Intel RS25NB008 User Guide - Page 24
Major Components, LSI* SAS2208 ROC, Flash ROM, Boot Strap ROM (SEEPROM), NVSRAM, SDRAM (Cache)
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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* SAS2208 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 RS25NB008 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 14 Intel® RAID Controller RS25NB008 Hardware User's Guide