Memory Initialization by Power Loss Duration to Reduce Startup Delay
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Solution Overview
Problem
Conventional memory sub-systems face inefficiencies and delays due to extensive initialization operations after power loss, which impact performance and reliability, particularly in NAND flash devices, leading to wasted resources and accelerated wear.
Innovation Solution
A memory sub-system controller equipped with a physical capacitor and binary counter measures power loss duration to selectively perform a subset of initialization operations based on the duration, optimizing initialization by skipping unnecessary operations if the power loss is brief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extensive initialization operations are performed after power loss, then data integrity and reliability are improved, but initialization time and system delay increase
Solution Approach 1:
The patent applies partial action by selectively executing only necessary initialization operations based on power loss duration. The controller determines whether to perform full initialization or skip certain operations (such as scanning or program/verify cycles) based on whether the power loss exceeded a threshold, thereby reducing initialization time while maintaining data integrity when appropriate
Solution Approach 2:
The patent uses preliminary action by implementing a power loss detection mechanism that monitors duration before initialization begins. The controller proactively determines the appropriate initialization scope based on the measured power loss duration, allowing optimized initialization to start immediately without unnecessary delays
2Reliability
If extensive initialization operations are performed after power loss, then reliability is improved, but resource consumption and device wear increase
Solution Approach 1:
The patent reduces device wear by performing only partial initialization operations when power loss duration is below the threshold. By skipping operations such as comprehensive scanning and program/verify cycles in brief power loss scenarios, the patent minimizes unnecessary write operations and resource consumption that would accelerate NAND flash wear, while still maintaining adequate reliability
3Productivity
If brief power loss is detected, then initialization speed is improved, but risk of data corruption increases
Solution Approach 1:
The patent changes the parameter of initialization scope based on the power loss duration parameter. When power loss duration is below the threshold, the controller modifies the initialization behavior to skip certain operations, achieving faster initialization. The threshold parameter acts as a decision boundary that balances speed and reliability
Solution Approach 2:
The patent implements feedback by continuously monitoring power loss duration and using this information to dynamically adjust initialization operations. The controller measures the actual power loss time and feeds this information back into the initialization decision logic, allowing real-time optimization of the initialization process based on actual conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the speed and efficiency of memory sub-system initialization, reducing delays and resource waste while maintaining data integrity and extending device lifespan.
Implementation Method 1
A memory sub-system controller equipped with a physical capacitor and binary counter measures power loss duration
Data Source
AI summary
The disclosure configures a memory sub-system controller to optimize initialization of a memory sub-system based on duration of power cycle. The controller initiates memory initialization routine for starting up a memory sub-system after a power loss event. The controller, as part of executing the memory initialization routine, determines that the memory sub-system has previously lost power for a period of time prior to initiating the memory initialization routine. The controller determines whether the period of time transgresses a threshold period of power loss and selectively executes a first set of operations as part of the memory initialization routine in response to determining whether the period of time transgresses the threshold period of power loss.