2-4 SPARCengine Ultra AX
i
OEM Technical Manual • May 1999
2.1.4 Ultra-Wide SCSI Interface (SYM53C876)
Interface connector 68-pin UW connector rear panel for external devices
68-pin UW connector J1001 for internal devices
See A.3.7 on page A-19 and A.3.8 on page A-20 for
pinouts and part numbers
No. of devices Up to 8 devices on internal SCSI interface
Up to 8 devices on external SCSI interface
(The SCSI controller is considered one device)
Modes of operation Both narrow 8-bit and wide 16-bit in DMA modes are
supported
Electrical interface Single ended, fast-20, 16-bit wide bus
Cable length Max. 3 Meters for 2 devices (2 connectors)
Max. 3 Meters for 3 devices (3 connectors)
Max. 3 Meters for 4 devices (4 connectors)
Max. 3 Meters for 5 devices (5 connectors)
Max. 1.5 Meters for 6 devices (6 connectors)
Max. 1.5 Meters for 7 devices (7 connectors)
Max. 1.5 Meters for 8 devices (8 connectors)
Cable termination Required for both ends of internal and external cables
OnBoard termination always active for internal
OnBoard termination always active for external
Last device on cable end needs to be terminated
SCSI ID selection (Solaris default settings, internal SCSI bus)
OnBoard controller: 7
CD-ROM: 6
Hard Disk 1: 0
Hard Disk 2: 1
Boot Support Solaris CD-ROM: Single user, install operations
Solaris installed hard disk: single user, multi user, all
operations
SCSI Devices Supported CD-ROM drive with (512Bytes block size for bootable)
Hard disk drives
Tape drive units
Other devices need suitable Solaris device drivers
Additional SCSI information can be found at the
following URL: http://scitexdv.com:8080/SCSI2/
Frames/SCSI2.html
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