Non-Volatile Memory Data Rewrite During Refresh Window
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Solution Overview
Problem
Non-volatile memory devices face challenges in maintaining synchronous operation due to background maintenance operations that delay other memory operations, particularly during refresh windows, where error correction and data rewrite tasks are typically performed, leading to inefficiencies and potential data loss.
Innovation Solution
A non-volatile memory device is configured to determine an error metric for data stored in its medium and perform data rewrite operations exclusively during a predefined refresh window in response to an error threshold being met, allowing for synchronous operation by avoiding background maintenance delays and minimizing data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If background maintenance operations are performed continuously, then data integrity is maintained through error correction, but synchronous operation is delayed and user operations are postponed
Solution Approach 1:
The patent implements periodic maintenance operations by utilizing refresh windows that occur at predetermined intervals. Instead of continuous background maintenance, the system performs error correction and data rewrite operations only during these periodic refresh windows, allowing synchronous operations to proceed uninterrupted between refresh events. This periodic approach maintains data integrity while preserving synchronous operation performance.
2Reliability
If error correction operations are performed during refresh windows, then data loss is minimized, but the refresh window time is consumed and may delay subsequent operations
Solution Approach 1:
The patent implements self-service by having the non-volatile memory device autonomously perform error correction and data rewrite operations during refresh windows without requiring external intervention. The memory device monitors its own error metrics and automatically initiates maintenance operations when thresholds are exceeded, utilizing the refresh window time efficiently for self-maintenance while minimizing impact on subsequent operations.
3Productivity
If data rewrite operations are performed outside refresh windows, then user operations can proceed without delay, but data integrity may be compromised due to lack of error correction
Solution Approach 1:
The patent applies preliminary action by performing error correction and data validation during refresh windows before subsequent user operations occur. The system proactively identifies and corrects errors during the refresh period, ensuring data integrity is established beforehand, so that when user operations resume, they work with already-validated data without delays.
4Reliability
If continuous monitoring of error metrics is performed, then data integrity is maintained, but device complexity and power consumption increase
Solution Approach 1:
The patent implements partial monitoring by checking error metrics for only a subset of data during refresh windows rather than continuously monitoring all data. The system evaluates error metrics periodically and only initiates maintenance operations when error thresholds are exceeded, reducing the complexity and power consumption of the monitoring system while maintaining adequate data integrity protection.
Data Source
AI summary
Apparatuses, systems, methods, and computer program products are disclosed for data rewrite operations. A non-volatile memory device comprises a non-volatile memory medium. A non-volatile memory device is configured to determine an error metric for a non-volatile memory medium in response to a read request for the non-volatile memory medium. A non-volatile memory device is configured to receive a refresh command from a controller over a bus. A non-volatile memory device is configured to rewrite data from a non-volatile memory medium during a predefined time period after receiving a refresh command in response to an error metric satisfying an error threshold.