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AM1808
SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014
6.14 Serial ATA Controller (SATA)
The Serial ATA Controller (SATA) provides a single HBA port operating in AHCI mode and is used to
interface to data storage devices at both 1.5 Gbits/second and 3.0 Gbits/second line speeds. AHCI
describes a system memory structure that contains a generic area for control and status, and a table of
entries describing a command list where each command list entry contains information necessary to
program an SATA device, and a pointer to a descriptor table for transferring data between system memory
and the device.
The SATA Controller supports the following features:
•
Serial ATA 1.5 Gbps (Gen 1i) and 3 Gbps (Gen 2i) line speeds
•
Support for the AHCI controller spec 1.1
•
Integrated SERDES PHY
•
Integrated Rx and Tx data buffers
•
Supports all SATA power management features
•
Internal DMA engine per port
•
Hardware-assisted native command queuing (NCQ) for up to 32 entries
•
32-bit addressing
•
Supports port multiplier with command-based switching
•
Activity LED support
•
Mechanical presence switch
•
Cold presence detect
The SATA Controller support is dependent on the CPU voltage operating point:
•
At CVDD = 1.3V, SATA Gen 2i (3.0 Gbps) and SATA Gen 1i (1.5 Gbps) are supported.
•
At CVDD = 1.2V, SATA Gen 2i (3.0 Gbps) and SATA Gen 1i (1.5 Gbps) are supported.
•
At CVDD = 1.1V, SATA Gen 1i (1.5 Gbps) only is supported.
•
At CVDD = 1.0V, SATA is not supported.
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Peripheral Information and Electrical Specifications
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