Temperature-Adaptive Memory Refresh With Threshold-Based Line Activation
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Solution Overview
Problem
Volatile memory systems, such as DRAM, experience performance issues due to charge leakage at temperatures outside the typical operating range, leading to reduced reliability and performance of refresh operations.
Innovation Solution
A memory system adjusts refresh operations based on temperature, activating a set of access lines with a count determined by temperature thresholds to reduce refresh current and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If refresh operations are performed at fixed intervals regardless of temperature, then memory reliability is maintained under normal conditions, but performance deteriorates at temperatures outside the typical operating range due to charge leakage
Solution Approach 1:
The patent implements dynamic refresh operations where the refresh interval is adjusted based on temperature conditions. The memory controller monitors temperature and modifies refresh timing accordingly - using shorter intervals at extreme temperatures and longer intervals at moderate temperatures, thereby adapting the refresh strategy to environmental conditions while maintaining reliability and optimizing performance
Solution Approach 2:
The patent changes the temporal parameter of refresh operations by adjusting refresh intervals based on temperature. The system transitions from fixed-interval refreshing to variable-interval refreshing, where the refresh period becomes a dynamic parameter that responds to temperature changes, resolving the contradiction between reliability and performance
2Reliability
If refresh operations are performed frequently to maintain reliability at extreme temperatures, then memory reliability improves, but energy consumption and system complexity increase
Solution Approach 1:
The patent dynamically changes the refresh interval parameter based on temperature conditions. At moderate temperatures, longer refresh intervals reduce refresh current consumption. At extreme temperatures, shorter intervals ensure reliability. This parameter adaptation resolves the contradiction between reliability and energy consumption
Solution Approach 2:
The system implements dynamic refresh scheduling where the refresh frequency adapts to temperature conditions. Rather than using a fixed high-frequency refresh schedule that would consume excessive energy at all times, the system dynamically adjusts the schedule to match actual memory stability requirements, reducing unnecessary energy consumption while maintaining reliability
3Reliability
If temperature monitoring and adaptive refresh control are implemented, then refresh operation reliability improves, but device complexity increases
Solution Approach 1:
The memory controller performs self-monitoring of temperature conditions and automatically adjusts refresh intervals without external intervention. The system serves itself by detecting temperature changes and autonomously modifying refresh operations, which improves reliability while minimizing the need for additional complex control infrastructure
Solution Approach 2:
The patent implements a feedback mechanism where the memory controller monitors temperature and uses this information to adjust refresh operations. The temperature sensor provides feedback to the control logic, which then modifies refresh timing accordingly. This closed-loop control improves reliability while keeping the complexity manageable through straightforward feedback-based decision making
Data Source
AI summary
Methods, systems, and devices for temperature-dependent refresh operations are described. A memory system may adjust refresh operations based on a temperature of the memory system to reduce a refresh current and improve reliability of the refresh operations. For example, the memory system may include a temperature sensor configured to provide temperature information associated with a memory device. Based on the temperature information, the memory system may, in response to a refresh command, activate a set of access lines (e.g., word lines) to refresh memory cells coupled with the access lines, where a count of the set of access lines (e.g., how many access lines are included in the set) may be based on the temperature information. In some examples, the count of the set may be determined based on comparing the temperature information to one or more temperature thresholds.