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Chinemerem Nwokolo
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Proceedings Papers
ISTFA2023, ISTFA 2023: Conference Proceedings from the 49th International Symposium for Testing and Failure Analysis, 168-176, November 12–16, 2023,
Abstract
View Papertitled, On Demand Bit-Level SRAM Validation using CW 785nm Laser-Induced Fault Analysis (LIFA)
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for content titled, On Demand Bit-Level SRAM Validation using CW 785nm Laser-Induced Fault Analysis (LIFA)
We present the first experimental demonstration of on demand bit-level Static Random Access Memory (SRAM) validation and isolation through the exploitation of a continuous wave (CW) 785nm Laser-Induced Fault Analysis (LIFA) system. Through careful test pattern edits and the observation of a simple pass/fail flag, the ability to spatially map the physical location of pre-selected bits in 40nm, 16nm, and 5nm SRAM arrays using correlation units is confirmed. This work demonstrates a novel and highly-efficient methodology for rapid bit-level logical-to-physical identification. It also improves localization efficacy over conventional bitmap validation best-known methods (BKM) which typically rely on post-fail Photo-Emission Microscopy (PEM) and/or Soft Defect Localization / Laser-Assisted Device Alteration (LADA) performed on an actual fail unit. This new technique re-defines the state-of-the-art in SRAM bitmap validation and localization and offers a pathway to significantly improve cycle time for both product bitmap qualification and subsequent root cause identification.