Seagate BarraCuda Product Manual, Rev. A

28

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SATA Interface

5.0

SATA Interface

These drives use the industry-standard Serial ATA (SATA) interface that supports FIS data transfers. It supports ATA

programmed input/output (PIO) modes 0 to 4; multiword DMA modes 0 to 2, and Ultra DMA modes 0 to 6.

For detailed information about the SATA interface, refer to the “Serial ATA: High Speed Serialized AT Attachment”

specification.

5.1

Hot-Plug compatibility

BarraCuda drives incorporate connectors which enable users to hot plug these drives in accordance with the SATA

Revision 3.2 specification. This specification can be downloaded from www.serialata.org.

5.2

SATA device plug connector pin definitions

Table 7

summarizes the signals on the SATA interface and power connectors.

Notes

1.

All pins are in a single row, with a 1.27 mm (0.050 in) pitch.

2.

The comments on the mating sequence apply to the case of backplane blindmate connector only. In this case, the

mating sequences are:

• the ground pins P4 and P12.

• the pre-charge power pins and the other ground pins.

• the signal pins and the rest of the power pins.

3.

There are three power pins for each voltage. One pin from each voltage is used for pre-charge when installed in a

blind-mate backplane configuration.

• All used voltage pins (Vx) must be terminated.

Table 7

SATA 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