Memory Subsystem Temperature Snapshotting for Reliable Error Reads
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Solution Overview
Problem
Memory access operations in memory sub-systems are susceptible to errors due to temperature variations, particularly during error handling flows, which can be exacerbated by interruptions and temporal gaps, leading to read errors and inefficiencies.
Innovation Solution
The memory sub-system suspends real-time temperature inputs during error handling operations by enabling a suspend temperature flag, using a fixed temperature for error handling steps, and resumes with real-time inputs after completion, ensuring consistent conditions for memory access operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time temperature inputs are used during error handling operations, then the system can adapt to temperature changes, but temperature variations cause read errors and reduce reliability
Solution Approach 1:
The system measures and stores the temperature at the beginning of the error handling flow before any operations are performed. This preliminary temperature measurement is then used consistently throughout the entire error handling process, preventing temperature variations from causing read errors while maintaining system reliability.
2Measurement precision
If temperature measurements are taken frequently during error handling, then accurate temperature data is available, but the process time increases
Solution Approach 1:
The temperature is measured once at the beginning of the error handling flow and stored for reuse throughout the entire process. This single preliminary measurement provides sufficient accuracy for all subsequent operations without requiring repeated measurements, thereby minimizing the time loss while maintaining measurement precision.
3Productivity
If error handling operations are performed with interrupted flows, then system responsiveness is improved, but temperature inconsistencies increase causing read errors
Solution Approach 1:
The temperature at the start of the error handling flow is measured and stored before any interruptions can occur. This preliminary temperature value remains fixed throughout the entire error handling process, even when the flow is interrupted and resumed. This ensures that all read operations use the same temperature reference, preventing temperature inconsistencies and read errors while allowing the system to respond to interruptions promptly.
Data Source
AI summary
A system having a processing device operatively coupled with a memory device to perform the following operations: responsive to detecting a triggering event, measuring a temperature of the memory device to obtain a suspend temperature value, enabling a suspend temperature flag to indicate that temperature input for a step of an error handling operation is based on the suspend temperature value. Updating an operating temperature with the suspend temperature value. Determining, using a data structure which maps temperatures to read level offsets, a read level offset for the step of the error handling operation, based on the operating temperature. Causing the step of the error handling operation to be performed on a set of cells using a read level value based on the read level offset and a base read level, an disabling the suspend temperature flag.