Removable Memory Device Current Classes for Multiple Voltage Types
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Solution Overview
Problem
Existing removable memory devices face challenges in operating with multiple power types having different voltages, requiring a new technology to facilitate power supply configuration design on the host side.
Innovation Solution
The removable memory device is designed to support multiple current consumption classes, with defined current values for each power type, ensuring compliance with permissible current values through contact resistance management and voltage fluctuations, and includes a controller to manage power supply terminals and nonvolatile memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the removable memory device operates with multiple power types having different voltages, then the adaptability and versatility of the device is improved, but the device complexity and difficulty of power supply configuration design increase
Solution Approach 1:
The patent applies parameter changes by defining multiple current consumption classes (CC1-CC4) with different current consumption parameters for first and second power types. The host device selects appropriate current consumption parameters based on the actual power supply conditions, allowing the removable memory device to adapt to different voltage types (e.g., 3.3V/1.2V or 5V/1.8V) without increasing physical complexity. This resolves the contradiction by using software/firmware parameter configuration rather than hardware redesign.
2Reliability
If the current consumption values are increased to ensure stable operation, then the reliability of the device is improved, but the use of energy by the device increases
Solution Approach 1:
The patent implements dynamics by allowing the host device to dynamically select current consumption parameters based on actual power supply conditions. The system can switch between different current consumption classes (CC1-CC4) depending on voltage stability, contact resistance conditions, and operational requirements. This enables the device to use higher current only when necessary for stability, while consuming less energy under normal conditions, thus resolving the contradiction between reliability and energy consumption.
Data Source
AI summary
According to one embodiment, when a current consumption class supported by a removable memory device is another current consumption class different from a first current consumption class with a largest current consumption value among plural types of current consumption classes, the first current consumption value consumed from a first power by the removable memory device is smaller than or equal to a third permissible current value for a first power defined in the other current consumption class; and a second current consumption value consumed from a second power by the removable memory device is smaller than or equal to a fourth permissible current value for the second power defined in the other current consumption class.