User`s guide

14 Intel® RAID Controller RS2SG244 Hardware User’s Guide
Major Components
LSI* SAS2108 ROC
The LSI* SAS2108 RAID-On-Chip (ROC) is an integrated SAS and I/O controller with
an embedded Power PC* 440 core running at 800 MHz. For more information, see
http://www.lsi.com/. The LSI* SAS2108 ROC provides the following functions:
• x8 PCI Express* bus operating at 6.0 Gbps serial transfer rate
• Spread Spectrum Clocking (SSC)
• SAS/SMP/STP/SATA support
• Supports SAS and SATA devices
• Initiator and Target mode (SSP)
• Wide port support
• T10 End-to-End Data Protection (EEDP)
• Local 72-bit DDR2 SDRAM interface with ECC checking
• Fusion MPT message unit
• PCI Express* interface supports x8, x4, and x1 lane configurations
LSI SAS2 x36 Expander
The LSISAS2 x36 expander is a 36-port, 6.0Gb/s Serial Attached SCSI (SAS) expander
that enables the connection of up to 36 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.
Flash ROM
An 8-MB CFI-compliant flash ROM is used to accommodate RAID firmware and RAID
BIOS Console 2 OpROM.
Boot Strap ROM (SEEPROM)
The serial bootstrap ROM is used to configure the LSI* SAS2108 ROC before the server
board configures the PCI Express* registers. The bootstrap ROM sets the Phase Lock
Loop (PLL) dividers, bootstrap configuration, and so on.
NVSRAM
A 32-KB NVSRAM is used to store disk and drive setup information.