Ultra-Wide Scsi Interface (Sym53C876) - Sun Microsystems SPARCengine Ultra AXi Technical Manual

2.1.4

Ultra-Wide SCSI Interface (SYM53C876)

Interface connector
No. of devices
Modes of operation
Electrical interface
Cable length
Cable termination
SCSI ID selection (Solaris default settings, internal SCSI bus)
Boot Support
SCSI Devices Supported
2-4 SPARCengine Ultra AX i OEM Technical Manual • May 1999
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
Up to 8 devices on internal SCSI interface
Up to 8 devices on external SCSI interface
(The SCSI controller is considered one device)
Both narrow 8-bit and wide 16-bit in DMA modes are
supported
Single ended, fast-20, 16-bit wide bus
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)
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
OnBoard controller: 7
CD-ROM: 6
Hard Disk 1: 0
Hard Disk 2: 1
Solaris CD-ROM: Single user, install operations
Solaris installed hard disk: single user, multi user, all
operations
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