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CDU-541 CD-ROM DRIVE SCSI INTERFACE MANUAL
4.9.
Audio
Playback Impleaentat10n Rules
The rules for audio playback operations:
1) The starting audio address must be specified before a playback operation
can occur.
The controller will set the ending audio address if any audio
tracks exist on the disc to the address of the next track index one minus one
block.
If a playback operation is requested and no audio tracks exist the
playback operation will be terminated with CHECK CONDITION status.
The sense
key will be set to ILLEGAL REQUEST and the additional sense code set to AUDIO
ADDRESS NOT VALID.
2)
The audio addresses will be valid until a reset condition, a medium
change occurs or until another command is received with a new audio address.
3} The audio addresses must be within an audio track.
If the audio address
is not within an audio track the command will be terminated with a CHECK
CONDITION status.
The sense key will be set to ILLEGAL REQUEST and the
additional sense code set to ILLEGAL MODE FOR THIS TRACK.
4) If a change in bit one of the control field is detected the playback
operation will be terminated with a CHECK CONDITION status.
The sense key
will be set to ILLEGAL REQUEST and the additional sense code set to
END
OF
USER
AREA
ENCOUNTERED ON THIS TRACK.
If any of the following
condi~ions
occur and the drive has not detected the
ending audio address audio play operation will continue on the next track.
a)
an index equal zero is detected (i.e. pre-gap detected).
b)
a track number change is detected (i.e. lead-out).
.
The ending audio address may be set while audio play is in progress.
If the
ending address requested is not greater than the current address the audio
play operation will stop and the drive will enter the hold track state.
5) The audio play operation will not be interrupted by the following
commands received by the controller.
The value in parentheses is the command
code.
TEST UNIT READY
REQUEST SENSE
INQUIRY
RESERVE
RELEASE
MODE SELECT
MODE SENSE
RECEIVE DIAGNOSTIC RESULTS
READ CAPACITY
WRITE BUFFER
READ BUFFER
READ
roc
(Clh)
READ TOC (43h)
READ SUB-CHANNEL (C2h)
READ SUB-CHANNEL (42h)
PLAYBACK STATUS
PAUSE with Pause bit=O
The actual starting audio address will be within four q-subcode addresses of
the requested
s~arting
audio address.
The reason is the reliability of
reading the q-subcode address.
The current audio players carry through if
they miss a q-subcode address.
4-12
'--.--
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