Intel
©
LB440GX 2U Rack Server Chassis TPS Rev 1.0
12
7.4 Functional Description
This section defines the architecture of the Intel
LB440GX Hot-swap SCSI Backplane, including
descriptions of functional blocks and how they operate. The following figure shows the functional
blocks of the Hot-swap SCSI Backplane. An overview of each block follows.
SCA-2 Connector 1
(Lower Slot)
68P SCSI
Connector
Terminator
Enable Jumper(JP2)
Short : Enable
Open : Disable
SCA-2 Connector 0
(Upper Slot)
LVD/SE Multimode
TERMINATOR
Drive Power
Control
ID Config
EPLD
ID SELECT SW
DIP2 DIP1 SLOT0 SLOT1
OFF OFF 1 0
OFF ON 3 2
ON OFF 5 4
ON ON 9 8
Presence
Presence
Figure 7.
Hot Swap SCSI Backplane Block Diagram
7.4.1 68 pin LVD high density Hot-Swap Connectors
The Intel
LB440GX contains two hot swap backplane boards with two high-density LVD connectors
on each backplane. The connectors provide power and SCSI signals using a single connector. Each
SCSI drive attaches to the backplane using one of these connectors.
7.4.2 SCSI Interface
The SCSI interface on the Intel
LB440GX Hot-swap SCSI Backplane provides the required circuitry
between the SCSI bus and the Adaptec controller, which contains the intelligence for the backplane.
The interface consists of an Altera EPLD. After powering on, the Altera EPLD detects the presence of
disks in the slots and powers them on. The SCSI ID configuration of the disks is configured on the
backplanes by using two DIP-switches located on the boards. See section 7.3.1 for the SCSI ID
configuration options.
