Seagate ST6000NM0054 ユーザーズマニュアル

Seagate Enterprise Capacity 3.5 HDD v4 SAS Product Manual, Rev. D

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The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS standard.

Seagate SAS-3 compatible drives are compliant with the latest SAS-3 Specification (T10/BSR INCITS 519 rev. 06).

The main difference from SAS-2 is the Tx and Rx training that allows the host and drive to adjust the amplitude and emphasis values to the 
channel. The receiver still employs Decision Feedback Equalizer (DFE) and Feed Forward Equalizer (FFE) circuitry to accomplish this 
training.
1. A Decision Feedback Equalizer (DFE) which utilizes the standard SAS-2 training pattern transmitted during the SNW-3 training gap. 

The DFE circuit can derive an optimal equalization characteristic to compensate for many of the receive losses in the system.

2. A Feed Forward Equalizer (FFE) optimized to provide balanced receive margins over a range of channels bounded by the best and 

worst case channels as defined by the relevant ANSI standard.

Please contact the Seagate representative for SAS electrical details, if required.

For more information about the Phy, Link, Transport, and Applications layers of the SAS interface, refer to the Seagate SAS Interface 
Manual, part number 100293071.

For more information about the SCSI commands used by Seagate SAS drives, refer to the Seagate SCSI Commands Reference Manual, 
part number 100293068.

LED off, high

0 V 



 VOH 



 3.6 V

-100 μA < I

OH

 < 100 μA

LED o

n, low

I

OL

 = 15 mA

0 



 V

OL

 



 0.225 V

Bit rate (nominal)

Mbaud

1,500

3,000

6,000

12000

Unit interval (UI)(nominal)

ps

666.6

333.3

166.6

83.3

Impedance (nominal, differential )

ohm

100

100

100

100

Transmitter transients, maximum

V

± 1.2

± 1.2

± 1.2

± 1.2

Receiver transients, maximum

V

± 1.2

± 1.2

± 1.2

± 1.2