96122 • Revision: F 15
CHAPTER
3
SCSI Bus Operations
This chapter describes the seven elements that SCSI uses for controlling the
interface, transferring data, issuing commands, and returning status for the SL500
library:
■ Bus phases
■ Bus signals
■ Bus conditions
■ Pointers
■ Messages
■ Commands
■ Status byte
Bus Phases
The SCSI bus uses eight states, called bus phases, to establish and control
connections between the initiator and the target:
■ Bus Free
■ Arbitration
■ Selection
■ Reselection
Information Transfer phases:
■ Message (in or out)
■ Command
■ Data (in or out)
■ Status
Each bus phase is governed by a predetermined set of rules established by SCSI.
Note – The SCSI bus can only be in one phase at a time.
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