Hybrid ECC Switching for Worn Non-Volatile Memory Blocks
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Solution Overview
Problem
Existing non-volatile memory systems face performance degradation and increased computational overhead as blocks near the end of their usable life, due to the limitations of using either 1-bit or 2-bit error correction code (ECC) algorithms, which compromise data integrity and power efficiency.
Innovation Solution
A method that dynamically switches between 1-bit and 2-bit ECC algorithms based on the erase count of blocks, using a 1-bit ECC for blocks with low erase counts and a 2-bit ECC for blocks nearing the end of their life, allowing for adaptive error correction and reduced computational overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 2-bit ECC algorithm is used to encode and decode data, then data integrity is improved, but computational overhead and power consumption increase
Solution Approach 1:
The patent implements dynamic switching between 1-bit and 2-bit ECC algorithms based on the erase count of memory blocks. The system transitions from a static ECC approach to a dynamic one where the algorithm selection changes according to block wear status, optimizing the balance between data integrity and power consumption at different stages of block lifecycle
Solution Approach 2:
The system changes the ECC algorithm parameter based on the erase count threshold. When blocks exceed the threshold, the system switches from 1-bit to 2-bit ECC, effectively using parameter changes to adapt error correction strength to the actual wear condition of memory blocks
2Reliability
If a 2-bit ECC algorithm is used, then error correction capability is improved, but computational overhead increases
Solution Approach 1:
The patent segments the memory blocks into two groups based on erase count: blocks below the threshold use 1-bit ECC while blocks above the threshold use 2-bit ECC. This segmentation allows the system to apply different levels of error correction complexity to different blocks, reducing overall computational overhead while maintaining necessary reliability
Solution Approach 2:
The system applies partial error correction (1-bit ECC) to blocks that don't require it, and only applies full error correction (2-bit ECC) to blocks that have exceeded the erase count threshold. This partial action approach avoids the excessive computational overhead of applying 2-bit ECC to all blocks uniformly
3Use of energy by moving object
If a 1-bit ECC algorithm is used, then power consumption is reduced, but data integrity deteriorates
Solution Approach 1:
The system dynamically adjusts ECC strength based on block wear status. For blocks below the erase count threshold, 1-bit ECC is used to reduce power consumption, while for blocks above the threshold, the system transitions to 2-bit ECC to maintain data integrity, creating a dynamic power-management strategy
Solution Approach 2:
The ECC algorithm parameter is changed based on the erase count of memory blocks. The system uses 1-bit ECC for blocks with erase counts below the threshold and switches to 2-bit ECC for blocks above the threshold, effectively using parameter changes to balance power consumption and data integrity
4Use of energy by moving object
If computational overhead is reduced by using 1-bit ECC, then power consumption decreases, but performance is compromised for worn blocks
Solution Approach 1:
The patent segments memory blocks into young blocks (below threshold) and worn blocks (above threshold), applying different ECC strategies to each segment. This segmentation enables the system to reduce power consumption on young blocks while maintaining performance on worn blocks that require stronger error correction
Solution Approach 2:
The system changes the ECC algorithm parameter based on block wear status, using 1-bit ECC for power efficiency on young blocks and switching to 2-bit ECC for performance maintenance on worn blocks, effectively using parameter changes to optimize the power-performance tradeoff
Data Source
AI summary
Methods and apparatus for using different error correction code algorithms to encode and to decode contents of blocks within a non-volatile memory are disclosed. According to one aspect of the present invention, a method for storing data within a non-volatile memory includes identifying a first block into which the data is to be stored, and obtaining an indicator associated with the first block. A determination may then be made regarding whether the indicator indicates that the data is to be encoded using a first algorithm. The data is encoded using the first algorithm when it is determined that the data is to be encoded using the first algorithm, after which point the data encoded using the first algorithm is written into the first block.