Storage Controller Indicator Compression for Threshold State Shaping
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Solution Overview
Problem
Non-volatile memory devices face performance degradation and reduced lifespan due to specific threshold voltage states, which existing technologies fail to effectively manage, leading to inefficiencies in data storage and retrieval.
Innovation Solution
A storage controller that performs state shaping and compression of indicator data to reduce the number of target bits corresponding to threshold voltage states, using a shape encoder to generate indicator data and a compressor to store it in a volatile memory device, thereby reducing the hardware burden on non-volatile memory devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If state shaping encoding is used to reduce the number of target bits corresponding to threshold voltage states, then performance degradation of memory cells is suppressed, but the capacity requirement of volatile memory device increases due to storage of indicator data
Solution Approach 1:
The patent applies compression encoding to transform indicator data from an uncompressed format to a compressed format, changing the data representation parameters. The compression encoder reduces the number of bits required to represent indicator data by identifying and exploiting patterns in the data, thereby reducing volatile memory capacity requirements while maintaining the effectiveness of state shaping encoding for suppressing memory cell performance degradation
Solution Approach 2:
The patent creates a compressed representation (copy) of the indicator data that preserves the essential information needed for state shaping operations. Instead of storing the full uncompressed indicator data, the system stores a compressed version that can be decompressed when needed, reducing the volatile memory capacity requirement while maintaining functional equivalence
2Duration of action of stationary object
If the number of target bits corresponding to threshold voltage states is reduced through state shaping, then memory cell lifespan is extended, but device complexity increases due to additional encoding operations
Solution Approach 1:
The patent divides the encoding process into distinct functional segments: state shaping encoding that reduces target bits and compression encoding that reduces indicator data size. This segmentation allows each component to be optimized independently and facilitates modular implementation, managing device complexity through structured division of functions while achieving both lifespan extension and reduced memory capacity requirements
3Quantity of substance
If indicator data is compressed, then volatile memory capacity requirement decreases, but processing time increases due to compression and decompression operations
Solution Approach 1:
The patent performs compression encoding on indicator data during the write operation, preparing the compressed data in advance for storage in volatile memory. This preliminary compression action ensures that when data is read, the system can efficiently decompress and use the indicator data without experiencing time penalties during critical read operations, balancing processing time across different operational phases
Data Source
AI summary
A method of operating a storage controller includes receiving raw data indicating a series of bits each corresponding to one of threshold voltage states, performing a first state shaping for reducing a number of first target bits of the series of bits, logical values of the first target bits being equal to a logical value of a target threshold voltage state of the threshold voltage states in a first page of plural pages, generating first indicator data that indicates the first target bits based on the first state shaping, compressing the first indicator data, and storing the compressed first indicator data.