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CDU-54! CD-ROM DRIVE SCSI INTERFACE MANUAL
5.2.11. PLAY TRACK
Command
=====================================================a========================
Bit:
7
6
5
4
3
2
1
a
Byte :
==============================================================================
o
:
Operation Code (C6h)
:
-----------------------------------------------------------------------:
!
Logical Uni t Number:
Reserved
:
-----------~-----------------------------------------------------------1
2
Reserved
1
______________________________________________________ - - - - - - - - - - - ______ 1
3
.
Reserved
.
-----1-----------------------------------------------------------------------
4
I
Starting Track
-----1-----------------------------------------------------------------------
5
1
Starting Index
-----1-----------------------------------------------------------------------
6
I
Reserved
-----1-----------------------------------------------------------------------
7
i
Reserved
-----1-----------------------------------------------------------------------
8
1
Number of Indexes
-----1-----------------------------------------------------------------------
9
1
Control Byte
==============================================================================
The PLAY TRACK command requests that the· target play audio starting at the
specified starting track and index for the specified number of indexes.
The
audio is output as specified by the audio control parameters.
The starting track field specifies the track number of the audio track.
The
starting index field specifies the index number within starting track to begin
the audio play operation.
NOTE: The current firmware in the controller only supports a starting
index of one.
The number of indexes specifies the duration of the audio play operation.
If the value in the number of indexes field exceeds the number of indexes
within the track the play operation will continue until the end of the track
request.
A value of FFh requests that the play operation continue until the
lead-out track or a non-audio track is detected.
IMPLEMENTORS NOTE:
A typical audio track for music has only one index
number (i.e. the number of indexes is equal to one.)
The number of indexes
within a track in not obtainable from data in the table of contents.
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 number of the starting address specified is the same as that of the
ending address, the audio data on the track is output.
5-22
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