Memory Controller Erase Count Adjustment for Charge Loss
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Solution Overview
Problem
Flash memory devices face challenges in accurately tracking and managing erase cycles, leading to potential data loss and reduced lifespan due to charge loss, which existing technologies fail to address effectively.
Innovation Solution
A method for a memory controller to analyze data from non-volatile memory devices, determine charge loss, calculate the charge loss amount, and adjust the erase count accordingly, incorporating parameters like cell state, program loop count, and error bits to optimize memory operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing technologies are used to track erase cycles, then the memory device can perform basic erase operations, but the erase count management becomes inaccurate due to charge loss, leading to potential data loss and reduced lifespan
Solution Approach 1:
The patent implements a feedback mechanism where the memory controller reads data from memory blocks, analyzes charge loss conditions, and adjusts the erase count accordingly. The controller determines whether charge loss has occurred by analyzing read data, calculates the charge loss amount, and changes the erase count based on this analysis. This closed-loop feedback system continuously monitors and corrects erase count accuracy, preventing data loss and extending memory lifespan.
Solution Approach 2:
The patent performs preliminary detection of charge loss by analyzing read data before executing erase operations. The memory controller determines whether charge loss has occurred and calculates the charge loss amount in advance, allowing it to adjust the erase count proactively. This preliminary action prevents inaccurate erase counting from compromising data integrity in the first place.
2Duration of action of stationary object
If the erase count is not adjusted for charge loss, then the memory device operates with simpler control logic, but the lifespan is reduced due to inaccurate erase cycle tracking
Solution Approach 1:
The memory controller employs a feedback mechanism that reads data from memory blocks, analyzes charge loss, and adjusts erase count dynamically. This feedback loop extends memory device lifespan by ensuring accurate erase cycle tracking, preventing premature wear from miscounted erase operations.
Solution Approach 2:
The memory controller performs self-service by autonomously monitoring its own memory blocks for charge loss conditions and adjusting erase counts without external intervention. The controller analyzes read data, determines charge loss occurrence, calculates charge loss amounts, and modifies erase counts independently, extending device lifespan through self-managed accuracy correction.
3Measurement precision
If charge loss analysis is performed on read data, then the erase count accuracy is improved, but the processing time and computational resources increase
Solution Approach 1:
The memory controller performs partial charge loss analysis by examining specific parameters in read data rather than processing the entire data set. It determines whether charge loss has occurred based on analyzed parameters and calculates charge loss amounts selectively, achieving sufficient accuracy without the computational overhead of complete data analysis.
Solution Approach 2:
The controller performs preliminary analysis of read data parameters to quickly determine whether charge loss has occurred before executing full erase operations. By analyzing parameters such as cell state, program loop count, and error bit count in advance, the controller identifies charge loss conditions early, reducing the time required for comprehensive processing while maintaining detection accuracy.
Data Source
AI summary
A method for operating a memory controller is disclosed. The method includes receiving data output from a memory block of a non-volatile memory device and changing erase count of the memory block based on the received data.