Cascade Memory Card Initialization with Default RCA Addressing
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Solution Overview
Problem
Existing memory systems with cascade-connected memory cards face challenges in initializing the logical location and type of memory cards connected to a host processor, as they require sequential identification and unique addressing, which is inefficient without a standardized method.
Innovation Solution
A method where each memory card initially stores a default Relative Card Address (RCA) that is sequentially changed to a unique RCA by the host processor using a series of commands, allowing for efficient identification and addressing of memory cards in a cascade arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential identification method is used to initialize memory cards, then memory cards can be identified and addressed, but the initialization process becomes time-consuming and inefficient
Solution Approach 1:
The patent applies preliminary action by pre-configuring each memory card with a default Relative Card Address (RCA) value before the memory cards are inserted into the system. This default RCA allows the host processor to immediately identify and access memory cards without requiring time-consuming sequential identification procedures during initialization.
2Reliability
If unique addressing is implemented for each memory card, then data transfer reliability is improved, but the complexity of the addressing system increases
Solution Approach 1:
The patent applies parameter changes by using a single RCA parameter that can take different values to uniquely identify each memory card. The host processor changes the RCA parameter value sequentially (0, 1, 2, 3, etc.) to address different memory cards in the cascade connection, simplifying the addressing system while maintaining unique identification capability.
3Adaptability or versatility
If cascade connection arrangement is used for memory cards, then system expandability is improved, but the difficulty of detecting and measuring memory card locations increases
Solution Approach 1:
The patent introduces the Relative Card Address (RCA) as an intermediary that simplifies the detection of memory card locations in a cascade connection. Instead of directly detecting physical positions, the host processor uses the RCA intermediary to logically identify and access each memory card through standardized commands, reducing the difficulty of location detection.
Data Source
AI summary
A memory system is provided includes a host processor, and a plurality of cascade connected memory cards connected to the host processor. Each of the memory cards stores a same default relative card address (RCA) prior to initialization of the memory system. The host processor is configured to sequentially access each memory card using the default RCA, and to change the default RCA to a unique RCA upon each sequential access.