Seagate BarraCuda Product Manual, Rev. E (Draft 2) 19
4. Serial ATA (SATA) Interface
These drives use the industry-standard Serial ATA interface that supports FIS data transfers. It supports ATA programmed input/output (PIO) modes
0–4; multiword DMA modes 0–2, and Ultra DMA modes 0–6. The drive also supports the use of the IORDY signal to provide reliable high-speed data
transfers.
For detailed information about the Serial ATA interface, refer to the Serial ATA: High Speed Serialized AT Attachment specification.
4.1 Hot-Plug Compatibility
BarraCuda drives incorporate connectors which enable users to hot plug these drives in accordance with the Serial ATA: High Speed Serialized AT
Attachment specification revision 2.0. This specification can be downloaded from www.serialata.or
g. This device requires a COMRESET from the
host after a hotplug event.
4.2 Serial ATA Device Plug Connector Pin Definitions
Table 9 summarizes the signals on the Serial ATA interface and power connectors. Refer to the Table Notes below.
Table 9 Serial ATA Connector Pin Definitions
Segment Pin Function Definition
Signal
S1 Ground 2nd mate
S2 A+
Differential signal pair A from Phy
S3 A-
S4 Ground 2nd mate
S5 B-
Differential signal pair B from Phy
S6 B+
S7 Ground 2nd mate
Key and spacing separate signal and power segments
Power
P1 V33 3.3V power
P2 V33 3.3V power
P3 V33 3.3V power, pre-charge, 2nd mate
P4 Ground 1st mate
P5 Ground 2nd mate
P6 Ground 2nd mate
P7 V5 5V power, pre-charge, 2nd mate
P8 V5 5V power
P9 V5 5V power
P10 Ground 2nd mate
P11 Ground or LED signal If grounded, drive does not use deferred spin
P12 Ground 1st mate
P13 V12 12V power, pre-charge, 2nd mate
P14 V12 12V power
P15 V12 12V power
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