CDU-541
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
5.2.33.
START/STOP
UNIT
Command
==============================================================================
Bit:
7
6
5
4
3
2
1 o
Byte
:
==============================================================================
o :
Operation
Code
(lBh)
1
-----1-----------------------------------------------------------------------1
1 :
Logical
Uni t
Number:
Reserved:
Immed
-----i-----------------------------------------------------------------------
2 i
Reserved
-----I----------------------------------------------~------------------------
3 1
Reserved
-----1-----------------------------------------------------------------------
4 I
Reserved
I LoEj I
Start
f
-----1-----------------------------------------------------------------------1
5 I
Control
Byte
I
==============================================================================
The
START/STOP
UNIT
command
requests
that
the
controller
enable
or
disable
the
logical
unit
for
further
operations.
An
immediate
(Immed)
bit
of
one
indicates
that
status
will
be
returned
as
soon
as
the
operation
is
initiated.
An
Immed
bit
of
zero
indicates
that
status
will
be
returned
after
the
operation
is
completed.
A
load/eject
(LoEj)
bit
of
zero
indicates
that
no
action
is
to
be
taken
regarding
loading
or
ejecting
the
disc.
A LoEj
bit
of
one
indicates
that
the
disc
is
to
be
unloaded
if
the
start
bit
is
zero.
A
start
bit
of
one
requests
the
logical
unit
be
made
ready
for
use.
A
start
bit
of
zero
requests
that
the
logical
unit
be
stopped.
LoEj
Start
Description
o
o
1
1
o
1
o
1
spin
down
the
disc,
optical
pick-up
is
not
moved
spin
up
the
disc.
seek
to
last
address
requested
spin
down
the
disc.
eject
the
caddy
not
supported
If
a
PREVENT
MEDIUM
REMOVAL
command
has
been
issued.
a
request
to
eject
the
disc
will
be
terminated
with
a
CHECK
CONDITION
status.
The
sense
key
will
be
set
to
ILLEGAL
REQUEST,
and
the
additional
sense
code
set
to
PREVENT
BIT SET.
5-60
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