In-Vehicle Detection System Nonvolatile Memory Controller
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Solution Overview
Problem
Conventional in-vehicle detection systems face challenges with increased memory capacity requirements due to high-accuracy and large-capacity sensors, leading to restricted mounting flexibility and prolonged standby times as they necessitate additional volatile memory, such as DRAM, which increases substrate area and power-on data transfer times.
Innovation Solution
The system employs a nonvolatile memory with a controller that adjusts writing times and clock cycles based on environmental conditions, such as temperature and rewriting frequency, to enhance performance without the need for additional volatile memory, allowing direct data access and retention during power shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If DRAM is mounted as work memory in conventional in-vehicle detection systems, then data processing speed is improved, but memory capacity increases and substrate area expands
Solution Approach 1:
The patent merges the work memory function directly into the nonvolatile memory device by integrating a memory controller that can perform read/write operations on nonvolatile memory cells. This eliminates the need for separate DRAM work memory, reducing substrate area while maintaining data processing capability through direct nonvolatile memory access.
Solution Approach 2:
The nonvolatile memory device is designed to serve multiple functions: it acts as both permanent storage and work memory by implementing a memory controller that enables random read/write operations. This multi-functionality eliminates the need for dedicated DRAM work memory, reducing overall memory capacity requirements and substrate area.
2Productivity
If additional volatile memory is mounted to handle large sensor data, then data processing capability is improved, but power consumption increases
Solution Approach 1:
The patent extracts the volatile memory component from the system by implementing work memory functionality directly within the nonvolatile memory device. This eliminates the need for separate DRAM modules, reducing power consumption associated with volatile memory operations while maintaining data processing capability through integrated nonvolatile memory access.
3Speed
If DRAM is used as work memory, then data access speed is improved, but system complexity increases
Solution Approach 1:
The patent combines the memory storage and work memory functions into a single nonvolatile memory device with an integrated memory controller. This reduces system complexity by eliminating the need for separate DRAM work memory and associated control logic, while maintaining data access speed through direct nonvolatile memory operations.
4Quantity of substance
If nonvolatile memory is used without performance optimization, then memory capacity is reduced, but retention performance degrades at high temperature
Solution Approach 1:
The patent implements dynamic writing time adjustment based on temperature conditions. The memory controller monitors temperature and extends the writing time of nonvolatile memory when temperature exceeds 50°C to ensure adequate data retention. This dynamic adaptation maintains reliability across varying thermal conditions while preserving the benefits of nonvolatile memory capacity reduction.
Solution Approach 2:
The patent changes the writing time parameter of the nonvolatile memory based on temperature conditions. When temperature exceeds 50°C, the controller extends the writing time to ensure proper data programming and retention. This parameter adjustment maintains reliability without requiring additional memory capacity or volatile work memory.
Data Source
AI summary
In-vehicle detection system includes nonvolatile memory, a controller (SoC) that reads and writes data from and in nonvolatile memory, and detector that outputs detection information to SoC. SoC changes a control signal of nonvolatile memory in accordance with the output of detector.