--~-
CDU-541
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
5.2.10.
PLAY
MSF
Command
==============================================================================
Bitl
Byte 1
7
6
5
4
3
2
1
o
;=============================================================================
o I
Operation
Code (C7h) I
-----1-----------------------------------------------------------------------1
1 I
Logical
Uni t Number I
Reserved
1
-----1-----------------------------------------------------------------------1
2 I
~eserved
I
-----1-----------------------------------------------------------------------:
3 :
Starting
Minutes
1
-----:-----------------------------------------------------------------------,
4 I
Starting
Seconds
-----1-----------------------------------------------------------------------
5 1
Starting
Frame
-----:-----------------------------------------------------------------------
6 1 Ending
Minutes
-----1-----------------------------------------------------------------------
7 I Ending
Seconds
-----1-----------------------------------------------------------------------
8 1 Ending Frame
-----1-----------------------------------------------------------------------
9 I
Control
Byte
==============================================================================
The
PLAY
MSF
command
requests
that
the
target
output
the
audio
signals
starting
at
the
specified
starting
address
and
continue
the
audio
play
operation
until
the
specified
ending
address
is
detected.
The
audio
signals
are
output
as
specified
by
the
audio
control
parameters.
The
Starting
minutes,
seconds,
frame
specify
the
starting
address
in
absolute
time.
The Ending
minutes,
seconds,
frame
specify
the
ending
address
in
absolute
time.
If
the
ending
address
is
less
than
the
starting
address
a
CHECK
CONDITION
status
is
returned.
The
sense
key
is
set
to
ILLEGAL
REQUEST
and
the
additional
sense
code
is
set
to
ILLEGAL
VALUE
IN
COMMAND
DESCRIPTOR
BLOCK.
This
command
returns
the
status
byte
when
the
address
requested
is
found.
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
starting
address
equals
the
ending
address
this
command
seeks
to
the
specified
address
and
enters
the
hold
track
state.
in
a
pause
condition,
issuing
a
PAUSE
command
with
the
pause
bit
will
begin
audio
play.
5-21
this
command
The
drive
is
set
to
zero
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