Integrated Memory Management Device for NAND Flash Bad Block Control
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Solution Overview
Problem
Conventional memory management systems face challenges in optimizing operations across different memory hierarchies, particularly in managing NAND type flash memory, which leads to difficulties in controlling bad blocks and achieving efficient data access and storage.
Innovation Solution
An integrated memory management device that includes an acquiring unit, an address conversion unit, and a transmission unit, which acquires logical addresses, converts them into physical addresses, and transfers data between non-volatile main memory and cache memory, optimizing data access and storage by simplifying operations and managing memory hierarchies effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional memory management systems use multiple memory hierarchies (cache memory, main memory, NAND flash memory), then data access speed is improved through caching, but device complexity and operational difficulty increase due to managing multiple hierarchies
Solution Approach 1:
The patent combines cache memory and NAND flash memory into a single integrated memory device. The controller manages both memory types as one unified system, eliminating the need for separate memory hierarchy management. This merging maintains fast data access through caching while simplifying the system by presenting a single memory interface to the host device.
Solution Approach 2:
The integrated memory device serves multiple functions within a single package: it provides both high-speed caching capabilities and non-volatile storage functionality. The controller dynamically manages data placement between cache and flash memory based on access patterns, enabling the single device to fulfill roles that previously required multiple separate memory components.
2Reliability
If conventional systems separate cache memory and NAND flash memory management, then each memory type can be optimized independently, but control of bad blocks and wear leveling becomes difficult
Solution Approach 1:
By integrating cache memory and NAND flash memory under a single controller, the system enables unified management of bad blocks and wear leveling. The controller can track the health status of both memory types simultaneously and implement coordinated error correction and data relocation strategies, improving reliability while simplifying bad block control.
Solution Approach 2:
The integrated controller continuously monitors the status of both cache and flash memory regions, including detecting bad blocks and wear levels. Based on this feedback, the controller dynamically adjusts data placement, performs wear leveling, and relocates data from deteriorating memory cells, thereby maintaining high reliability while automating what would otherwise be complex manual management tasks.
3Adaptability or versatility
If the MPU executes operations across multiple memory hierarchies, then comprehensive memory management is achieved, but productivity decreases due to the number of operations required
Solution Approach 1:
The patent merges cache memory and NAND flash memory into a single integrated device, reducing the number of cross-hierarchy operations the MPU must execute. The unified memory interface allows the processor to access both fast cache and non-volatile storage through a single memory management pathway, maintaining versatility in data access patterns while significantly improving operation efficiency by eliminating redundant hierarchy transitions.
Data Source
AI summary
An integrated memory management device according to an example of the invention comprises an acquiring unit acquiring a read destination logical address from a processor, an address conversion unit converting the read destination logical address into a read destination physical address of a non-volatile main memory, an access unit reading, from the non-volatile main memory, data that corresponds to the read destination physical address and has a size that is equal to a block size or an integer multiple of the page size of the non-volatile main memory, and transmission unit transferring the read data to a cache memory of the processor having a cache size that depends on the block size or the integer multiple of the page size of the non-volatile main memory.