Lenovo ThinkServer RD330 Software User's Manual page 17

MegaRAID SAS Software User Guide
Figure 1 shows a direct-connect configuration. The Inter-IC (I
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.
NOTE: The external memory bus is 32-bit for the SAS 8704ELP and the SAS 8708ELP,
and 64-bit for the SAS 8708EM2, the SAS 8880EM2, and the SAS 8888ELP.
SAS/SATA II Device
SAS/SATA II Device
SAS/SATA II Device
SAS/SATA II Device
Figure 1: Example of a SAS Direct-Connect Application
Figure 2 shows an example of a SAS RAID controller configured with a SASx12
expander that is connected to SAS disks, SATA II disks, or both.
SASx12
Expander
SAS/SATA II SAS/SATA II
Drives
Figure 2: Example of a SAS RAID Controller Configured with a SASx12
Expander
32-Bit Memory
Address/Data
SAS
PCI Express
RAID Controller
Interface
PCI Express Interface
PCI Express Interface
8
SAS RAID Controller
SAS1078
PCI Express to SAS ROC
SAS/SATA
Drives
Drives
|
Chapter 1: Overview Configuration Scenarios
2
C) interface
Flash ROM/
Bus
PSBRAM/
NVSRAM
2
I C
2
I C
Peripheral
Bus
Flash ROM/
NVSRAM/
2
I C/UART
72-bit DDR/DDR2
with ECC
Interface
SRAM
SDRAM SRAM SRAM
SASx12
Expander
SAS/SATA II
SAS/SATA II
Drives
Drives
Page 17