Memory Device Faulty Usage-Based-Disturbance Data Handling
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Solution Overview
Problem
Existing memory devices struggle to effectively manage faulty activation counts, which can lead to incorrect determination of memory cell states due to usage-based disturbance, resulting in memory errors or data loss.
Innovation Solution
A memory device that detects faults in usage-based-disturbance data at a local-bank level, logs the associated memory address, and communicates this information to a host device for repair, thereby preventing unnecessary refresh operations and conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory device continuously monitors and refreshes memory cells to prevent usage-based disturbance, then data integrity is improved, but energy consumption and operational complexity increase
Solution Approach 1:
The patent applies preliminary action by proactively detecting faults in usage-based-disturbance data before they cause incorrect memory cell state determinations. The system monitors activation counts and identifies faulty data patterns in advance, allowing preventive measures to be taken that maintain data integrity without requiring continuous refresh operations throughout the entire memory operation cycle.
Solution Approach 2:
The patent implements feedback mechanisms where the memory device monitors its own operation and reports detected faults to the host device. This feedback loop allows the system to identify and communicate issues with usage-based-disturbance data, enabling targeted responses that maintain reliability while reducing unnecessary continuous monitoring and refresh operations.
2Reliability
If the memory device performs frequent refresh operations to correct potential errors, then data integrity is improved, but productivity and operational efficiency deteriorate
Solution Approach 1:
The system performs preliminary detection of faulty usage-based-disturbance data before incorrect memory states occur. By identifying and reporting faults in advance, the memory device can prevent erroneous refresh operations and maintain data integrity through more targeted, efficient correction procedures rather than continuous blanket refreshing.
Solution Approach 2:
The feedback mechanism allows the memory device to communicate detected faults to the host device, enabling intelligent decision-making about when refresh operations are actually necessary. This feedback loop eliminates unnecessary refresh cycles while maintaining data integrity, thereby improving operational efficiency.
3Reliability
If the memory device implements comprehensive fault detection and reporting mechanisms, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the fault detection function into a dedicated usage-based-disturbance data repair circuitry within the memory device and a separate host device processing function. This segmentation allows the memory device to maintain reliability through localized fault detection and reporting without implementing the entire complex repair and monitoring system at the host level, thereby managing device complexity.
Data Source
AI summary
Apparatuses and techniques for handling faulty usage-based-disturbance data are described. In an example aspect, a memory device uses a report flag to indicate that an address of a row that corresponds to the faulty usage-based-disturbance data is logged at a global-bank level and is accessible by a host device. The report flag also enables the memory device to avoid reporting another error until the host device has cleared information associated with a previously-reported error. In another example aspect, the memory device temporarily prevents usage-based-disturbance mitigation from being performed based on the faulty usage-based-disturbance data. This means that if the faulty usage-based-disturbance data would otherwise trigger refreshing of one or more rows that are proximate to the row corresponding to the faulty usage-based-disturbance data, the memory device does not perform these refresh operations. This is beneficial by conserving resources for refreshing victim rows that are identified based on valid usage-based-disturbance data.