CDU-541
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
5.2.7.
PLAY
AUDIO(lO)
Command
==============================================================================
ait:
7
6
5
4
3
2 1
o
Byte :
==============================================================================
o :
Operation
Code (45h) :
-----i-----------------------------------------------------------------------i
1 :
Logical
Unit
Number:
Reserved
:
-----:-----------------------------------------------------------------------:
2 I
(MSB)
:
---I
3 :
Starting
Logical
Block
Address
---I
4 1
1
---I
5
(LSB)
1
-----,-----------------------------------------------------------------------1
6 I Reserved I
-----i-----------------------------------------------------------------------1
7 :
(MSB)
I
-----1---
Transfer
Length ---I
8 I
(LSB)
I
-----1-----------------------------------------------------------------------1
9 I
Control
Byte
I
==============================================================================
The
PLAY
AUDIO
command
requests
that
the-target
play
audio
starting
at
the
specified
logical
block
address
for
the
specified
transfer
length.
The
audio
is
output
as
specified
by
the
audio
control
parameters
MODE
SELECT
PAGE
CODE
9.
The
status
returning
condition
depends on
the
Immd
bit
of
MODE
SELECT
page
code 9. The
Immd
bit
in
MODE
SELECT
page
code
9
of
one
requests
that
this
command
return
the
status
byte
when
the
address
requested
is
found. The
Immd
bit
in
MODE
SELECT
page
code 9
of
zero
requests
that
this
command
return
the
statuas
byte
when
reading
operation
of
data
transfer
length
specifird
byte
7
and 8 above
is
completed,
or
an
error
occurs.
If
the
address
is
not
found •
or
if
the
ready
condition
does
not
exist,
or
if
the
address
is
not
within
an
audio
track,
a
CHECK
CONDITION
status
will
be
returned
and
the
appropriate
sense
key
set.
If
the
transfer
length
is
zero
this
command
seeks
to
the
specified
logical
block
address
and
enters
the
hold
track
state.
If
any commands
related
to
audio
operations
AUDIO
command
shall
be
implemented
to
allow
a
determine
if
audio
operations
are
supported.
AUDIO
command
which
has
a
transfer
length
of
and
setting
the
sense
key
to
ILLEGAL
REQUEST
operations.
5-17
are
implemented
then
the
PLAY
method
for
the
initiator
to
A
target
responding
to
a
PLAY
zero
with
CHECK
CONDITION
status
does
not
support
audio
play
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