Memory Die Reliability Binning via Accelerated Seasoning
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Solution Overview
Problem
Conventional memory sub-systems do not effectively pre-screen memory dies for reliability before assembly, leading to variability in die-level performance and potential compromise of overall device reliability due to sub-optimal dies, which can result in higher error rates and data integrity issues.
Innovation Solution
Implementing a pre-assembly test setup that applies accelerated stress-testing, or 'high-stress seasoning,' to categorize memory dies into reliability bins, ensuring only reliable dies are assembled into memory devices, and allowing for dynamic adjustment of performance parameters during the device's lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional memory sub-systems assemble memory devices without pre-screening memory dies, then assembly process is simple and fast, but reliability of the memory device deteriorates due to variability in die-level performance and sub-optimal dies
Solution Approach 1:
The patent applies preliminary action by implementing accelerated seasoning cycles and defect scans on individual memory dies before assembly. The die screening component performs stress testing and error rate measurements in advance, categorizing dies into reliability bins. This preliminary screening ensures that only reliable dies are selected for assembly, directly improving memory device reliability while managing the complexity through automated pre-assembly testing procedures.
2Reliability
If pre-assembly screening is implemented to categorize memory dies into reliability bins, then defective parts per million is reduced, but testing time and complexity increase
Solution Approach 1:
The patent applies parameter changes by implementing accelerated seasoning cycles that subject memory dies to elevated temperatures and increased voltage stress levels. These parameter changes accelerate the manifestation of defects and reliability issues, allowing the die screening component to identify sub-optimal dies more quickly. The accelerated testing parameters enable faster screening while maintaining accurate reliability classification, thereby reducing the time loss associated with conventional screening methods.
3Reliability
If high-stress seasoning is applied to memory dies, then sub-optimal dies are identified and discarded, but the screening process becomes more complex
Solution Approach 1:
The patent introduces an intermediary component - the die screening component - that mediates between the high-stress seasoning process and the assembly process. This intermediary automatically performs accelerated seasoning cycles, monitors error rates, and categorizes dies into reliability bins. By introducing this specialized intermediary component, the patent manages the complexity of high-stress screening through automation and specialization, enabling reliable identification and discarding of sub-optimal dies without overwhelming system complexity.
Data Source
AI summary
An accelerated seasoning cycle criterion is associated with a memory die of a number of memory dies. The memory die is subjected to one or more accelerated seasoning conditions during accelerated seasoning cycles. Responsive to determining that the accelerated seasoning cycle criterion has been satisfied, a defect scan is performed on the memory die. The memory die is associated with a respective reliability bin of a plurality of reliability bins in view of a result of the defect scan, wherein the result of the defect scan satisfies one or more predetermined threshold reliability criteria corresponding to the respective reliability bin.