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Designing Energy Efficient SATA Devices: 2011-2013 Platforms

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Designing Energy Efficient SATA Devices: 2011-2013 Platforms

Designing Energy Efficient SATA Devices, Overview and Implementation Recommendations

2011 – 2013 Platforms, April 2011, Revision 1.63

This document contains a series of recommendations designed to assist platform vendors, software developers and SATA device vendors to build power-friendly SATA based platforms. Serial ATA (SATA) is the next generation of storage interface technology that has replaced Parallel ATA (PATA) in mobile systems. SATA provides many new features including: increased data transfer rates with increased protocol efficiency; low pin count interconnect with thinner flexible cables and connectors; decreased signaling voltage; enhanced error detection; and a point to-point topology with the elimination of master/slave. It also includes support for Native Command Queuing, Native Hot Plug, Staggered Spin Up, and Port Multipliers. These new features are designed to provide both immediate value to the SATA subsystem today, and allow for future growth in storage technology over the next several years. SATA Link Power Management can be used to reduce the power consumption of the SATA interface, providing SATA capabilities at a minimum power cost.

SATA Link Power Management (LPM) puts the physical layer (PHY) of the link into a low-power state. This PHY layer Link Power Management is independent of the ATA protocol power state of the disk, and as such complements the existing power management capabilities provided by the ATA command set. For example, the ATA command set reduces the power consumption of the attached device by issuing ATA protocol-level power state change requests to the disk. These requests typically instruct the device to spin down the media to save power. The rotational state of the media is completely independent of the state of the link.

Independent intelligent PHY power management has shown a significant reduction in the overall power consumption of the SATA subsystem, both in the platform and in the SATA device itself.

Read the full Designing Energy Efficient SATA Devices Overview.