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LSI Corporation
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12Gb/s MegaRAID SAS Software User Guide

March 2014
Chapter 1: Overview
Configuration Scenarios
These configurations are for both internal connectivity and external connectivity, using SATA II drives, SAS drives,
or both. External enclosure management is supported through in-band, SCSI-enclosed storage. The configuration
must support STP and SMP.
The following figure shows a direct-connect configuration. The Inter-IC (I
2
C) interface communicates with peripherals.
The external memory bus provides a 32-bit memory bus, parity checking, and chip select signals for pipelined burst
static random access memory (PBSRAM), 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.
Figure 1 Example of an LSI SAS Direct-Connect Application
The following figure shows an example of a SAS RAID controller configured with an LSISASx12 expander that is
connected to SAS disks, SATA II disks, or both.
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