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1-4 Overview
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The RAID controller supports the SAS protocol as described in the
Serial
Attached SCSI Standard
,
version 1.1
. The controller also supports the
Serial ATA II (SATA II) protocol defined by the
Serial ATA specification,
version 1.0a
. SATA II is an extension to SATA 1.0a. In addition, the RAID
controller supports the following SATA II features:
• 3 Gbit/s SATA II
• Staggered spin-up
• Hot Plug
• Activity and fault indicators for each PHY
• Port Selector (for dual-port drives)
Each port on the RAID controller supports SAS or SATA II devices using
the SSP, SMP, STP, and SATA II. The SSP enables communication with
other SAS devices. SATA II enables the RAID controller to communicate
with SATA II devices.
1.4 Configuration Scenario
The following is the main scenario in which you can use the MegaRAID
8480 RAID Controller:
• High-end external SAS or SATA II configurations: Disks can be either
SATA II or SAS. External enclosure management through in-band,
SCSI-enclosed storage. STP and SMP need to be supported.
Figure 1.1 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 synchronous burst static random access memory
(PSBRAM), nonvolatile static random access memory (NVSRAM), and
Flash ROM.