Flash Memory Controller Adaptive ECC Encoding
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Solution Overview
Problem
The use of low-density parity-check codes (LDPCs) in flash memory controllers increases error correction capability but results in higher ECC lengths, leading to reduced read speed due to increased data amounts, and traditional encoders output fixed-size chunks, resulting in low encoding efficiency for smaller data tables.
Innovation Solution
A flash memory controller that determines the type of data to be written and selects specific encoding/decoding settings based on data length, generating encoded data with suitable sizes for efficient writing and reading, improving access efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LDPC codes are used to increase error correction capability, then decoding capability is improved, but read speed decreases due to increased ECC length
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the ECC length and encoding/decoding settings based on the type of data being processed. Different data types (e.g., large files vs. small files) receive different ECC configurations, allowing the system to optimize between error correction capability and read speed according to actual needs rather than using a fixed ECC length for all data.
2Ease of manufacture
If traditional fixed-size chunk encoding is used, then encoding simplicity is maintained, but encoding efficiency decreases for smaller data tables
Solution Approach 1:
The patent implements dynamics by making the encoder adaptable to different data sizes. Instead of using a fixed chunk size, the system dynamically selects encoding parameters based on the actual data type and size, allowing efficient encoding of various data table sizes while maintaining the simplicity of the encoding process through automated parameter selection.
3Reliability
If decoder reads entire chunks for decoding, then decoding capability is maintained, but decoding efficiency decreases for small data tables
Solution Approach 1:
The patent applies local quality by tailoring the decoding process to the specific data being processed. Instead of uniformly decoding entire chunks for all data types, the system adjusts decoding parameters and chunk sizes according to the specific data table characteristics, improving decoding efficiency for small data tables while maintaining robust decoding capability for larger data.
Data Source
AI summary
A method for accessing a flash memory module includes: determining a type of data to be written into the flash memory module; selecting a specific encoding/decoding setting from a plurality of sets of encoding/decoding settings at least according to the type of data, wherein the plurality of sets of encoding/decoding settings correspond to different data lengths, respectively; utilizing the specific encoding/decoding setting to encode the data to generate encoded data; and writing the encoded data into a block of the flash memory module.