Embedded Storage Buffering for Crash Data Retention
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Solution Overview
Problem
The increasing data processing demands in autonomous driving systems, particularly in volatile memory devices like DRAM, require enhanced storage capacity for temporary data retention during events such as crashes, which existing technologies struggle to address efficiently.
Innovation Solution
An embedded storage device with a volatile memory device and a nonvolatile memory device, including a buffer area and a controller, dynamically manages temporary data storage by copying data from a buffer area to a user area based on event detection signals, utilizing different cell types for efficient data retention and management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If volatile memory device is used for temporary data storage, then data access speed is improved, but data retention reliability deteriorates
Solution Approach 1:
The memory system is segmented into volatile memory device for fast temporary storage and nonvolatile memory device for reliable data retention. The controller manages data segmentation between buffer area (volatile) and user area (nonvolatile), allowing fast access when needed while ensuring reliability through nonvolatile storage capability
Solution Approach 2:
The controller acts as an intermediary between the volatile memory device and nonvolatile memory device, managing data transfer and storage decisions. It determines when to copy data from volatile to nonvolatile storage based on flush requests, balancing speed and reliability requirements
2Reliability
If nonvolatile memory device is used for temporary data storage, then data retention reliability is improved, but data access speed deteriorates
Solution Approach 1:
The nonvolatile memory device is divided into buffer area for temporary data and user area for permanent storage. This segmentation allows the system to use nonvolatile storage for reliability while maintaining fast access paths through the volatile memory buffer for active data operations
3Quantity of substance
If storage capacity is increased for autonomous driving data, then data retention capability is improved, but device complexity increases
Solution Approach 1:
The volatile memory device serves multiple functions: it acts as both a temporary data buffer during normal operations and as a fast storage medium for recently written data that needs quick access. This multi-functionality increases storage capacity utilization without proportionally increasing device complexity
Solution Approach 2:
The system dynamically adjusts data storage locations based on operational needs. The controller can move data between volatile and nonvolatile storage, and between buffer and user areas, optimizing the balance between storage capacity utilization and system complexity based on real-time requirements
Data Source
AI summary
A host system includes a volatile memory device configured to store first temporary data, an embedded storage device configured to store second temporary data, and a host device configured to determine whether to transmit new temporary data to the nonvolatile memory device for storage therein as the first temporary data or to the embedded storage device for storage therein as the second temporary data in response to a detection signal of an event associated with the new temporary data. The embedded storage device may include at least one nonvolatile memory device having a buffer area, in which the second temporary data is stored, and a user area, and a controller configured to control the at least one nonvolatile memory device such that the second temporary data in the buffer area is copied to the user area in response to a flush request of the host device.