Sas Features; Pci Express Host Interface Features - LSI PCI Express to 6Gb/s Serial Attached SCSI (SAS) User Manual

PCI Express to 6Gb/s Serial Attach SCSI (SAS) Host Bus Adapters User Guide
June 2012
1.2

SAS Features

This section lists the SAS features of the LSI 6Gb/s SAS HBAs:
Supports serial SCSI protocol (SSP), serial ATA tunneling protocol (STP), and serial management protocol (SMP), as

defined in the Serial Attached SCSI (SAS) Specification, version 2.0.
Supports SATA, as defined in the Serial ATA Specification, version 3.0.
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Provides configurable drive spin-up sequencing on a per-phy basis.
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Simplifies cabling with a point-to-point, serial architecture.
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Provides smaller and thinner cables that promote unrestricted airflow.
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Provides a serial, point-to-point, enterprise-level storage interface.
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Transfers data using SCSI information units.
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Provides compatibility with SATA target devices.
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Supports narrow ports and wide ports, as described in the following table.
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Table 2 6Gb/s SAS Bandwidths
Narrow port (one lane), 600 MB/s
Wide port (two lanes), 1200 MB/s
Wide port (four lanes), 2400 MB/s
1.3

PCI Express Host Interface Features

This section lists the PCIe host interface features of the LSI 6Gb/s HBAs:
A single-phy (one lane) link transfer rate up to 8Gb/s in each direction.
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Link widths of x16, x8, x4, and x1.
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Automatic downshift. The LSISAS9202-16e HBA automatically downshifts to a x8-link width if plugged into a x16

connector that is wired as a x8 connector. Other HBA models automatically downshift to a x4-link if plugged into
a x8 connector that is wired as a x4 connector.
A scalable interface.

Table 3 PCIe Aggregate Bandwidth
Lanes
Single-lane (x1)
Quad-lane (x4)
Eight-lane (x8)
Sixteen-lane (x16)
Serial, point-to-point interconnections between devices.

Reduces the electrical load of the connection
—
Enables higher transmission and reception frequencies
—
Lane reversal and polarity inversion.

PCIe hot plug.
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Half Duplex
PCIe 2.0 Operation
Single Direction Dual Direction
5 Gb/s
20 Gb/s
40 Gb/s
80 Gb/s
Full Duplex
Narrow port (one lane), 1200 MB/s
Wide port (two lanes), 2400 MB/s
Wide port (four lanes), 4800 MB/s
PCIe 3.0 Operation
Single Direction
10 Gb/s 8 Gb/s
40 Gb/s 32 Gb/s
80 Gb/s 64 Gb/s
160 Gb/s 128 Gb/s
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Dual Direction
16 Gb/s
64 Gb/s
128 Gb/s
256 Gb/s
Introduction
SAS Features