Memory Controller Block Mapping for Consistent Superblock Writes
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Solution Overview
Problem
Existing memory systems face challenges in maintaining write consistency due to fluctuations in write rates, particularly when unavailable blocks are concentrated in certain superblocks, leading to reduced service life and performance.
Innovation Solution
The method involves mapping physical block numbers to logical numbers using a cyclic shift pattern to distribute unavailable blocks evenly across superblocks, ensuring consistent write rates by grouping blocks based on logical numbers rather than physical numbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If blocks are grouped into superblocks based on physical numbers, then the memory structure is simple and easy to manage, but unavailable blocks concentrate in certain superblocks causing write rate fluctuations
Solution Approach 1:
The patent introduces a logical number dimension to complement the existing physical number dimension. Blocks are identified by both physical numbers (for hardware mapping) and logical numbers (for superblock grouping). This dimensional transformation allows unavailable blocks to be distributed across different superblocks based on logical numbers while maintaining the simplicity of physical number-based hardware addressing.
Solution Approach 2:
The logical number serves as an intermediary between the physical block number and the superblock grouping. Instead of directly grouping blocks by physical numbers, the system first maps physical numbers to logical numbers, then groups blocks by logical numbers. This intermediary layer distributes unavailable blocks evenly across superblocks while preserving the simple physical number structure at the hardware level.
2Reliability
If over-provisioning is increased to handle write rate fluctuations, then write consistency is improved, but service life and read-write performance are reduced
Solution Approach 1:
The system performs preliminary mapping of physical block numbers to logical block numbers before superblock formation. This advance mapping ensures that unavailable blocks are pre-distributed across different superblocks, preventing write rate fluctuations before they occur. By addressing the distribution issue in advance, the system maintains write consistency without requiring excessive over-provisioning, thus preserving read-write performance.
Solution Approach 2:
The patent changes the grouping parameter from physical block numbers to logical block numbers. This parameter transformation fundamentally alters how blocks are organized into superblocks, distributing unavailable blocks evenly across the memory space. The change in grouping parameter eliminates write rate fluctuations without sacrificing productive capacity, as logical numbers provide a virtual layer that doesn't consume additional physical resources.
Data Source
AI summary
The present application discloses an operation method of a memory controller, a device, and a storage medium. The controller is coupled to at least one memory, and the memory includes a plurality of planes each including a plurality of blocks. The method includes: acquiring physical numbers of N blocks in the at least one memory; mapping a physical number of each of the N blocks according to a global number of a plane in which each of the N blocks is located, so as to obtain a logical number of each of the N blocks; and grouping the N blocks according to the logical number of each of the N blocks to obtain at least two superblocks. The above method may map at least two blocks having the same physical number to different logical numbers.