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CDU-541 CD-ROM DRIVE SCSI INTERFACE MANUAL
4.6. Disconnect/Reconnect
If the disconnect privilege is granted, and the Disconnect/Reconnect
parameters are in the default setting, the controller will disconnect after
the command phase for any command that requires a seek operation.
The controller will attempt to reselect the initiator after a disconnect has
occurred.
A minimum delay of 200 milliseconds will elapse between each
attempt.
The reselection procedure will continue until the initiator
reselected responds or until a BUS DEVICE RESET or COMMAND ABORT message is
received from that initiator or until the RST signal is asserted.
4.7. Disc Compatibility
The controller is designed to work with any disc that meets the Sony-Philips
"red-book" or "yellow-book" documents at the current revision level.
The
drive will read CD-ROM data discs in mode one or mode two, digital audio
discs, and audio- combined discs (i.e. some tracks are audio, some tracks are
data) .
It is recommended for the efficient performance of the interface that post-
gap areas be encoded as CD-ROM data in mode zero.
4.8.
TOe
Recovery Strategy
The recovery of the TOC data is required before a logical unit is ready and
data can be read from the disc.
The TOC data is written several times in the
area set up for TOC data.
The exact number of repetitions depends on the
number of tracks on a disc.
The following TOC recovery strategy attempts to
maximize the chance of recovering the TOC data.
The drive attempts to recover the TOC as soon as a caddy is successfully
loaded.
The time maximum time to recover a TOC that is read without error is
approximately five seconds.
The repeated
TOe data can be up to two minutes
long.
Following this strategy the drive will continue in its attempts to
recover the TOC data until the end of the TOC data area is reached.
Any command received during the TOC read operation will be terminated with a
CHECK CONDITION status.
The sense key is set to NOT READY and the additional
sense code is set to TOC READ IN PROGRESS.
If the drive reaches the end of the TOC data area without successfully
recovering the TOC data the controller will respond to all subsequent commands
that imply a disc access with a CHECK CONDITION status (see 4.1.4).
The
sense key is set to NOT READY and the additional sense code is set to UNABLE
TO RECOVER TOC.
4-11
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