Adaptec SAS RAID Controllers Guide d'installation télécharger pdf (Page 75)

Appendix B HBA Specifications 61

■ Physical layer: Consists of two sets of differential lines, one receive set and one

transmit set [4-wire total]. This layer defines the cable, connector, and transceiver

[Transmitter / Receiver] characteristics.

■ PHY layer: Connects the differential Transmitter and Receiver circuits [ICs] to the

Physical Layer.

■ Link layer

■ Port layer

■ Application layer

The external connector accepts 4 physical links and the cable may hold between 1

and 4 physical links. Internal connectors are defined and two data rates are defined:

1.5 Gbps and 3.0 Gbps over a 100 ohm [+ 15 ohm] differential impedance cable.

SAS uses the Serial ATA physical interface, including the connector receptacle and

connector plugs. SAS transmits data using 8B/10B at a maximum level of 1.2 volts

[Tx voltage = 800-1600mV], [Rx voltage = 275-1600mV]. SAS uses big-endian, while

SATA uses little-endian byte ordering. SAS uses a 32 bit CRC. SAS uses LVDS.

Connector Pin Definitions

SAS Pin-Out

Two types of ports are defined: A Narrow Port communicates over a narrow link and

contains only one transmit/receive pair, and a Wide Port communicates over a wide

link and contains more than one transmit/receive pair. The ports reside in the PHY

layer, and the link resides in the physical layer.

TABLE B-2 SAS Pin-Out

Signal Name 1 Physical Link 2 Physical Links 3 Physical Links 4 Physical Links

Rx 0+ S1 S1 S1 S1

Rx 0- S2 S2 S2 S2

Rx 1+ N/A S3 S3 S3

Rx 1- N/A S4 S4 S4

Rx 2+ N/A N/A S5 S5

Rx 2- N/A N/A S6 S6

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 147 148

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Adaptec SAS RAID Controllers Guide d'installation Page 75