16 Intel® RAID Controller RS25DB080 Hardware User’s Guide
Major Components
LSI* SAS2208 ROC
The LSI* SAS2208 dual-core RAID-On-Chip (ROC) is an integrated SAS and I/O
controller operating at 800 MHz. For more information, see http://www.lsi.com/. The
LSI* SAS2208 dual-core 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 DDR3 SDRAM interface with ECC checking
• Fusion MPT message unit
• PCI Express* interface supports x8, x4, and x1 lane configurations
Flash ROM
An 16-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 128-KB NVSRAM is used to store disk and drive setup information.
SDRAM (Cache)
The Intel
®
RAID Controller RS25DB080 has a 1GB memory board connected to it at
factory, which integrated DDR3 667 MHz ECC SDRAM memory. This DIMM is
connected directly to the memory controller interface bus of the ROC and serves as
storage for the executable code transferred from the flash. It also serves as cache during
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