Memory Control Circuit Unit Status Check for Rewritable Non-Volatile Memory
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Solution Overview
Problem
In rewritable non-volatile memory modules, data written to a physical page can inadvertently be written to other pages due to 'word line short,' leading to reduced data accuracy over time as these pages are repeatedly written.
Innovation Solution
A data writing method that checks the status of a physical programming unit before writing data, allowing the write operation only if the status meets a specific condition, thereby preventing repeated writing to the same unit and maintaining data accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data is written to a physical page in rewritable non-volatile memory module, then the storage capacity is utilized, but data accuracy deteriorates due to repeated writing caused by word line short
Solution Approach 1:
The patent performs a preliminary status check on the physical programming unit before executing the write operation. The memory control circuit unit checks whether the physical programming unit is in an erased state using a read command before writing data. This preliminary action prevents inadvertent writing to already-programmed pages, thereby avoiding repeated writing and maintaining data accuracy while still utilizing storage capacity.
2Reliability
If status checking is performed before write operation, then data accuracy is maintained, but operation complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the memory control circuit unit reads the status of the physical programming unit before writing and uses this feedback information to decide whether to proceed with the write operation. The system continuously monitors the state of memory pages and adjusts writing operations accordingly, preventing inadvertent writes while maintaining a relatively simple operational framework through standardized read-before-write sequences.
Data Source
AI summary
A data writing method, a memory storage device, and a memory control circuit unit are provided. The method includes: receiving a write command from a host system, and the write command including first data; checking a status of a first physical programming unit in a first physical erasing unit; in response to the status of the first physical programming unit being a first status, sending a first command sequence to a rewritable non-volatile memory module, and the first command sequence being configured to instruct the rewritable non-volatile memory module to store at least part of the first data to the first physical programming unit.