Dynamic Block TOC and Weave Sequences for NVM Write Amplification
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Solution Overview
Problem
Conventional non-volatile memory systems are inefficient in accessing and managing smaller pieces of data, as they typically require accessing an entire page, leading to increased write amplification and performance degradation due to the need to read or write entire pages, even when only a portion of the data is needed.
Innovation Solution
The system configures non-volatile memory to store multiple logical addresses in each page, associates each page with a weave sequence indicating data programming time, and uses a dynamically-sized block table-of-contents (TOC) to efficiently map logical to physical addresses, allowing for concurrent recalculations and optimized data management during write operations and system boot-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple logical addresses are stored in each page, then the granularity of logical-to-physical mapping is improved and write amplification is reduced, but the device complexity increases due to the need for weave sequences and dynamic block TOC management
Solution Approach 1:
The patent divides the memory management structure into multiple components: weave sequences for tracking data programming times, block tables of contents for mapping logical to physical addresses, and super blocks for organizing pages. This segmentation allows the system to manage multiple logical addresses per page efficiently while maintaining clear organizational boundaries that reduce overall complexity.
Solution Approach 2:
The block table of contents is designed to be dynamically-sized and can be concurrently recalculated as user data is programmed. This dynamic adaptation allows the system to optimize the mapping structure based on actual usage patterns, improving write amplification efficiency without requiring a completely complex static structure.
2Adaptability or versatility
If a dynamically-sized block table-of-contents is used, then the adaptability to data programming operations is improved, but the calculation and management overhead increases
Solution Approach 1:
The block table of contents is pre-calculated and stored in the memory structure, allowing the system to quickly access mapping information without performing complex calculations during data programming operations. This preliminary preparation enables concurrent recalculation capability while minimizing real-time computational overhead.
Solution Approach 2:
The system uses weave sequences to track when data was last programmed and incorporates this feedback into the block TOC management. This feedback mechanism allows the system to update mappings efficiently based on actual programming operations, improving adaptability without requiring excessive calculation time.
3Reliability
If weave sequences are stored for each page, then the reliability of data programming tracking is improved, but the storage requirements and system complexity increase
Solution Approach 1:
The patent combines weave sequence information with the block table of contents and super block structures, creating an integrated memory management system. This merging approach allows reliable data programming time tracking while minimizing separate storage requirements, as the weave sequences are incorporated into existing structural elements rather than requiring additional dedicated storage.
Data Source
AI summary
Systems and methods are disclosed for configuring a non-volatile memory (“NVM”). In some embodiments, each block of the NVM can include a block table-of-contents (“TOC”), which can be encoded (e.g., run-length encoded) and dynamically-sized. Thus, as user data is being programmed to a block, the size of a block TOC can be concurrently recalculated and increased only if necessary. In some embodiments, the NVM interface can use a weave sequence stored in the context information and at least one weave sequence associated with each page of a block to determine whether to replay across the pages of the block after system boot-up.