosheng Wang, University of British Columbia
Josh Yang, University of British Columbia
Andr? Ivanov, University of British Columbia
Compared with traditional functional fault models, fault model obtained from an Inductive Fault Analysis (IFA) test flow can provide an attractive basis for obtaining a good estimate of the overall test quality in terms of defect level and yield. However, the associated surging test time due to increased SRAM capacity is becoming a major challenge when testing either stand-alone or embedded SRAMs. This paper refines the functional fault models translated from defect simulations for embedded SRAMs with IFA proposed and described in [4]. Reconsidering the defect causes of the functional faults allows us to simplify the functional fault model FFM2 and formulate the test time required for detecting Data Retention Faults. We combine this simplification with the consideration of specific memory redundancy elements to develop a new March 6N Test algorithm. Simulation results reveal that our proposed fault modeling and test generation algorithm can reduce total test time to one half or less of that required by the methodology in [4], while maintaining the same defect and fault coverage.
Index Terms:
Embedded SRAM test, Inductive Fault Analysis, Test Time, Memory Redundancy, March Test
Citation:
Baosheng Wang, Josh Yang, Andr? Ivanov, "Reducing Test Time of Embedded SRAMs," mtdt, pp.47, 2003 International Workshop on Memory Technology, Design and Testing (MTDT'03), 2003
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