LSI MegaRAID SCSI 320-0 Zero-Channel RAID Controller Series 520 Hardware Manual page 72

6.2.3.1 J2 Dirty Cache LED
6.2.3.2 J3 Clear EPROM
6.2.3.3 J4 BIOS Enable
6-4
Figure 6.1 MegaRAID SCSI 320-0 Controller Layout
J2 is a two-pin header for the dirty cache LED. This can be connected
to an LED on the computer enclosure. The LED will be lit when data in
the cache has not yet been written to the storage device.
J3 is a two-pin header that clears the erasable progammable read-only
memory (EPROM) configuration data.
J4 is a 2-pin header that enables or disables the MegaRAID onboard
BIOS. The onboard BIOS should be enabled (J4 unjumpered) for normal
board position. Table 6.3
Table 6.3 Pinout for J4 BIOS Enable
J4 Setting Onboard BIOS Status
Unjumpered Enabled
Jumpered Disabled
Hardware Installation
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
J2 J3 J4
contains the pinout for J4.
Optional Backup
Battery Unit
J8
Connector