SATA Interface Power Management via Deep Slumber States
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Solution Overview
Problem
The SATA interface faces challenges in reducing power consumption due to skew and crosstalk issues in parallel transfer methods and high power usage in serial transfer modes, necessitating more efficient power management strategies.
Innovation Solution
Implementing a power management method that allows the SATA interface to request and enter various power saving states, including a deep slumber state, where only essential circuits receive power, and using an out-of-band signal detector and squelch circuit to detect wake-up signals, reducing overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the SATA interface uses parallel transfer manner, then data transfer capability is improved, but skew and crosstalk issues arise due to multiple signal lines
Solution Approach 1:
The parallel transfer interface is segmented into multiple independent serial channels, each handling a portion of the data transfer. This segmentation eliminates the skew and crosstalk issues inherent in parallel transfer while maintaining high data transfer capability through aggregated serial channels.
Solution Approach 2:
The patent transitions from parallel spatial dimension (multiple signal lines transferring simultaneously) to serial temporal dimension (single signal line transferring sequentially at higher frequency), effectively solving the skew and crosstalk problems by changing the fundamental dimension of data transfer.
2Speed
If the SATA interface operates in active mode, then data transmission speed is improved, but power consumption increases
Solution Approach 1:
The SATA interface implements dynamic power management by allowing the receiver to selectively adjust its power state based on actual data transfer requirements. The receiver can transition between active and low-power states dynamically, optimizing the balance between transmission speed and power consumption.
Solution Approach 2:
The patent changes the power consumption parameter of the receiver based on operational needs. By implementing multiple power states (active, partial, slumber, deep slumber) with different power consumption levels and wake-up times, the system can adapt power parameters to match actual data transfer requirements.
3Use of energy by moving object
If the SATA interface enters deep power saving state, then power consumption is reduced, but wake-up time increases
Solution Approach 1:
The transmitter performs preliminary actions by sending wake-up signals before actual data transfer begins. This allows the receiver to prepare for wake-up in advance, reducing the effective wake-up time from deep power saving state while maintaining low power consumption during idle periods.
Solution Approach 2:
The system implements periodic wake-up signal transmission during deep slumber state. Instead of requiring full system wake-up, periodic signals allow the receiver to maintain minimal operational state, balancing power savings with reduced wake-up latency.
Data Source
AI summary
At least one example embodiment discloses a method of managing a power between a host serial advanced technology attachment (SATA) interface and a device SATA interface. The method includes first requesting to enter one of power saving states, defined by a SATA protocol, and second requesting to enter a deep power saving state if one of the host SATA interface and the device SATA interface operates at the first requested power saving state. The first requesting to enter one of power saving states and the second requesting to enter a deep power saving state are performed by one of the host SATA interface and the device SATA interface.