Sony CDU-541 Interface Manual page 58

CDU-541 CD-ROM DRIVE SCSI INTERFACE MANUAL
5.2.20. READ HEADER Colll.llland
==============================================================================
Bitl
Byte
I
7
6
5
4
3
2 1
o
=====-========================================================================
o
Operation Code (44h)
I
I
-----------------------------------------------------------------------1
1 Logical Unit Number : Reserved
I
MSF : Reserved
2
(MSB)
3
4
5
Logical Block Address
(LSB)
-----,-----------------------------------------------------------------------
6 Reserved
7
(MSB)
Allocation Length
8
(LSB)
9
Control Byte
==============================================================================
The
R~~D H~~DER
command requests that the target return the CD-ROM data
header for the specified logical block. In case of the block size smaller
than 2048 bytes, the header date of the block including the specified logical
block address will be returned. See the READ command for exception handling.
The logical block address field specifies the logical block at which the
read header operation shall begin.
The address format returned is specified by MSF bit as follows.
o If MSF bit is equal to 1. it is minutes. second and frame format.
o If MSF bit is equal to O. it is the logical block address format.
The CD-ROM data header format returned is defined as follows.
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