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Attach/Detach Packet (all devices)
7-11
7
An attach is required before any other commands may be sent to the SCSI
firmware (except custom SCSI sequence or Bus Reset).
An attach call initializes the SCSI firmware pointers and internal flags. A RAM
work area is used by SCSI firmware for building internal pointers and also
contains the command sent to the SCSI controller. The RAM work area should
not be reallocated until the device is detached or reset.
COMMAND
CONTROLLER
DEVICE NAME COMMAND NOTES
TAPE Rewind $01 A rewind command is sent (2.0
firmware and later) because
many tape devices require the
tape to be at BOT to send a
mode select command.
Reserve device $16 Executed on attach if reserve-
on-attach/release-on-detach bit
is set in packet. A reserve
device command is sent to the
controller. A reserve device
command can be used in a
multi-initiator SCSI environ-
ment to reserve the device.
Release device $17 Executed on detach if reserve-
on-attach/release-on-detach bit
is set in packet. A release
device command is sent to the
controller, and the firmware
clears an internal attach flag. A
release device command can be
used in a multi-initiator SCSI
environment to release the
device.
Mode select $15 This command configures the
controller for operat-ional
parameters.
Test unit ready $00 Checks whether the selected
device is ready.