Dual Interface Memory Card Indentation Protocol Compatibility
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Solution Overview
Problem
The evolution of memory card standards has led to compatibility issues, where newer generation cards with different interfaces are not compatible with older hosts, causing user frustration and increased costs due to the need for adapters or mechanical differentiation, and there is a lack of clear indication of compatibility, leading to 'illegal' card-host combinations.
Innovation Solution
A dual interface memory card with a mechanical structure that includes an indentation to differentiate between legacy and new protocols, allowing the card to be inserted into compatible hosts while preventing insertion into hosts that do not support the legacy protocol, and an automatic mechanism within the host to distinguish between old and new cards, enabling user selection of the appropriate interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a memory card supports multiple protocols with different contact sets, then compatibility with both legacy and new hosts is improved, but the device complexity increases due to multiple contact sets and protocols
Solution Approach 1:
The memory card is designed with dual interface capability, incorporating both legacy protocol contacts and new protocol contacts on the same card. This allows a single card to function with both legacy hosts and new hosts, eliminating the need for separate cards for different protocols and thereby reducing overall system complexity despite the increased card design complexity
Solution Approach 2:
The contact interface is segmented into distinct legacy protocol contacts and new protocol contacts. This segmentation allows the host to selectively engage with the appropriate contact set based on the host's protocol capability, enabling protocol-specific operation while maintaining physical integration on a single card
2Ease of operation
If mechanical differentiation structures like indentations are added to memory cards, then ease of operation is improved by preventing illegal combinations, but the manufacturing precision requirements increase
Solution Approach 1:
An indentation is added to one specific edge of the memory card to create an asymmetric mechanical feature. This asymmetric feature serves as a clear visual and physical indicator of the card's protocol capability, enabling users to easily identify compatible hosts without requiring complex markings or labels, while the indentation itself remains a simple manufacturing feature
3Adaptability or versatility
If adapters are used to bridge legacy and new protocols, then adaptability is improved, but device complexity and cost increase due to additional components
Solution Approach 1:
The memory card integrates both legacy and new protocol interfaces directly into its design, making the card itself universal rather than requiring external adapters. This eliminates the need for separate adapter devices, reducing system component count and simplifying the overall architecture while maintaining compatibility with both legacy and new hosts
Data Source
AI summary
A memory card includes a first set of contacts and a second set of contacts. A first edge of the memory card includes an indentation. Insertion of the memory card into a first slot of a host device engages the first set of contacts. The indentation is configured to accept a pivoting lever arm located in the first slot when the memory card is inserted into the first slot.