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OCPRF100 MP Server System Technical Product Specification
Revision 1.0
92
Figure 8-2: Functional Block Diagram
8.2.1 Hot-swap Connectors
The backplane provides two hot-swap SCA-2 right angle connectors, which provide power and
SCSI signals using a single connector. Each SCSI drive attaches to the backplane using one of
these connectors.
8.2.2 SCSI Interface
There is one LVDS SCSI channel on the backplane. The SCSI interface on the backplane pro-
vides the required additional circuitry between the SCSI bus and the microcontroller (containing
the intelligence for the backplane), which allows the microcontroller to respond as a SCSI target.
This is implemented using a Symbios Logic* 53C80S SCSI interface chip (or equivalent).
8.2.3 LVD/SE Active Termination
The LVD/SE active terminators provide SCSI-3 compliant termination for the backplane end of
the SCSI bus. It is assumed that the other end of the SCSI segment is properly terminated as
required by the SCSI-3 specification.
8.2.4 Power Control
Power control on the backplane supports the following features.
Public
I2C BUS
Drive Fault
Indication
Support
CPU Unit
Private I2C
Temperature
Sensor
Serial
EEPROM
Power
Control
SCSI Interface
with LVD/SE
switch
LVD/SE Active
Terminators
LVDS SCSI Connector to Host
Controller
SCA2 Connectors
Narrow SCSI Connector
Floppy
Connector
IDE
Connector