12.4.6SAS transmitters and receivers

A typical SAS differential copper transmitter and receiver pair is shown in Figure 13. The receiver is AC coupling to eliminate ground shift noise.

 

TX

Transmitter

Differential

Transfer Medium

100

 

 

TY

Figure 13. SAS transmitters and receivers

.01

.01

RX

Receiver

100

RY

12.4.7Power

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.

12.5Signal characteristics

This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 11 for signal type and signal name information.

12.5.1Ready LED Out

The Ready LED Out signal is driven by the drive as indicated in Table 12.

Table 12: Ready LED Out conditions

Normal command activity

 

LED status

 

 

 

Ready LED Meaning bit mode page 19h

0

 

1

 

 

 

 

Spun down and no activity

Off

 

Off

 

 

 

 

Spun down and activity (command executing)

On

 

On

 

 

 

 

Spun up and no activity

On

 

Off

 

 

 

 

Spun up and activity (command executing)

Off

 

On

 

 

 

 

Spinning up or down

 

Blinks steadily

 

(50% on and 50% off, 0.5 seconds on and off for 0.5 seconds)

 

 

 

Format in progress, each cylinder change

 

Toggles on/off

 

 

 

 

Constellation ES.2 SAS Product Manual, Rev. D

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Seagate ST33000650SS, ST33000652SS manual Signal characteristics, SAS transmitters and receivers, Power, Ready LED Out

ST33000652SS, ST33000650SS, ST33000651SS specifications

The Seagate ST33000651SS, ST33000650SS, and ST33000652SS are high-performance enterprise hard drives designed for demanding storage applications. These models are part of the Seagate Constellation ES series, known for their reliability and performance in server and data center environments.

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