User Manual

Seagate BarraCuda Product Manual, Rev. H 21
www.seagate.com
4.0 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.
4.1 Hot-Plug compatibility
Seagate 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.or
g.
4.2 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 con-
figuration.
• All used voltage pins (V
x
) 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
V
33
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
V
5
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
V
12
12V power, pre-charge, 2nd mate
P14
V12
12V power
P15
V12
12V power