Intel
®
Carrier Grade Server TIGPT1U TPS
Midplane Board
Revision 1.0
53
7.3 Functional
Description
The SCSI subsystem on the midplane board is designed to give the end user support for two
SCSI hot-plug hard drives. The design enables easy use and replacement of the SCSI hard
drives without powering down the system. The following block diagram and functional
description will explain how the midplane SCSI subsystem works.
7.3.1
Midplane System Board SCSI Subsystem Block Diagram
The block diagram in Figure 7-1 illustrates the general architecture of the midplane board SCSI
subsystem. The physical and functional blocks of the SCSI subsystem are shown, with arrows
representing buses and signals, and the blocks representing the functional parts of the SCSI
subsystem.
Mid Plane Power/Signal Connector
68 Pin SCSI
connector
(from
Baseboard)
12 V
5 V
12 V
5 V
SC
SI St
at
us
S
ignal
s
S
C
SI
St
atu
s S
ig
n
als
Int
e
rnal
LVD S
C
SI
U320
SCA-2
Connector
Drive 2
SCA-2
Connector
Drive 1
SCSI Drive 2
LVD Active
Terminator
SCSI Drive 1
Figure 7-1. Midplane System Board SCSI Subsystem Block Diagram