Dynamic Datagroup Attribute Assignment for Flash Memory

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Solution Overview

Problem

Existing memory systems lack the ability to dynamically update data attributes, leading to inefficient management of data storage, particularly in flash memory devices where 'hot' and 'cold' data are incorrectly identified due to limited partition sizes and static marking approaches, resulting in suboptimal performance and longevity.

Innovation Solution

The introduction of a 'datagroup' feature allows hosts to dynamically assign data attributes, enabling the storage device to receive and manage these attributes through a new command, allowing for dynamic reassignment of data blocks and improved data management by grouping local block addresses, thereby enhancing write amplification and access efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If static partition marking is used to identify hot and cold data, then data management is simplified, but data attribute identification accuracy deteriorates leading to suboptimal performance

Engineering Contradiction:

Improvedata management simplicityVSAvoidhot and cold data identification accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent transitions from static partition marking to dynamic attribute assignment. The host can now dynamically update data attributes (hot, cold, sequential, random, read-only, temporary-write) based on actual usage patterns, allowing the system to adapt to changing data characteristics over time rather than relying on fixed initial classifications.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces new controllable parameters for data attributes that can be modified during operation. By allowing hosts to update attributes like access frequency (hot/cold), access pattern (sequential/random), and write characteristics (temporary-write), the system can precisely track and respond to actual data behavior, resolving the contradiction between simplicity and accuracy.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If limited partition sizes are used in flash memory, then device complexity is reduced, but write amplification increases due to incorrect data identification

Engineering Contradiction:

Improvepartition structure complexityVSAvoidwrite amplification

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The patent implements a feedback mechanism where the host continuously monitors data access patterns and updates attributes accordingly. This feedback loop allows the system to accurately identify hot and cold data, enabling more effective wear leveling and reducing unnecessary write operations to already-programmed blocks, thereby reducing write amplification without requiring complex partition structures.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The host system takes responsibility for tracking and updating data attributes based on its own usage patterns. This self-service approach eliminates the need for complex controller-based partition management while providing accurate data characterization, allowing the memory device to optimize write operations based on host-provided attribute information.

Inventive Principle:

Principle #25Self-service

3Ease of manufacture

If static data attributes are assigned during manufacturing, then production time is reduced, but adaptability to changing usage patterns is lost

Engineering Contradiction:

Improveinitial setup speedVSAvoiddata attribute flexibility

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent maintains preliminary static attribute assignment during manufacturing for quick initial setup, but adds the capability for dynamic attribute updates during operation. This allows the system to start with default classifications and then adapt to actual usage patterns over time, combining the benefits of fast manufacturing with long-term adaptability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent makes the data attribute system multi-functional by supporting both static manufacturing-time assignment and dynamic host-controlled updates. This universal approach allows the same attribute mechanism to serve both initial production requirements and ongoing operational adaptability, eliminating the need to choose between manufacturing speed and flexibility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11609850B2Method of operating a memory with dynamically changeable attributes

Publication Date: 2023.03.21 MICRON TECHNOLOGY INC

AI summary

A feature can be defined to allow data attributes to be dynamically assigned to data in a storage device. For example, a feature referred to as a “datagroup” is introduced. A datagroup is defined as a grouping of a range of local block addresses. A storage device can be divided into a number of datagroups. Each datagroup can have its own data attributes configuration, which can have a specified number of bits. A new command is defined to allow a host to dynamically assign attributes of datagroups of a storage device. For example, the command can provide for dynamically assigning datagroup attributes by sending a byte-mapping table in the command from the host to the storage device.