Seagate ST800FM0032 ユーザーズマニュアル

P

ULSAR

.2 SAS P

RODUCT 

M

ANUAL

, R

EV

. C

  58

  

The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS standard.
Table 27 defines the general interface characteristics

Seagate SAS-2 drives are entirely compatible with the latest SAS-2 Specification (T10/1760-D) Revision 16.

The most important characteristic of the SAS-2 drive at 6Gb/s is that the receiver is capable of adapting the equalizer to optimize the 
receive margins. The SAS-2 drive has two types of equalizers:
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 your 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.

Bit rate (nominal)

Mbaud

1,500

3,000

6,000

Unit interval (UI)(nominal)

ps

666.6

333.3

166.6

Impedance (nominal, differential )

ohm

100

100

100

Transmitter transients, maximum

V

± 1.2

± 1.2

± 1.2

Receiver transients, maximum

V

± 1.2

± 1.2

± 1.2