Memory Fault Repair Using Virtual Region Address Conversion
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Solution Overview
Problem
In memory systems with multiple information storage tables managed by separate virtual regions, fault repair is inefficient due to insufficient storage space for fault information, especially when faults occur across multiple physical regions, leading to difficulties in repairing faults effectively.
Innovation Solution
A control method and apparatus that convert physical basic region addresses to virtual basic region addresses, using position information vectors to store and retrieve data, allowing for the use of spare cells to replace fault addresses, thereby uniformly utilizing the information storage space across regions and improving fault repair efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If spare cell mapping information is stored in a single information storage table managed by one virtual region, then the structure is simple, but the storage space becomes insufficient when many faults occur in a specific subarray
Solution Approach 1:
The patent divides the information storage table into multiple separate information storage tables, each managed by a different virtual region. This segmentation allows the storage space to be distributed across multiple tables rather than concentrated in one table, increasing the total storage capacity for fault information while maintaining manageable complexity through virtual region organization.
Solution Approach 2:
The patent introduces a virtual region dimension to the information storage structure. Instead of storing all fault information in a single physical table, the system maps fault information to multiple virtual regions, each with its own information storage table. This dimensional expansion from single-table to multi-table structure across virtual regions significantly increases storage capacity.
2Reliability
If physical basic regions are divided into physical sub regions and combined into virtual basic regions, then fault repair can be performed, but multiple entries in the information storage table are occupied
Solution Approach 1:
The patent segments the information storage across multiple virtual regions, each managing its own information storage table. When faults occur in physical sub regions, the corresponding virtual region's information storage table is used, distributing the storage load rather than concentrating it in a single table. This segmentation maintains fault repair capability while improving storage space utilization efficiency.
Solution Approach 2:
Each virtual region has its own information storage table specifically for storing fault information related to its managed physical sub regions. This local quality approach ensures that fault information is stored in the most appropriate table, optimizing both the reliability of fault repair and the efficient utilization of storage space by matching fault locations with their corresponding virtual region tables.
Data Source
AI summary
Disclosed are a memory apparatus having a plurality of information storage tables managed by separate virtual regions and a control method thereof. That is, a fault repair is applied in a memory system having a plurality of information storage tables managed by a separate virtual region, so that the entire information storage space is uniformly used for every region to improve a performance of the entire system and maximize efficiency of the information storage space by utilizing the information storage space.