Removable Memory Device Power Classes for Host Current Limits
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Solution Overview
Problem
Existing removable memory devices face challenges in operating with multiple power types having different voltages, requiring a standardized power supply configuration that optimizes design and reduces unnecessary costs in host devices.
Innovation Solution
The removable memory device is designed to support multiple current consumption classes, defining current limits for each power type to ensure efficient operation and minimize voltage drops, allowing for optimized power supply configurations in hosts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the removable memory device operates with multiple power types having different voltages, then the device can achieve higher performance and larger capacity, but the host device requires more complex power supply configuration and higher costs
Solution Approach 1:
The patent applies parameter changes by defining multiple current consumption classes (CC1-CC4) with different current consumption parameters for each power supply type. The host device determines the appropriate current consumption class based on its power supply capabilities, and the removable memory device operates within the permissible current values for that class. This allows the same removable memory device to be used with different host devices having different power supply configurations, resolving the contradiction between high performance and complex power supply configuration.
2Productivity
If the host device provides higher current supply capability, then the removable memory device can operate at higher performance levels, but the host device incurs higher costs and excessive capability for lower performance needs
Solution Approach 1:
The patent applies dynamics by making the current consumption class configurable and adaptable. The host device can dynamically determine which current consumption class to use based on its power supply capabilities, and the removable memory device can operate in different classes (CC1-CC4) with different current consumption characteristics. This dynamic adaptation allows the system to optimize performance according to available power supply capability, avoiding the need for all host devices to provide maximum current supply capability.
3Speed
If the removable memory device consumes more current, then the device can operate faster and handle larger capacities, but voltage drops increase and reliability decreases
Solution Approach 1:
The patent applies feedback by establishing a determination mechanism where the host device assesses its power supply capability (including contact resistance and maximum current supply) and communicates the appropriate current consumption class to the removable memory device. The removable memory device then operates within the permissible current values defined for that class, ensuring that voltage drops remain within acceptable ranges. This feedback loop maintains reliability while allowing high-speed operation when the host device has sufficient power supply capability.
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.