Memory Card Power-State Sets for Stable Stream Recording
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Solution Overview
Problem
Existing memory cards face challenges in stabilizing stream recording for extended periods due to temperature fluctuations and power consumption limitations, making it difficult for hosts to select suitable power states for optimal performance.
Innovation Solution
The memory device includes a power state set [2] specifically designed for stream recording, which allows the NVMe™ controller to manage power states and temperature, ensuring stable performance by defining a set of power states that balance power consumption and temperature thresholds, enabling the host to select appropriate power states for continuous and high-quality recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the memory device operates at high performance for extended stream recording, then the data transfer rate is improved, but the temperature increases and power consumption exceeds limits
Solution Approach 1:
The patent implements dynamic power state adjustment by introducing a power state set specifically for stream recording operations. The controller transitions between different power states (e.g., first power state for normal operations, second power state for stream recording) based on the operational mode, enabling adaptive performance management that balances speed and temperature control throughout extended recording sessions
2Ease of operation
If the memory device uses conventional power state management, then the device complexity is reduced, but the host cannot select suitable power states for optimal performance
Solution Approach 1:
The patent segments power state management into distinct power state sets - a first power state set for general operations and a second power state set specifically for stream recording. Each set contains predefined power states with different performance characteristics, allowing the host to select from organized options rather than managing a single complex power state space
3Productivity
If the memory device maintains high data transfer rates during extended recording, then the productivity is improved, but the reliability decreases due to temperature fluctuations
Solution Approach 1:
The patent implements feedback-based power state adjustment where the controller monitors operational conditions and adjusts power states accordingly. During stream recording, the system can transition between power states based on real-time temperature and performance monitoring, ensuring reliable operation while maintaining high productivity through adaptive rather than static power management
Data Source
AI summary
According to one embodiment, a memory card includes a nonvolatile memory and a controller. The controller performs initialization of an interface, determines a maximum performance that can be supported from among a plurality of performance predetermined for stream recording, based on a bus configuration of the interface determined at the interface initialization and a maximum allowable power consumption set during the interface initialization, and generates a data set stored in a power state register specified by an NVMe™ standard, which is a power state set in which each of all performance smaller than the determined maximum performance among the plurality of performance corresponds to a power state, to indicate a list of the performance which can be supported for a host.