SATA Power State Transition Logic for Deep Sleep Entry
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Solution Overview
Problem
Current power management mechanisms in storage systems, such as Serial ATA (SATA), are limited in achieving additional power savings due to the lack of direct transitions from the Partial to the Slumber power state, resulting in inefficient power usage when transitioning through the Active state and potential rejection of deeper power state entries.
Innovation Solution
Enabling direct transitions from the Partial state to the Slumber state without intermediate communication, allowing both host and device to independently manage power state changes, with capabilities and settings to control the timing of these transitions and ensure compatibility with the other device's latency tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If direct transitions from Partial state to Slumber state are enabled, then power savings are improved, but device complexity increases due to independent state management
Solution Approach 1:
The patent implements dynamic power state management where host and device can independently transition between power states (Active, Partial, Slumber) based on real-time operational conditions. The system dynamically adjusts state transitions without requiring intermediate communication, allowing each component to optimize its own power consumption while maintaining overall system functionality.
Solution Approach 2:
The invention enables self-service power state transitions where the host and device autonomously manage their own power states without requiring coordinated handshakes or intermediate communication. Each component independently evaluates when to transition to deeper power states, eliminating the need for complex coordination protocols while achieving significant power savings.
2Productivity
If independent power state transitions are implemented, then power management efficiency is improved, but reliability may worsen due to potential latency mismatches
Solution Approach 1:
The patent incorporates preliminary capability negotiation during system initialization, where host and device exchange information about their power state transition capabilities and latency tolerances. This preliminary setup enables independent transitions while maintaining reliability, as each component knows in advance what transitions the other can support without requiring real-time coordination.
Solution Approach 2:
The system changes the parameter of transition independence from coordinated sequential transitions to independent concurrent transitions. By modifying the transition mechanism to allow simultaneous state changes without intermediate communication, the patent improves power management efficiency while using capability negotiation to maintain reliability through parameter configuration rather than procedural coordination.
Data Source
AI summary
A host device and a storage device with a Serial ATA (SATA) architecture to independently transition to a deeper low power state after first entering an initial low power state without first transitioning to the Active state. The transition from the Partial state to the Slumber state is direct and the transition may be enabled, but not negotiated through a handshaking process.