Memory Controller Power Management for NAND Operations
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Solution Overview
Problem
Memory devices, particularly in mobile devices, face significant energy consumption challenges during prolonged operations like programming and erasing in NAND memory, where the memory controller's circuitry remains active unnecessarily, leading to wasteful energy usage.
Innovation Solution
Implementing a system suspend/wakeup operation that places a portion of the memory controller into a lower power mode during these operations and sets a wakeup time based on the predicted completion time, toggling back to active mode upon completion or receipt of another command.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the memory controller remains active during NAND programming and erasing operations, then it can respond to commands and handle operations, but energy is wasted during idle waiting periods
Solution Approach 1:
The memory controller determines in advance whether it will be the sole initiator of NAND operations before entering low power mode. This preliminary assessment allows the controller to safely transition to sleep mode during idle periods while ensuring it can be awakened if needed, resolving the contradiction between energy savings and operational readiness.
Solution Approach 2:
The memory controller dynamically transitions between active and low power modes based on real-time conditions. It monitors whether it is the sole initiator of NAND operations and adjusts its power state accordingly, enabling energy-efficient operation without compromising the ability to handle commands when required.
2Use of energy by moving object
If the memory controller enters low power mode during NAND operations, then energy consumption is reduced, but response time to handle new commands may increase
Solution Approach 1:
The memory controller uses feedback from monitoring its role as sole initiator of NAND operations to dynamically adjust its power state. When determined to be the sole initiator during idle periods, it enters low power mode; when new commands arrive or it needs to handle operations, it transitions back to active mode, optimizing both power usage and response time based on actual system conditions.
Data Source
AI summary
A memory device includes a hardware suspend mechanism configured to place a component of a memory controller into a lower power mode while a memory operation is being completed. A timer is provided to wakeup the CPU out of the lower power mode; and hardware interrupts can be used in determining to either enter or wake from the lower power mode. Memory monitoring circuitry is provided to estimate the duration of memory operations; and timers are provided to wake the component in the absence of hardware interrupts or additional commands.