Vehicle Memory Pre-Shutdown Media Management

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Solution Overview

Problem

Vehicle memory sub-systems face challenges due to varying temperature ranges, longer lifespan expectations, and increased complexity, requiring improved cross-temperature features, endurance, retention, performance, and lower access latency, especially since they are frequently powered off and rarely in idle status, unlike mobile devices.

Innovation Solution

Implementing a pre-shutdown media management operation that allows the memory sub-system to perform media management operations without interruptions from read/write requests, informing the host when ready for shutdown, thereby enhancing performance and reliability without disrupting vehicle functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the memory sub-system performs media management operations during normal operation mode, then the performance and reliability are improved, but the access latency increases and vehicle functionality is disrupted

Engineering Contradiction:

Improvememory sub-system reliabilityVSAvoidvehicle functionality availability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system performs media management operations in advance during pre-shutdown mode, before the actual shutdown occurs. This preliminary action allows the memory sub-system to complete necessary maintenance tasks without interrupting normal vehicle functionality, thereby improving reliability while maintaining ease of operation during the vehicle's active use period.

Inventive Principle:

Principle #10Preliminary action

2Use of energy by moving object

If the memory sub-system is frequently powered off to save energy, then the energy consumption is reduced, but the media management operations are interrupted and lifespan is reduced

Engineering Contradiction:

Improveenergy consumptionVSAvoidmemory sub-system lifespan

Core Design Contradiction:

Use of energy by moving objectVSDuration of action of stationary object

Solution Approach 1:

Media management operations are performed in advance during pre-shutdown mode before the power-off occurs. This ensures that necessary maintenance tasks are completed before the memory sub-system enters its inactive state, preserving lifespan while allowing frequent power-off cycles for energy savings.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The operational state is segmented into three distinct modes: normal mode for active vehicle operation, pre-shutdown mode for media management operations, and shutdown mode for power-saving. This segmentation allows the system to perform maintenance operations during pre-shutdown without interfering with either active functionality or power-saving objectives.

Inventive Principle:

Principle #1Segmentation

3Productivity

If the memory sub-system performs media management operations during normal mode, then the performance is improved, but the access latency increases

Engineering Contradiction:

Improvemedia management performanceVSAvoidaccess latency

Core Design Contradiction:

ProductivityVSSpeed

Solution Approach 1:

Media management operations are performed in advance during pre-shutdown mode, before normal operations resume. This preliminary execution of maintenance tasks ensures that the memory sub-system is optimized and ready for high-performance operations during normal vehicle use, maintaining high productivity while minimizing access latency.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11687260B2Pre-shutdown media management operation for vehicle memory sub-system

Publication Date: 2023.06.27 MICRON TECHNOLOGY INC

AI summary

A vehicle memory sub-system can be switched from a normal mode to a pre-shutdown mode and initiate a media management operation before shutting down. The mode switch and/or media management operation can be performed in response to receiving a shutdown or pre-shutdown command for the vehicle. After completion of the memory management operation the vehicle and/or memory sub-system can be shutdown.