Partial Memory Die Masked Verify Control Circuit
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Solution Overview
Problem
Partial memory dies, resulting from incomplete fabrication due to edge positioning on semiconductor wafers, are typically discarded as they lack essential components and do not function properly, leading to manufacturing waste and reduced yield.
Innovation Solution
Implementing a control circuit in partial memory dies that uses a pattern to identify and account for missing components during verification, forcing predetermined results for unavailable portions to prevent them from being counted as errors, thus enabling successful writing, reading, and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If partial memory dies are discarded due to missing components, then verification accuracy is maintained, but manufacturing yield and productivity decrease
Solution Approach 1:
The verification process is segmented into two parts: standard verification for complete dies and masked verification for partial dies. The mask pattern separates the verification treatment, allowing partial dies to be verified differently without affecting the accuracy for complete dies.
Solution Approach 2:
A mask pattern acts as an intermediary between the verification circuit and the memory structure. It selectively blocks verification signals for missing components, preventing false error detections while maintaining verification accuracy for present components.
2Measurement precision
If verification is performed on all memory cells including missing portions, then comprehensive error detection is achieved, but partial memory dies are incorrectly rejected
Solution Approach 1:
Different verification approaches are applied to different regions of the memory die. Complete portions undergo standard verification, while missing portions are masked out. This local differentiation allows accurate error detection in present components without penalizing the die for absent components.
Solution Approach 2:
Instead of verifying all memory cells uniformly, the system performs partial verification by excluding missing portions through masking. This selective action prevents false rejections while maintaining detection precision for actual errors in present components.
3Device complexity
If standard verification is applied to partial memory dies, then verification simplicity is maintained, but functional capability is reduced
Solution Approach 1:
The verification system achieves multi-functionality by handling both complete and partial dies through a unified process. The mask pattern enables the same verification circuitry to adaptively verify different die types, maintaining simplicity while increasing versatility.
Solution Approach 2:
The verification process dynamically changes parameters based on die type. For partial dies, the mask pattern modifies the verification behavior by blocking specific memory regions, allowing the system to adapt to different die configurations without complex redesign.
Data Source
AI summary
A memory system performs verification when writing to memory. It is possible that the memory system may be missing some components (or components may be otherwise unavailable). To account for missing or unavailable components when performing verification, the memory system uses a pattern of data that includes a mask identifying the missing or unavailable components. The mask is used to force a predetermined result of the verification for the missing or unavailable portions of the memory structure so that results of the verification that correspond to the missing or unavailable components are not counted as errors.