Memory Sub-System Modulation for Uniform Data Distribution
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Solution Overview
Problem
Existing memory systems face challenges in managing cell-to-cell interference and premature degradation due to deterministic data patterns, leading to increased read bit error rates and reduced endurance.
Innovation Solution
A memory sub-system performs modulation operations based on the number of pages in a block, using a seed value generated from a portion of the page address to enhance randomness, distributing write data uniformly across memory cells and reducing overuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If deterministic data patterns are used for writing memory data, then the programming process is simple and fast, but cell-to-cell interference increases and memory cells experience premature degradation
Solution Approach 1:
The patent applies dynamics by making the data pattern dynamic rather than deterministic. The modulation component varies the data pattern across different memory cells using a seed value and comparison logic, ensuring that identical data values are programmed with different patterns in different cells. This dynamic approach distributes stress evenly across the memory array, preventing premature degradation while maintaining programming efficiency.
Solution Approach 2:
The patent changes the parameter of data pattern from deterministic to randomized/modulated. By introducing a seed value and using comparison operations to generate varied patterns, the system transforms the programming process to use different voltage application patterns for different memory cells, reducing cell-to-cell interference and improving overall reliability without significantly impacting programming speed.
2Ease of operation
If deterministic data patterns are used for writing memory data, then the programming operation is straightforward, but read bit error rates increase due to cell-to-cell interference
Solution Approach 1:
The system uses dynamic data patterns generated through comparison operations between data bits and seed values. This dynamic modulation ensures that adjacent memory cells receive different programming patterns, reducing the cell-to-cell interference that degrades read accuracy. The approach maintains operational simplicity by using basic comparison logic rather than complex programming sequences.
Solution Approach 2:
The patent implements a streamlined modulation process that quickly generates varied patterns through simple comparison operations. Rather than using complex, time-consuming programming sequences, the system rapidly modulates data patterns based on seed values and bit comparisons, achieving both ease of operation and improved read accuracy by skipping the intermediate step of complex pattern generation.
3Productivity
If uniform data patterns are applied to all memory cells, then the programming process is efficient, but voltage distribution becomes uneven causing premature degradation
Solution Approach 1:
The patent applies local quality by tailoring the data pattern to each memory cell's specific location and characteristics. Using the seed value in combination with comparison operations, the system generates unique patterns for different cells, ensuring that voltage is distributed more uniformly across the memory array. This localized approach maintains programming efficiency while improving voltage distribution stability.
Solution Approach 2:
The system introduces asymmetry by using different data patterns for different memory cells rather than applying uniform patterns. The comparison between data bits and seed values generates asymmetric patterns that naturally balance the voltage distribution across the memory array, preventing the premature degradation caused by uneven voltage stress while maintaining programming efficiency.
Data Source
AI summary
Systems and methods are disclosed including a memory device and a processing device, operatively coupled with the memory device, to perform operations comprising: receiving a write command to store data on the memory device; identifying a block of the memory device referenced by the write command; identifying, based on a number of pages in the block, a number of bits of an address referenced by the write command; generating a seed value by performing one or more transformation operations on a subset of bits comprising the identified number of bits of the address; generating an output sequence using the seed value; generating modulated data by performing one or more bitwise operations on the output sequence and the data; and storing, in the block of the memory device, the modulated data.