Intel SPSH4 - Server Platform - 0 MB RAM, Technical Product Specification

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SPSH4 Server SystemTechnical Product Specification
Revision 1.11
Intel reference number 10736
53
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The LVD (Ultra2) length specification is 15 devices at 12 meters and 1-2 devices at 25
meters
•
The SE (Ultra) length specification is 5-8 devices at 1.5 meters (59 inches) and 1-4 devices
at 3 meter
•
If used in SE Ultra mode, the backplane uses 30 of the 59 inches of the SCSI Bus length
•
The backplane’s SCSI interface counts as one device on the SCSI Bus regardless the
presence of any SAF-TE compliant host controller.
6.3 Functional Description
This chapter defines the architecture of the LVD/SE SCSI Backplane, including descriptions of
functional blocks and how they operate.
Figure 20 shows the functional blocks of the LVD/SE SCSI Backplane. The two boards are split
such that the backplane has the SCSI connectors, drive fault/activity LEDs, and termination, and
the SAF-TE addin card has the rest of the blocks. An overview of each block follows.
Figure 20: Functional Block Diagram
6.3.1 Wide SCSI Connector
SCSI input from Host SCSI Controller (baseboard or RAID card) in a press-fit connector.
6.3.2 SCA-2 Connectors
The LVD/SE SCSI backplane provides five SCA-2 connectors. These provide power and SCSI
signals using a single connector. Each connector has control signals that enable the backplane
to provide SCSI ID assignments as well as drive motor spin-up configuration. Each SCSI drive
attaches to the backplane using one of these connectors.