Nonvolatile Memory Read Sequencing Without Wordline Recovery
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Solution Overview
Problem
Nonvolatile memory devices experience increased operation time and power consumption due to setup and recovery time intervals during read operations.
Innovation Solution
A method and device that control the voltages of wordlines such that a selected wordline and unselected wordlines have the same voltage level during pending reception of a second read command, omitting the recovery operation if the command is received within a reference time interval, thereby reducing the time and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If setup time interval and recovery time interval are performed on various types of lines before and after write and read operations, then the nonvolatile memory device can operate reliably, but the amount of time used for the entire operation and power consumption increase
Solution Approach 1:
The patent applies preliminary action by controlling wordline voltages to a predetermined level before the next read command is received. This preparatory voltage control eliminates the need for recovery operations when sequential read commands are received, as the wordlines are already in the appropriate state for the next operation, thereby reducing total operation time while maintaining reliability
Solution Approach 2:
The patent implements dynamic voltage control where the control circuit adjusts wordline voltages based on the timing and type of incoming commands. When a read command is received within a predetermined time interval, the circuit dynamically determines whether recovery operations are necessary, optimizing the balance between reliability and operation speed by adapting the voltage control strategy to real-time operational conditions
2Reliability
If setup time interval and recovery time interval are performed on various types of lines before and after write and read operations, then the nonvolatile memory device can operate reliably, but power consumption increases
Solution Approach 1:
By controlling wordline voltages to a predetermined level in advance before the next read command is received, the patent eliminates the need for recovery operations. This preliminary voltage control reduces power consumption by avoiding unnecessary voltage transitions and recovery cycles, while ensuring the wordlines are already in the appropriate state for reliable operation
Solution Approach 2:
The patent changes the voltage parameter of wordlines to a predetermined level during the pending period. This parameter adjustment reduces power consumption by maintaining voltages at optimal levels without requiring full recovery cycles, thereby reducing energy usage while preserving operation reliability
3Stability of the object's composition
If recovery operation is performed after each read operation, then the wordlines are properly initialized, but the read operation speed decreases
Solution Approach 1:
The control circuit performs preliminary voltage control on wordlines during the pending period before the next read command is received. This preliminary action ensures wordlines are already in the appropriate voltage state when the next read operation begins, eliminating the need for recovery operations and thereby increasing read operation speed while maintaining voltage stability
Solution Approach 2:
The patent maintains continuous useful action by keeping wordline voltages controlled at predetermined levels during the pending period. This continuous voltage control eliminates idle recovery operations, allowing the system to maintain readiness for the next read operation without interruption, thereby improving read speed while preserving voltage stability
Data Source
AI summary
In a method of reading data from a nonvolatile memory device, a first sensing operation is performed based on a first read command. While pending reception of a second read command after the first read command, voltages of a plurality of wordlines are controlled such that a voltage of a selected wordline and voltages of unselected wordlines among the plurality of wordlines have a same voltage level. A recovery operation is omitted when the second read command is received within a reference time interval. A second sensing operation is performed based on the reception of the second read command.