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CDU-541 CD-ROM DRIVE SCSI INTERFACE MANUAL
The block length requests that the controller use the logical block length
specified for data transfers.
The controller will accept the block lengths as
shown in Table 5-4.
Any other value will be considered an error.
The command
will be terminated with a CHECK CONDITION status.
The sense key is set to
ILLEGAL REQUEST and the additional sense code is set to INVALID FIELD IN
PARAMETER LIST.
The block length is applicable to the whole disc except the
audio tracks.
Table 5-4: Block Lengths for CD-ROM
==============================================================================
Block
Length
Description
-------+----------------------------------------------------------------------
256
256 bytes of user data CD-ROM mode one data required
512
512 bytes of user data CD-ROM mode one data required
1024
1024 bytes of user data CD-ROM mode one data required
2048
2048 bytes of user data CD-ROM mode one data required
2336
2048 bytes of user data
&
288 bytes ECC data if CD-ROM mode one data
2336 bytes of user data if CD-ROM mode two data
2340
4 byte header
&
2048 bytes of user data
&
288 bytes ECC data if
CD-ROM mode one data
4 byte header
&
2336 bytes of user data if CD-ROM mode two data
==============================================================================
A block length of 2336 or 2340 can be specified for CD-ROM mode one or CD-
ROM mode two data.
If a read operation is requested on a track that is CD-ROM
mode two data and L-EC is not disabled 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.
Each page descriptor specifies parameters for the controller to use for
subsequent operations on the specified logical unit.
The page descriptors are
specified in section 5.3.
The parameter length field specifies the length in
bytes of the parameters that follow for that page.
The initiator shall set
this value to the value that is returned in the parameter length field for the
same page by the MODE SENSE command.
If this condition is not met, the
controller will terminate the command with a CHECK CONDITION status.
The
sense key is set to ILLEGAL REQUEST and the additional sense code is set to·
INVALID FIELD IN PARAMETER LIST.
5-10
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