Dynamic Pass-Through Voltage Adjustment for Memory Read Disturb
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Solution Overview
Problem
Memory sub-systems face performance degradation due to read disturb caused by constant read operations, leading to increased error rates and reduced performance, as the pass-through voltage remains static despite shifting threshold voltages in memory cells.
Innovation Solution
A memory sub-system controller adjusts the pass-through voltage based on threshold voltage shifts by using metadata tables to determine appropriate voltage offsets, reducing read disturb and maintaining performance by lowering the pass-through voltage in response to shifting voltage distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a static pass-through voltage is used during read operations, then the read operation can be performed with simple control logic, but read disturb errors increase and performance degrades due to threshold voltage shifts
Solution Approach 1:
The patent applies dynamics by transitioning from a static pass-through voltage to a dynamic adjusted pass-through voltage that changes based on threshold voltage shifts. The controller monitors threshold voltage shifts and adjusts the pass-through voltage accordingly, making the voltage adaptive to changing memory cell conditions rather than fixed, thereby reducing read disturb errors while maintaining manageable control complexity through systematic adjustment protocols
Solution Approach 2:
The patent implements parameter changes by modifying the pass-through voltage parameter in response to detected threshold voltage shifts. Instead of keeping the pass-through voltage constant, the system changes this critical parameter dynamically to compensate for threshold voltage drift, ensuring reliable read operations while avoiding the complexity of complete system redesign
2Reliability
If the pass-through voltage is kept high to ensure proper wordline activation, then read operations can be performed reliably, but read disturb errors increase and power consumption rises
Solution Approach 1:
The patent changes the pass-through voltage parameter from a fixed high value to a dynamically adjusted value that adapts to threshold voltage shifts. By lowering the pass-through voltage when threshold voltages shift downward, the system maintains sufficient wordline activation reliability while reducing the harmful read disturb effects and power consumption associated with consistently high voltage levels
Solution Approach 2:
The patent implements feedback by monitoring threshold voltage shifts and using this information to adjust the pass-through voltage. This closed-loop approach ensures that the pass-through voltage is optimized based on actual memory cell conditions, maintaining reliable wordline activation while minimizing read disturb errors and power consumption through data-driven voltage adjustment
3Productivity
If read operations are performed frequently to maintain data accessibility, then system performance is improved, but threshold voltage shifts accumulate causing increased error rates
Solution Approach 1:
The patent adjusts the pass-through voltage parameter in response to cumulative threshold voltage shifts that result from frequent read operations. This dynamic parameter adjustment compensates for the progressive voltage drift caused by read disturb, allowing high-frequency data access to maintain performance while preventing the accumulation of errors that would otherwise occur with static voltage control
Data Source
AI summary
Systems and methods are disclosed including a memory device and a processing device operatively coupled to the memory device. The processing device can perform operations including performing a read operation on a block of the memory device by applying a read reference voltage to a selected wordline of the block and applying a pass-through voltage having a first value to a plurality of unselected wordlines of the block; detecting a read error in response to performing the read operation; and setting the pass-through voltage to a second value, wherein the second value is greater than the first value.