Temperature-Based Memory Programming with Dynamic Verify Cycles
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Solution Overview
Problem
Flash memory performance is impacted by temperature variations, leading to inefficiencies in write operations due to increased time required for programming and verify cycles at lower temperatures.
Innovation Solution
A storage system that dynamically adjusts clock parameters during write operations by decreasing the clock timing when the temperature is below a certain threshold, thereby modifying the duration of the verify cycle to optimize programming efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the clock timing is decreased for lower temperature operations, then the write operation duration is reduced, but the programming precision may deteriorate due to shortened verify cycles
Solution Approach 1:
The patent applies dynamics by making the clock timing parameter adjustable based on temperature conditions. The system dynamically selects between different clock timing values (first clock timing for higher temperatures, second clock timing for lower temperatures) to optimize write operation duration while maintaining programming precision through temperature-adaptive timing adjustment
Solution Approach 2:
The patent changes the clock timing parameter based on temperature readings. When temperature is at or below a threshold, the system switches to a second clock timing value that is less than the first clock timing value, thereby reducing write operation duration while adapting to temperature-induced variations in memory cell behavior
2Productivity
If the verify cycle duration is shortened to improve write speed, then productivity increases, but reliability decreases due to insufficient verification at lower temperatures
Solution Approach 1:
The patent changes the verify cycle duration parameter based on temperature conditions. By using a second clock timing value (less than the first) when temperature is at or below the threshold, the system shortens the verify cycle to improve write speed while the temperature-dependent adjustment ensures reliability is maintained by adapting to the physical characteristics of memory cells at different temperatures
3Productivity
If temperature-based timing adjustment is implemented, then write operation efficiency is improved, but device complexity increases due to temperature sensing and dynamic parameter adjustment
Solution Approach 1:
The patent implements self-service by having the memory device perform its own temperature sensing and automatically adjust its write operation timing based on the sensed temperature. The memory device independently determines when to use the first or second clock timing based on temperature threshold comparisons, eliminating the need for external controller intervention and reducing overall system complexity
Solution Approach 2:
The patent uses feedback by continuously monitoring the temperature of the memory device and using this temperature information to dynamically adjust the clock timing parameter. The temperature reading feeds back into the timing control logic, which automatically selects the appropriate clock timing (first or second) based on whether the temperature is above or below the threshold, creating a closed-loop temperature-compensation system
Data Source
AI summary
Various methods include receiving, by a controller, a temperature reading of a memory array, the temperature reading includes a temperature value; determining the temperature value is below a first threshold; in response, modifying a duration of a verify cycle of a write operation to create a modified verify cycle; then programming a first data into the memory array using the write operation that uses the modified verify cycle. Methods additionally include receiving a second temperature reading of the memory array, the second temperature reading includes a second temperature value; determining the second temperature value is below a second threshold, in response, decreasing the duration of a verify cycle of a verify cycle to create a second verify cycle, where the second verify cycle is shorter than the modified verify cycle; and then programming a second data into the memory array using the write operation that uses the second verify cycle.