Memory Standby Current Reduction via Dynamic Power Mode Switching
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Solution Overview
Problem
Non-volatile memory devices, such as flash memory, face challenges with high power consumption and slow operation speed due to prolonged standby modes, leading to increased latency and inefficiency in microprocessor performance.
Innovation Solution
Implementing a method to automatically switch memory devices from standby mode to power down mode after a predetermined duration of inactivity, using a counter circuit and controller to manage this transition, and toggling a data strobe signal upon data readiness, thereby reducing standby current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the memory device remains in standby mode to ensure fast access response, then access speed is improved, but power consumption increases
Solution Approach 1:
The memory device dynamically transitions between standby mode and power down mode based on activity detection. A counter circuit monitors activity and automatically switches modes, making the system adaptive rather than static. This resolves the contradiction by adjusting the operational state according to actual needs.
Solution Approach 2:
The memory device autonomously manages its own power state through an internal counter circuit and control logic that detects activity and triggers mode transitions without external intervention. This self-service mechanism eliminates the need for continuous host controller management while optimizing both power consumption and access response.
2Use of energy by moving object
If the memory device enters power down mode to reduce power consumption, then power usage is reduced, but access latency increases
Solution Approach 1:
The counter circuit performs preliminary detection of memory activity and proactively triggers the mode transition before the host needs to access the memory. By anticipating the need for power saving and preparing the power down state in advance, the system reduces overall power consumption while minimizing the impact on access latency through timely transitions.
Solution Approach 2:
The system employs periodic monitoring of memory activity through the counter circuit, which continuously checks for access requests and periodically transitions between modes. This periodic action creates a rhythm of power saving and active states that optimizes the balance between power consumption and access latency over time.
3Measurement precision
If the host controller continuously monitors memory activity to manage power states, then power management precision is improved, but device complexity increases
Solution Approach 1:
The power management functionality is extracted from the host controller and embedded directly into the memory device through a dedicated counter circuit and control logic. This extraction simplifies the host controller's role while providing precise power management within the memory device itself, resolving the contradiction by distributing complexity to where it is most effective.
Solution Approach 2:
The memory device provides self-service power management through its internal counter circuit that autonomously monitors activity and controls mode transitions. This eliminates the need for complex host controller intervention, reducing overall system complexity while maintaining precise power management through the dedicated internal circuitry.
Data Source
AI summary
A method of controlling a memory device can include: determining, by the memory device, a time duration in which the memory device is in a standby mode; automatically switching the memory device from the standby mode to a power down mode in response to the time duration exceeding a predetermined duration; exiting from the power down mode in response to signaling from a host device via an interface; and toggling a data strobe when data is ready to be output from the memory device in response to a read command from the host device.