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3-110 M3099GX/GH OEM Manual
Command
Sequence
This chapter describes about command and phase sequence related
to host system. SCSI-2 introduced PHASE, MESSAGE system, etc.,
for interfacing other than simple command passing, therefore, a lot
of sequences can be considerable. Below shows some typical case and
out recommendations of implementation SCSI protocol to the
system.
System Initialization
The following list of information is assumed necessary and sufficient
for normal system initialization:
1) A list of each installed and powered on SCSI device for each SCSI
address. SCSI devices that are not powered on are treated as not
installed, assuming that the terminators are powered from a
source other than unexpected SCSI devices.
2) A list of the installed logical units for each SCSI device.
Unpowered or failing logical units may not be completely
identifiable.
3) The device type for each available logical unit.
4) The manufacturer and model for each available logical unit. (this
information may not be available for SCSI-1 devices)
5) The critical device type information for each available logical
unit.
6) This information varies depending on the device type.
7) Extended functionality of SCSI devices such as target role
capability in
8) devices that are principally initiators, AEN capability, etc.
The following states are established for each attached logical unit that
has power available and is not failing:
1) The ready state for each available logical unit, including any
required medium initialization, but not initialization, but not
formatting.
2) All error conditions associated with the starting process are
cleared.
3) All UNIT ATTENTION conditions are cleared.
4) All data transfer parameters are established.
#03.pm5 98.2.22, 1:34 PM110