Avago Technologies MegaRAID SAS 8204ELP - Manual (Page 52)

3-8 MegaRAID SAS RAID Controller Characteristics
Copyright © 2007 by LSI Corporation. All rights reserved.
Table 3.3 SAS 8880EM2 RAID Controller – Jumpers and
Connectors
Jumper Type Description
J1 Battery Backup
Connector 20-pin connector
Provides the interface to the battery
backup unit. The SAS 8880EM2 RAID
controller connects directly to the
LSIiBBU07.
J2 Universal Asynchronous
Receiver/Transmitter
debugging 4-pin connector
Reserved for LSI use.
Note: This connector uses 3.3V LVTTL
levels and will be damaged if connected
to standard transceiver levels.
J5 BIOS Disable 2-pin connector
Reserved for LSI use.
J6 Board Default Debug 2-pin connector
Reserved for LSI use (default jumper).
J7 Cache Write Pending
LED 2-pin connector
The connector for the enclosure LED. It
provides a signal that indicates when the
on-board cache contains data and a
write from the cache to the hard drives is
pending. Optional.
J13 Global Drive Activity
header 2-pin connector
Indicates activity on the physical drives.
Operates at approximately 10mA at 3.3V.
J20 x4 SAS PORT B (Lanes
0-3) The x4 SAS connectors connect the
cables from the RAID controller to SAS
or SATA II physical drives or to a SAS
expander.
J21 x4 SAS PORT A (Lanes
4-7) The x4 SAS connectors connect the
cables from the RAID controller to SAS
or SATA II physical drives or to a SAS
expander.
J23 Debug connector Reserved for LSI use.