Memory Controller SPO Recovery Optimization
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Solution Overview
Problem
Memory systems face deterioration of word lines and consumption of free memory blocks due to repeated Sudden Power Off (SPO) events, leading to inefficient recovery operations and performance degradation.
Innovation Solution
A memory controller that recovers system data lost due to SPO and flushes it into the memory device before a power off preparation request is received, optimizing the recovery and flushing times to prevent unnecessary repeated operations and maintain system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory controller performs recovery operations for every SPO event, then system data is recovered, but word lines deteriorate and free memory blocks are consumed
Solution Approach 1:
The memory controller checks whether system data has been flushed before initiating recovery operations. By performing this check in advance, the controller avoids unnecessary recovery operations that would deteriorate word lines and consume free memory blocks, while still ensuring system data is recovered when actually needed.
2Reliability
If the memory controller performs recovery operations for every SPO event, then system data is recovered, but the frequency of recovery operations increases
Solution Approach 1:
The memory controller uses a flush status indicator as feedback to determine whether to perform recovery operations. This feedback mechanism allows the controller to distinguish between SPO events that require recovery and those that do not, thereby reducing the frequency of recovery operations while maintaining system data integrity.
3Reliability
If the memory controller flushes system data before power off preparation request, then data loss is prevented, but additional time and operations are required
Solution Approach 1:
The memory controller flushes system data into the memory device before receiving a power off preparation request from the host. By performing this flush operation in advance, the controller prevents data loss during SPO events without requiring additional time during the actual power off process, as the data is already safely stored.
Data Source
AI summary
Disclosed are a memory system, a memory controller, and a method of operating the memory system. The memory system performs an operation of recovering system data lost due to SPO when an SPO recovery operation is performed, and flushes recovered system data into the memory device after a first time point at which the operation of recovering the system data is completed and before a second time point at which a power off preparation request is received from a host.