Memory Subsystem Temperature Control for Data Reliability
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Solution Overview
Problem
Memory sub-systems, particularly NAND flash memory, experience increased raw bit error rates due to temperature variations during data writing and reading, as charge accumulation and dissipation in memory cells are affected by temperature changes, leading to cross-temperature issues where data written at one temperature may not be reliably read at another.
Innovation Solution
Implementing a memory sub-system temperature control component that monitors the temperature of memory components and rewrites data when the temperature falls within a threshold range, ensuring reliable reading by adjusting for temperature-induced voltage shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data is written to memory at varying temperatures, then the memory sub-system can operate in different environmental conditions, but the raw bit error rate increases due to temperature-induced voltage shifts
Solution Approach 1:
The system performs preliminary temperature monitoring before data writing operations and determines whether the current temperature falls within an acceptable range. If the temperature is outside the acceptable range, the system waits until temperature conditions are suitable before proceeding with data writing, thereby preventing temperature-induced read errors in advance
Solution Approach 2:
The system changes the operational parameter of temperature by monitoring it continuously and adjusting data writing operations based on temperature conditions. The memory sub-system modifies its writing behavior (proceeding or waiting) based on the monitored temperature parameter to maintain data reliability
2Reliability
If the memory sub-system continuously monitors temperature and rewrites data when outside threshold range, then data reliability is improved, but the time required for data writing operations increases
Solution Approach 1:
The memory sub-system autonomously monitors its own temperature and makes decisions about when to write or rewrite data without requiring external intervention. The system serves itself by automatically determining whether temperature conditions are acceptable for data operations, reducing the need for external temperature control mechanisms
Solution Approach 2:
The system changes the temporal parameter of data writing by introducing variable wait times based on temperature conditions. When temperature is acceptable, writing proceeds immediately; when unacceptable, the system waits until temperature conditions improve, dynamically adjusting the timing of writing operations
Data Source
AI summary
A method includes monitoring a temperature of a memory component of a memory sub-system to determine that the temperature of the memory component corresponds to a first monitored temperature value; writing data to the memory component of the memory sub-system while the temperature of the memory component corresponds to the first monitored temperature value; determining that the first monitored temperature value exceeds a threshold temperature range; monitoring the temperature of the memory component of the memory sub-system to determine that the temperature of the memory component corresponds to a second monitored temperature value that is within the threshold temperature range; and rewriting the data to the memory component of the memory sub-system while the temperature of the memory component corresponds to the second monitored temperature value.