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6-00020-02
The SCSI protocol also defines a priority-based arbitration method, based on
the target ID of the device attaching to the bus. The SCSI ID priority order is,
from highest to lowest, 7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8.
Table of SCSI Terminology and Limitations
The following table (look for updates at http://www.scsita.org/) defines the
number of devices supported, based on the negotiated transfer type. When
reviewing the limitations of a bus, the capabilities of the fastest devices must be
considered. The bus length indicates total SCSI bus length, including any
internal device cables, rather than the length between any two devices.
Table 5: SCSI Trade Association Terminology
Endorsed Terminology
for SCSI Parallel
Interface Technology
Max. Bus Speed,
MB/Sec
Bus
Width,
Bits
Max.
Bus
Lengths
,
in
Meters
(1)
Max.
Devices
LVD
SCSI 1 (2) 5 8 25 8
Fast SCSI (2) 10 8 25 8
Fast Wide SCSI (2) 20 16 25 16
Ultra SCSI (2) 20 8 25 8
Ultra SCSI (2) 20 8 - 4
Wide Ultra SCSI 40 16 25 16
Wide Ultra SCSI 40 16 - 8
Wide Ultra SCSI 40 16 - 4
Ultra2 SCSI (2,3) 40 8 25 8
Wide Ultra2 SCSI (3) 80 16 25 16
Ultra3 SCSI or Ultra 160 (5) 160 16 (4) 16
Ultra320 320 16 (4) 16