Seagate NAS HDD Product Manual, Rev. C
21
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
NAS HDD 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
.
4.2
SATA device plug connector pin definitions
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 (V
x
) must be terminated.
Table 5
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
V
33
3.3V power
P3
V
33
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
V
5
5V power
P9
V
5
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
V
12
12V power
P15
V
12
12V power
