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Intel® RAID Expander Card RES2SV240 Hardware User’s Guide 13
Major Components
LSI* LSISAS2x24 24-Port SAS/SATA Expander chip
The LSI* LSISAS2x24 24-Port SAS/SATA Expander chip is a 24-port, 6.0Gb/s Serial
Attached SCSI (SAS) expander that enables the connection of up to 24 directly attached
SAS or Serial ATA (SATA) devices, and provides table routing to support connections for
up to 1024 SAS addresses. Each expander phy is individually configurable and performs
SAS and SATA transfers based on the speed of the host or target at either 6.0Gb/s,
3.0Gb/s, or 1.5Gb/s. For more information, see http://www.lsi.com/. The LSI*
LSISAS2x24 24-Port SAS/SATA Expander chip provides the following functionality:
• Provides 24 phys
• Semi-Symmetric architecture
— Any phys may be combined into wide port(s)
— Any phy can be SAS or SATA attached
• Supports multiple data rates and auto-negotiation between the following:
— 1.5Gb/s, 3.0Gb/s, and 6.0Gb/s SAS
— 1.5Gb/s, 3.0Gb/s, and 6.0Gb/s SATA
• Supports SSP, STP, and SMP
• Supports the SAS protocol described in the Serial Attached SCSI (SAS) Standard,
version 2.0
• Supports SATA as defined in the Serial ATA: High Speed Serialized AT Attachment
Specification, version 2.5
• Supports SATA II including these features:
• 6.0Gb/s SATA
• Staggered spin-up
• Hot Plug
• Native Command Queuing
• Activity and fault indicators per phy
• Port Selector (for dual-port drives)
• Provides a low-latency connection router to efficiently create and maintain
connections
• Supports T10-Based and Phy-Based Zoning for storage partitioning
• PHY[3:0] supports optical links between LSI Gen2 SAS device
• Allows any number of phys to be included in a wide port
• Provides four I2C interfaces: I2C-A, I2C-B, I2C-C, and an I2C interface to an
external SEP: