Flash Memory Page Identity Code for Power Loss Recovery
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Solution Overview
Problem
Flash memory access control in portable devices is challenged by incomplete data writes due to power disruptions, leading to unstable memory units and potential reading errors, even after power is restored.
Innovation Solution
A method for accessing flash memory that involves writing a data stream into pages with identity codes, allowing the controller to determine the last page written before power disconnection and using error correction codes to ensure data integrity upon reconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory controller sequentially writes updated data into pages of a data block, then data can be stored in flash memory, but if power is disconnected during writing, incomplete data remains in the page causing unstable memory units and potential reading errors
Solution Approach 1:
The patent applies preliminary action by writing identity codes to each page before data writing operations. When power is restored after disconnection, the controller reads these pre-written identity codes to determine which pages were successfully written, allowing it to identify and discard incomplete data pages without complex recovery procedures
Solution Approach 2:
The patent implements feedback by using identity codes as markers that provide information about the writing state of each page. The controller continuously monitors and reads these identity codes to feedback on which pages contain complete data versus incomplete data, enabling reliable data integrity verification after power restoration
2Measurement precision
If the memory controller determines data completeness by reading pages after power restoration, then it can identify complete data, but this process may still result in reading errors from pages with vague data errors
Solution Approach 1:
The patent applies preliminary action by pre-writing identity codes to each page during the data writing process. These identity codes serve as advance markers that allow the controller to definitively identify which pages were successfully written before power disconnection, eliminating the need to rely on error-prone post-restoration reading to determine data completeness
Data Source
AI summary
A method for accessing a flash memory includes: writing a data stream into at least a page of at least one data block of the flash memory, where each page of the data block includes an identity code; reading at least one identity code of the page; and determining a specific page according to at least the identity code, where the specific page is a last page that the data stream is written to before the flash memory is disconnected from a power source.