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1-6
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Midrange internal SAS configuration: This is like the internal
SATA II configuration, but with high-end disks. This is more suitable
for low-range to midrange servers.
Figure 1.1
shows a direct-connect configuration. The Inter-IC (I
interface communicates with peripherals. The external memory bus
provides a 32-bit memory bus, parity checking, and chip select signals
for pipelined synchronous burst static random access memory
(PSBRAM), nonvolatile static random access memory (NVSRAM), and
Flash ROM.
Figure 1.1
Example of a SAS Direct-Connect Application
SAS/SATA II Device
SAS/SATA II Device
SAS/SATA II Device
SAS/SATA II Device
Figure 1.2
shows an example of the ServeRAID-MR10is controller
configured with an LSISASx12 expander that is connected to SAS disks,
SATA II disks, or both.
Overview
32-Bit Memory
Address/Data
SAS
PCI Express
RAID Controller
PCI Express Interface
2
Flash ROM/
Bus
PSBRAM/
NVSRAM
2
I
C
Interface
2
I
C
C)
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