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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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