Memory Controller SPO Cycle Management
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Solution Overview
Problem
In memory systems, sudden power-offs (SPOs) often lead to inefficient use of free pages for dummy page generation, which can consume resources unnecessarily.
Innovation Solution
A memory system that utilizes a real-time clock (RTC) management circuitry to determine whether to delay dummy page generation based on an SPO occurrence cycle compared to a threshold value, generating dummy pages only when necessary using free or incomplete program pages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dummy page generation is performed immediately after SPO, then data integrity is maintained, but free pages are consumed unnecessarily
Solution Approach 1:
The dummy page generation timing is made dynamic based on the SPO occurrence cycle. The system adjusts the generation timing by comparing the current SPO cycle with a threshold value, delaying generation when cycles are frequent and proceeding immediately when cycles are sparse, thus optimizing free page usage while maintaining data integrity
Solution Approach 2:
The system changes the parameter of dummy page generation timing based on the SPO occurrence cycle parameter. By monitoring and comparing the SPO cycle against a threshold, the system dynamically adjusts whether to generate dummy pages immediately or delay generation, resolving the contradiction between reliability and resource consumption
2Loss of substance
If dummy page generation is delayed, then free pages are preserved, but data integrity may be compromised
Solution Approach 1:
The system implements feedback by continuously monitoring the SPO occurrence cycle and using this information to determine dummy page generation timing. The comparison of the measured SPO cycle against a threshold provides feedback that controls whether to delay or proceed with dummy page generation, balancing free page preservation with data integrity
Solution Approach 2:
The system performs preliminary assessment of the SPO occurrence cycle before deciding on dummy page generation. By evaluating the SPO cycle in advance and comparing it with the threshold, the system determines the appropriate timing for dummy page generation, ensuring data integrity while preserving free pages when possible
Data Source
AI summary
A memory system includes a memory device comprising a plurality of memory blocks; and a controller suitable for controlling the memory device, wherein the controller comprises a real time clock (RTC) management circuitry suitable for generating a sudden power-off (SPO) occurrence cycle using first and second RTC values when a first SPO occurs, and then comparing the SPO occurrence cycle to a threshold value to determine whether to delay dummy page generation; and a dummy page generation circuitry suitable for generating a dummy page using one or more free pages or an incomplete program page, excluding valid pages, from a memory block, among the plurality of memory blocks, according to the determination result of the RTC manager, the incomplete program page indicating a page in which a program operation is interrupted due to an SPO.