Avago Technologies SAS 9200-8e Host Bus Adapter - Manual (Page 6)

LSI Corporation
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PCI Express to 6Gb/s Serial Attached SCSI (SAS) Host Bus Adapters User Guide
May 2013 Introduction
PCI Express Host Interface Features
 Provides compatibility with SATA target devices.
 Supports narrow ports and wide ports, as described in the following table.
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.
 Link widths of x16, x8, x4, and x1.
 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.
 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.
 Power management.
— Supports PCI Power Management 1.2
— Supports active-state power management (ASPM), including the L0, L0s, and L1 states, by placing links in a
power-saving mode when there is no link activity
 A replay buffer that preserves a copy of the data for retransmission in case a cyclic redundancy check (CRC)
error occurs.
 PCIe advanced error-reporting capabilities.
 Packetized and layered architecture.
 High bandwidth per pin with low overhead and low latency.
Table 2 6Gb/s SAS Bandwidths
Half Duplex Full Duplex
Narrow port (one lane), 600 MB/s Narrow port (one lane), 1200 MB/s
Wide port (two lanes), 1200 MB/s Wide port (two lanes), 2400 MB/s
Wide port (four lanes), 2400 MB/s Wide port (four lanes), 4800 MB/s
Table 3 PCIe Aggregate Bandwidth
Lanes
PCIe 2.0 Operation PCIe 3.0 Operation
Single Direction Dual Direction Single Direction Dual Direction
Single-lane (x1) 5 Gb/s 10 Gb/s 8 Gb/s 16 Gb/s
Quad-lane (x4) 20 Gb/s 40 Gb/s 32 Gb/s 64 Gb/s
Eight-lane (x8) 40 Gb/s 80 Gb/s 64 Gb/s 128 Gb/s
Sixteen-lane (x16) 80 Gb/s 160 Gb/s 128 Gb/s 256 Gb/s