Storage Device Switch Control for SAS Standard Compatibility
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Solution Overview
Problem
Conventional storage devices face challenges in compatibility with host devices of different SAS standards, leading to issues with power supply and switch control, resulting in defective operations when connected to servers with varying specifications.
Innovation Solution
The storage device incorporates a switch control unit that adjusts the connection and disconnection status of power switches based on the electrical statuses of pins P1 to P3, ensuring compatibility with SAS1, SAS2, SAS2.1, and SAS3 standards by using a logical circuit to generate signals for switching the switches SW1 and SW2, thereby maintaining expected power supply states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the storage device uses a fixed power supply configuration, then it works reliably with one SAS standard, but it becomes incompatible with other SAS standards (SAS1, SAS2, SAS2.1, SAS3)
Solution Approach 1:
The power supply configuration is made dynamic through switches SW1 and SW2 that can be controlled to connect or disconnect power supply paths based on the detected SAS standard. The switch control unit changes the power supply state dynamically according to the host device type, allowing the same storage device to adapt to different SAS standards (SAS1, SAS2, SAS2.1, SAS3) with different power requirements.
2Adaptability or versatility
If the storage device connects to hosts with different SAS standards, then versatility is improved, but unexpected disconnections and defective operations occur
Solution Approach 1:
The switch control unit implements feedback by detecting the electrical status of pins P1 to P3 to identify the SAS standard, then automatically adjusting the switch states to maintain proper power supply. This closed-loop control ensures the storage device operates reliably across different SAS standards by continuously monitoring and adapting to the connected host device type.
Solution Approach 2:
The switch control unit acts as an intermediary between the host device interface and the power supply unit. It detects the SAS standard through the interface and controls the switches to mediate the power supply connection, ensuring appropriate power delivery for each SAS standard variant and preventing unexpected disconnections.
3Adaptability or versatility
If the storage device uses different power supply configurations for different SAS standards, then compatibility is improved, but the control mechanism becomes more complex
Solution Approach 1:
The switch control unit serves multiple functions: it detects the SAS standard, identifies the appropriate power supply configuration, and controls the switches accordingly. This multi-functional design consolidates what would otherwise require separate control mechanisms for each SAS standard into a single universal control unit, managing complexity while maintaining broad compatibility.
Data Source
AI summary
According to one embodiment, a storage device includes a memory, a controller, an interface unit, a switch, and a switch control unit. The memory stores data. The controller is configured to control writing of data to the memory and reading of data from the memory. The interface unit includes a first terminal, a second terminal, and a third terminal. The first terminal has an electrical status different between a case where the storage device and a first device are connected, and a case where the storage device and a second device are connected. Through the second terminal, voltage is applied by the first device to the storage device in the case where the storage device and the first device are connected, and a control signal is input from the second device to the storage device in the case where the storage device and the second device are connected. Through the third terminal, power is supplied to the storage device. The switch switches a connection status and a disconnection status. In the connection status, the third terminal and the controller are electrically connected. In the disconnection status, the third terminal and the controller are electrically disconnected. The switch control unit is configured to control the switch to switch the connection status and the disconnection status based on electrical statuses of the first terminal and the second terminal.