Nvram And Flash Rom; Scsi Connectors; Single-Ended And Differential Scsi Buses; Maximum Cable Length For Scsi Standards - LSI MegaRAID SCSI 320-2 RAID Controller Series 518 Hardware Manual

1.2

NVRAM and Flash ROM

1.3

SCSI Connectors

1.4

Single-Ended and Differential SCSI Buses

1.5

Maximum Cable Length for SCSI Standards

1-2
A 32 KB x 8 NVRAM stores RAID system configuration information. The
MegaRAID SCSI 320-2 firmware is stored in flash ROM for easy
upgrade.
The MegaRAID SCSI 320-2 has two ultra high-density 68-pin external
SCSI connectors and two 68-pin internal SCSI connectors for internal
SCSI drives.
The SCSI standard defines two electrical buses:
Single-ended bus
Low-voltage differential bus
Table 1.1 lists the maximum SCSI cable length and number of disk drives
that you can use, depending on the SCSI speeds and type of device.
Table 1.1 Maximum Cable Length for SCSI Standards
Standard
Ultra SCSI
Ultra SCSI
Wide Ultra SCSI
Wide Ultra SCSI
Wide Ultra SCSI
Overview
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
Single Ended Low-Voltage
SCSI Differential SCSI
1.5 m
3 m
1.5 m
3 m
Maximum # of
Drives
12 m 7
12 m 3
12 m 15
12 m 7
12 m 3