Memory Device Channel Initialization for Read Disturb
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Solution Overview
Problem
Memory devices experience a read disturb phenomenon due to hot holes remaining in channels during read operations, which can lead to reduced performance and speed, especially during multi-plane read operations where power voltage drops may hinder channel initialization.
Innovation Solution
A memory device that adjusts the channel initialization period based on the read mode, setting it shorter for single-plane read operations and longer for multi-plane read operations to effectively remove hot holes and improve read disturb phenomena while maintaining read operation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the channel initialization operation is performed with a fixed activation time for all read operations, then the read operation can be completed quickly, but hot holes remain in the channel during multi-plane read operations causing read disturb phenomenon
Solution Approach 1:
The patent applies dynamics by making the activation time of the channel initialization operation variable rather than fixed. The control logic dynamically adjusts the activation time based on the read mode: using a first (shorter) activation time for single-plane read operations and a second (longer) activation time for multi-plane read operations. This dynamic adjustment resolves the contradiction by adapting the initialization duration to the specific operational context, ensuring reliable hot hole removal without unnecessarily extending read operation time.
Solution Approach 2:
The patent implements parameter changes by modifying the activation time parameter of the channel initialization operation based on different read modes. The control logic detects whether the read operation is single-plane or multi-plane and accordingly changes the activation time parameter to optimize both read disturb prevention and operation speed. This parameter adaptation allows the system to maintain reliability across different operational scenarios while minimizing time loss.
2Reliability
If the activation time of channel initialization operation is extended to remove hot holes effectively, then read disturb phenomenon is reduced, but read operation speed decreases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by adjusting the activation time parameter according to read mode requirements. For single-plane read operations where hot hole accumulation is less severe, a shorter activation time is used to maintain high speed. For multi-plane read operations where hot holes accumulate more significantly, a longer activation time is applied to ensure reliable hot hole removal. This conditional parameter adjustment optimizes both speed and reliability.
Solution Approach 2:
The system employs dynamics by making the activation time flexible and adaptive rather than static. The control logic dynamically selects the appropriate activation time duration based on the detected read mode, allowing the channel initialization operation to be short when speed is critical and long when reliability is paramount. This dynamic behavior eliminates the need to choose between speed and reliability.
3Reliability
If power voltage is maintained at high level during multi-plane read operations, then channel initialization is effective, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the power voltage level adaptive rather than constant. The control logic dynamically adjusts the power voltage applied to the channel initialization operation based on the read mode: applying a first power voltage level for single-plane reads and a second (different) power voltage level for multi-plane reads. This dynamic power management ensures effective channel initialization when needed while reducing unnecessary power consumption during single-plane operations.
Solution Approach 2:
The system implements parameter changes by modifying the power voltage parameter according to operational requirements. For multi-plane read operations where effective channel initialization is critical, the power voltage is adjusted to an appropriate level to ensure reliable hot hole removal. For single-plane operations, the power voltage is set to a lower or optimized level to minimize power consumption. This conditional parameter adjustment balances initialization effectiveness with energy efficiency.
Data Source
AI summary
A memory device, a memory system including the memory device, and a method of operating the memory device are described. The memory device includes a memory cell array including a plurality of planes, a peripheral circuit configured to perform a read operation including a channel initialization operation on a selected memory block among a plurality of memory blocks included in each of the plurality of planes, and a control logic configured to control the peripheral circuit to perform the read operation including the channel initialization operation, and the control logic sets an activation time of the channel initialization operation based on an read mode of the read operation.