Unified Wear Table for Non-Volatile Memory Mode Switching
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Solution Overview
Problem
Current memory systems with non-volatile semiconductor storage devices face challenges in managing wear-out and durability, particularly due to differences in operation modes that affect storage capacity and reliability, requiring complex management of wear-out information across multiple operation modes.
Innovation Solution
A memory system that includes a control circuit and non-volatile memory capable of switching between SLC and TLC operation modes based on external device input, using a single wear-out information table to manage wear-out degree collectively across all blocks, thereby improving durability and simplifying control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate wear-out information tables are managed for each operation mode (SLC and TLC), then wear-out management accuracy is improved, but device complexity and storage capacity requirements increase
Solution Approach 1:
The patent merges separate wear-out information tables for SLC and TLC operation modes into a single unified wear-out information table. The control circuit identifies blocks used in either operation mode and manages their wear-out information collectively, reducing the number of separate tables needed and simplifying control while maintaining accurate wear-out tracking across different operation modes
Solution Approach 2:
The unified wear-out information table is designed to serve multiple operation modes (both SLC and TLC) simultaneously. The table structure and management mechanism are universal across different operation modes, allowing the same table to track wear-out for blocks regardless of which operation mode they are currently used in, thereby reducing overall system complexity
2Measurement precision
If separate wear-out information tables are managed for each operation mode (SLC and TLC), then wear-out tracking precision is improved, but storage capacity requirements increase
Solution Approach 1:
The patent combines multiple operation mode-specific wear-out tables into one unified table, directly reducing the total storage capacity required for wear-out information. Instead of allocating separate table spaces for SLC and TLC modes, the unified table consolidates these requirements into a single storage structure, thereby decreasing the overall quantity of storage resources needed while maintaining comprehensive wear-out tracking
3Reliability
If multiple wear-out information tables are maintained for different operation modes, then wear-out management accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The control circuit is designed to manage a unified wear-out information table that encompasses blocks from both SLC and TLC operation modes. This merging eliminates the need for the control circuit to switch between or coordinate multiple separate tables, significantly simplifying the control logic and operations while preserving accurate wear-out management across different operation modes
Solution Approach 2:
The unified wear-out information table and its management mechanism are designed to be universal across different operation modes. The control circuit uses a single set of operations to manage wear-out information regardless of whether blocks are used in SLC or TLC mode, making the system easier to operate without sacrificing management accuracy
Data Source
AI summary
A memory system includes a first non-volatile memory and a control circuit. The first non-volatile memory operates in one of a plurality of operation modes including at least a first operation mode and a second operation mode. The control circuit switches the operation mode of the first non-volatile memory based on an operation mode switching information received from an external device.