SATA Command Sub-tag Encoding for Administrative Data Exchange
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Solution Overview
Problem
Communication protocols like SATA have limited expandability for providing additional parameters with read/write commands, leading to inefficiencies in exchanging administrative information and handling complex mapping structures in newer storage devices such as SSDs.
Innovation Solution
The method involves using a reserved sub-tag value in commands to transmit and receive administrative information, allowing for the exchange of additional parameters beyond the standard limitations of the protocol, enabling efficient communication of status and configuration data between devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If standard SATA protocol commands are used for read/write operations, then protocol compatibility is maintained, but the ability to exchange additional administrative information is limited
Solution Approach 1:
The patent embeds administrative information within existing SATA protocol command structures by utilizing reserved bits and fields within standard command formats. This nesting approach allows additional information to be transmitted without creating separate protocol layers, maintaining compatibility while expanding functionality.
Solution Approach 2:
The patent modifies existing SATA command parameters by reinterpreting reserved bits and fields to carry administrative information. By changing the semantic meaning of existing parameter fields rather than adding new fields, the protocol maintains its original structure while gaining enhanced information exchange capabilities.
2Loss of information
If additional parameters are transmitted beyond standard protocol limits, then administrative information exchange is enhanced, but protocol compatibility may be compromised
Solution Approach 1:
The patent makes existing SATA command fields multi-functional by enabling them to carry both traditional data transfer parameters and administrative information depending on context. This universality allows a single command structure to serve multiple purposes, enhancing information exchange without requiring separate protocol paths that could compromise compatibility.
Solution Approach 2:
The patent uses reserved bits and fields as intermediaries to transmit administrative information. These intermediary elements act as carriers that do not disrupt the primary data transfer function while enabling additional information exchange, thus maintaining protocol compatibility through the use of existing structural elements.
3Adaptability or versatility
If complex mapping structures are implemented in SSD to handle additional parameters, then functional capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the complexity of parameter handling from the SSD device by implementing the enhanced parameter exchange mechanism at the protocol level using existing SATA structures. This extraction removes the need for complex internal mapping structures within the SSD, as the parameter management is handled through the communication interface using reserved fields and bits.
Data Source
AI summary
Methods and structure for transferring administrative information through a communication interface. Features and aspects hereof provide for exchanging administrative information between an initiator device and a target device using read and write commands encoded with a reserved sub-tag value. In the context of a Serial Advanced Technology Attachment (SATA) system, a portion of a parameter (e.g., the LBA parameter) of a read or write command (a Native Command Queuing command) is defined to encode a sub-tag value. One or more sub-tag values are reserved to indicate that the corresponding read or write command is related to the exchange of administrative information rather than the reading or writing of data on a storage device. A parameter value encoded in the LBA field or data length field of the read or write command indicates administrative data to be returned to the initiator or to be updated within the target device.