DRAM-NAND Hibernation Data Migration via Image Reconstruction
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Solution Overview
Problem
Current devices face challenges in quickly resuming operations from a hibernation state while storing data for extended periods with minimal power consumption, as DRAM memory provides fast operations but high power consumption, and NAND memory offers long-term data storage at the cost of slower operations.
Innovation Solution
A system and method that utilize a controller to switch data between DRAM and NAND memory, where DRAM is used for fast operations while awake and NAND for hibernation, by generating image data of DRAM content before hibernation, storing it in NAND, and reconstructing it upon waking, with delta updates for subsequent hibernations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If DRAM memory is used to quickly resume operations from hibernation, then the resume speed is improved, but power consumption increases
Solution Approach 1:
The patent divides the memory system into two segments: DRAM for fast temporary storage during active operations, and NAND for long-term data retention during hibernation. This segmentation allows each memory type to be optimized for its specific function, with DRAM providing quick resume capability and NAND providing low power consumption during idle states.
Solution Approach 2:
Before entering hibernation mode, the system performs preliminary actions by copying data from DRAM to NAND memory. This advance preparation ensures that when the device wakes from hibernation, the data is already available in NAND, enabling fast resume without requiring DRAM to maintain data during the hibernation period.
2Use of energy by moving object
If NAND memory is used to store data during hibernation, then power consumption is reduced, but operation speed decreases
Solution Approach 1:
The system dynamically switches between DRAM and NAND memory based on the operational state. During active mode, DRAM is used for fast operations. During hibernation, the system transitions to NAND memory for data storage, accepting slower speeds in exchange for dramatically reduced power consumption. This dynamic adaptation allows the system to optimize for the current operational requirements.
Solution Approach 2:
The system creates copies of data in both DRAM and NAND memory, with each copy serving a different purpose. DRAM holds the active working set for fast access during operations, while NAND stores a duplicate for long-term retention during hibernation. This copying strategy enables the system to leverage the speed of DRAM when needed and the power efficiency of NAND when idle.
3Speed
If data is copied between DRAM and NAND memory, then both speed and power efficiency are achieved, but device complexity increases
Solution Approach 1:
The controller is designed with multi-functionality, handling both DRAM and NAND memory operations, data copying, and state management. This universal controller consolidates the complexity into a single component that can adapt its behavior based on the operational state, rather than requiring separate specialized systems for each memory type.
Data Source
AI summary
The present application is directed to systems and methods for managing data in a device for hibernation states. In one implementation, the device includes an interface and a processor. The interface is coupled with a first memory and a second memory. The processor is in communication with the first and second memories via the interface. The processor is configured to read first data from the first memory, generate image data of the data stored in the first memory based on the first data, and write to the second memory prior to the device entering an initial hibernation state the image data of the data stored in the first memory. The processor is further configured to, after the device awakes from the initial hibernation state, read the image data from the second memory, reconstruct the first data based on the image data, and write the first data to the first memory.