Memory Controller Thermal Management via Dynamic Power Mode Switching
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Solution Overview
Problem
Nonvolatile semiconductor memory systems, such as SSDs, face high failure occurrence rates due to temperature-related issues like electromigration, which existing technologies have not adequately addressed by efficiently managing power consumption and operation settings based on temperature parameters.
Innovation Solution
A memory system that includes a nonvolatile semiconductor memory, a controller, and a temperature sensor, which calculates a temperature parameter over time and dynamically switches between operation settings with varying power consumption to prevent increased operating temperatures, thereby reducing failure rates by prioritizing data transfer efficiency or power reduction based on temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the nonvolatile semiconductor memory operates at high speed, then data transfer efficiency is improved, but temperature increases causing electromigration and failure
Solution Approach 1:
The patent implements dynamic operation mode switching between high-speed and low-power modes based on real-time temperature monitoring. The controller adjusts the operating speed of the nonvolatile semiconductor memory according to temperature conditions, transitioning from high-speed operation when temperature is acceptable to low-power operation when temperature exceeds thresholds, thereby preventing electromigration while maintaining optimal performance when conditions permit
Solution Approach 2:
The patent employs a feedback mechanism where temperature sensors continuously monitor the operating temperature of the nonvolatile semiconductor memory, and the controller uses this temperature information to adjust operation modes. This closed-loop feedback system ensures that high-speed operation is maintained only when temperature conditions allow, automatically reducing speed when temperature approaches dangerous levels to prevent electromigration and failure
2Reliability
If the operation speed is reduced to lower temperature, then reliability is improved, but data transfer efficiency decreases
Solution Approach 1:
The system dynamically adjusts operation speed based on temperature conditions, maintaining high-speed operation when temperature is within safe limits to maximize data transfer efficiency, and only reducing speed when temperature exceeds thresholds to prevent electromigration. This dynamic adaptation ensures optimal performance is maintained as long as reliability conditions are met
Solution Approach 2:
The patent changes the operating parameter (speed) of the nonvolatile semiconductor memory based on temperature conditions. By switching between multiple operation modes with different speed characteristics, the system optimizes the balance between data transfer efficiency and temperature control, maintaining high efficiency when possible and reducing speed only when necessary to prevent thermal damage
3Use of energy by stationary object
If power consumption is reduced, then temperature is controlled, but operation performance decreases
Solution Approach 1:
The controller dynamically switches between operation modes with different power consumption characteristics based on temperature monitoring. When temperature is within acceptable ranges, the system operates at high performance modes with higher power consumption. When temperature exceeds thresholds, the system transitions to low-power modes that consume less energy and generate less heat, creating a dynamic balance between performance and power management
Solution Approach 2:
The temperature monitoring system provides continuous feedback to the controller, which adjusts power consumption levels accordingly. The feedback loop ensures that power is consumed at high levels only when temperature conditions permit optimal performance, and automatically reduces power consumption when temperature approaches dangerous levels, thereby controlling thermal conditions while maintaining optimal operation when possible
Data Source
AI summary
A memory system includes a nonvolatile semiconductor memory, a controller that controls the nonvolatile semiconductor memory, and a temperature sensor that acquires an operating temperature of at least one of the nonvolatile semiconductor memory and the controller. The controller calculates a temperature parameter based on operating temperatures acquired by the temperature sensor over a period of time, and switches between a plurality of operation settings in which electric power consumptions of the memory system vary, based on the temperature parameter.