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.
5-36
To Next Page
Loading...
