Flash Memory Block Refresh Synchronization via Temperature Monitoring
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Solution Overview
Problem
Flash memory systems face inefficiencies in refresh operations due to unsynchronized pre-configuration times across memory blocks, leading to increased delays and energy consumption, particularly when temperature fluctuations cause data errors.
Innovation Solution
Implementing a method to monitor and synchronize the refresh operations of flash memory blocks based on temperature readings, allowing for overlapping pre-configuration times to align and reduce the overall time required for refresh cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If refresh operations are performed on flash memory blocks without synchronization, then each block can be refreshed independently, but the total time elapsed during refresh sequences increases and energy consumption increases
Solution Approach 1:
The patent merges refresh operations of multiple memory blocks by synchronizing their pre-configuration times. When temperature conditions indicate potential errors, the controller aligns the pre-configuration timing of multiple blocks so they are refreshed simultaneously or in overlapping time windows, reducing the total elapsed time compared to sequential independent refreshes.
Solution Approach 2:
The patent implements periodic temperature monitoring and conditional synchronization of refresh operations. The controller periodically checks temperature conditions and selectively synchronizes refresh operations based on these conditions, creating a rhythmic pattern of monitoring and synchronized refreshing that optimizes both speed and energy efficiency.
2Loss of time
If refresh operations are synchronized based on temperature monitoring, then the total time for refresh sequences is reduced, but the system complexity increases due to temperature monitoring and conditional synchronization logic
Solution Approach 1:
The patent uses temperature monitoring as a feedback mechanism to dynamically control refresh synchronization. The controller continuously monitors temperature conditions and uses this feedback to determine when to synchronize refresh operations, creating a closed-loop control system that adapts to thermal conditions without requiring complex predetermined scheduling.
Solution Approach 2:
The system performs self-service by automatically monitoring its own temperature conditions and autonomously deciding when to synchronize refresh operations. The controller manages the entire process without external intervention, detecting thermal stress conditions and initiating synchronized refreshes independently, which simplifies the overall system architecture.
3Reliability
If temperature monitoring is implemented for selective refresh synchronization, then data error prevention is improved, but energy consumption increases due to continuous temperature sensing
Solution Approach 1:
The patent changes the operational parameter from continuous temperature monitoring to periodic or conditional monitoring based on refresh cycle timing. Temperature is monitored at specific intervals or only when refresh operations are imminent, reducing the energy burden of continuous sensing while still capturing the thermal conditions necessary to determine whether synchronization is needed for error prevention.
Data Source
AI summary
An embodiment is directed to an apparatus that comprises a host controller and a flash memory. The host controller monitors a temperature in a first memory block of the flash memory (e.g., based on a reported temperature measurements from the flash memory), and selectively synchronizes a first refresh of the first memory block with a second refresh of a second memory block of the flash memory based in part upon the monitored temperature. For example, an immediate refresh of the first memory block may be performed if there is a pending I/O request for the first memory block, an error rate associated with the first memory block exceeds an error rate threshold and/or the monitored temperature of the first memory block exceeds a temperature threshold; otherwise, a synchronized refresh of the first and second memory blocks may be executed.