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1-2 Overview
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
1.1 Features
MegaRAID SCSI 320-0 features include:
· Provides a high performance I/O migration path while preserving
existing PCI-SCSI software.
· Performs SCSI data transfers up to 320 Mbytes/s.
· Performs synchronous operation on a wide low-voltage differential
(LVD) SCSI bus.
· Allows up to 15 LVD SCSI devices on the wide bus.
· Includes an Intel GC80302 integrated I/O processor that performs
RAID calculations and routing.
· Supports 32 to 128 Mbytes of SDRAM on-board cache memory used
for read and write-back caching, and RAID 5 parity generation.
1.2 NVRAM and Flash ROM
A 32 Kbyte x 8 nonvolatile random access memory (NVRAM) stores
RAID system configuration information. The MegaRAID SCSI 320-0
firmware is stored in flash ROM for easy upgrade.
1.3 Single-Ended and Differential SCSI Buses
The SCSI standard defines two electrical buses:
· Single-ended bus
· Low-voltage differential bus