Memory Controller Write Log Buffering for Nonvolatile Endurance
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Solution Overview
Problem
Existing semiconductor memory devices face challenges in efficiently managing data write operations between volatile and nonvolatile memory devices, particularly in maintaining data integrity and reducing the number of write operations on nonvolatile devices, which affects endurance and performance.
Innovation Solution
A method is introduced where a controller senses write commands and generates write logs for both volatile and nonvolatile memory devices, storing them in a buffer. The logs include flags indicating whether data should be stored in the nonvolatile device, allowing for selective and delayed data transfer, reducing unnecessary write operations and enhancing data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If write operations are performed on nonvolatile memory devices for every write command to volatile memory devices, then data integrity between volatile and nonvolatile devices is maintained, but the number of write operations on nonvolatile devices increases, reducing their endurance and performance
Solution Approach 1:
A buffer is introduced as an intermediary component between volatile and nonvolatile memory devices. The buffer stores write logs temporarily, allowing the system to batch and selectively transfer data to nonvolatile memory only when necessary, rather than performing write operations for every volatile memory write command. This mediator approach maintains data integrity while significantly reducing wear on nonvolatile memory devices.
Solution Approach 2:
The system performs preliminary actions by generating and storing write logs in the buffer before actually transferring data to nonvolatile memory. The controller prepares the data in advance, sets appropriate flags indicating whether data should be stored in nonvolatile memory, and only executes the actual write operation when conditions are met. This preliminary preparation reduces unnecessary write operations and extends nonvolatile memory endurance.
2Duration of action of stationary object
If write logs are stored in a buffer for selective data transfer, then the number of write operations on nonvolatile devices is reduced, but the complexity of data management increases due to buffer management requirements
Solution Approach 1:
The buffer management system operates autonomously to handle the complexity of data management. The controller automatically generates write logs, sets appropriate flags based on data characteristics, and manages the buffer contents without requiring complex external intervention. This self-service approach encapsulates the management complexity within the buffer system while presenting a simplified interface to the rest of the memory subsystem.
3Reliability
If all write data is immediately transferred to nonvolatile memory devices, then data loss is prevented in case of power failure, but the performance and efficiency of the memory system decreases due to increased write operations
Solution Approach 1:
The system applies different quality treatments to different data based on their characteristics. By setting flags that indicate whether specific data should be stored in nonvolatile memory, the system selectively applies data persistence only where necessary, rather than uniformly transferring all data. This local quality approach maintains data loss prevention for critical data while preserving system performance by avoiding unnecessary writes of non-critical data.
Data Source
AI summary
In a method of operating a memory device, a first write command, a first write address, and first write data are received by a first memory device through a channel. The first write command, received by the first memory device, is sensed by a controller. The controller is connected to the channel and controls a second memory device. The first memory device and the second memory device are different types of memory devices. When the first write command is sensed by the controller, a first write log is generated using the first write address and the first write data. The first write log is stored into a buffer.