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SCSI PACKETS
7-10
7
Attach/Detach Packet (all devices)
For common command set refer to Appendix A. The following SCSI
commands are executed during an attach:
NOTES:
There may be any number of scatter/gather entries.
The scatter/gather table must be in local MVME147 RAM (the DMA
channel does not table walk offboard RAM).
Table address must be longword aligned.
COMMAND
CONTROLLER
DEVICE NAME COMMAND NOTES
SCSI
Wincheste
r
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.
Test unit ready $00 Checks whether the selected
device is ready.
Mode sense $1A To check the block size. If the
block size in the packet is
different than the
controller/drive setting, all
reads/writes are blocked and
an "attach error" is returned.