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11.4.6
SAS transmitters and receivers
A typical SAS differential copper transmitter and receiver pair is shown in Figure 18. The receiver is AC coupling to eliminate ground shift
noise.
Figure 18.
SAS transmitters and receivers
11.4.7
Power
The drive receives power (+5 volts and +12 volts) through the SAS device connector.
Three +12 volt pins provide power to the drive, 2 short and 1 long. The current return for the +12 volt power supply is through the common
ground pins. The supply current and return current must be distributed as evenly as possible among the pins.
Three +5 volt pins provide power to the drive, 2 short and 1 long. The current return for the +5 volt power supply is through the common
ground pins. The supply current and return current must be distributed as evenly as possible among the pins.
Current to the drive through the long power pins may be limited by the system to reduce inrush current to the drive during hot plugging.
11.5
Signal characteristics
This section describes the electrical signal characteristics of the drives input and output signals. See Table 15 for signal type and signal
name information.
11.5.1
Ready LED Out
The Ready LED Out signal is driven by the drive as indicated in Table 16.
Table 16
Ready LED Out conditions
Normal command activity
Ready LED Meaning bit mode page 19h
Spun down and no activity
Spun down and activity (command executing)
Spun up and no activity
Spun up and activity (command executing)
Spinning up or down
Format in progress, each cylinder change
S
E
P
EAGATE
NTERPRISE
ERFORMANCE
LED status
(50% on and 50% off, 0.5 seconds on and off for 0.5 seconds)
15K HDD
5
T
SSHD
V
AND
URBO
0
Off
On
On
Off
Blinks steadily
Toggles on/off
2 P
M
, R
. B
V
RODUCT
ANUAL
EV
1
Off
On
Off
On
54
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