CDU-541
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
5 . 2
.22.
READ
SUB-CHANNEL Command
==============================================================================
Bit:
7
6
5
4
3
2
1 o
Byte
:
===============:========:==========================::=========================
a :
Operation
Code
(42h) :
-----1-----------------------------------------------------------------------:
1 :
Logical
Unit
Number
: Reserved :
MSF
I Reserved I
-----1-----------------------------------------------------------------------i
2.
I
Reserved
1
Sub
Q : Reserved I
-----------------------------------------------------------------------1
3
Reserved
I
-----------------------------------------------------------------------1
4 Reserved :
-----------------------------------------------------------------------:
5
Reserved
I
6
Reserved
7
(MSB)
Allocation
Length
8
(LSB)
9
MC
TC
Control
Byte
==============================================================================
The
R~~D
SL~-CH}_~EL
comm~~d
requests
that
the
target
return
the
requested
sub-channel
data
of
the
current
block,
but
only
Sub-Q Channel
data
will
be
returned
in
current
condition.
The Sub Q
bit
set
to
one
requests
the
target
return
the
Q
sub-channel
data.
The Sub Q
bit
set
to
zero
requests
that
no
data
be
returned.
This
shall
not
be
considered
an
error.
NOTE:
The
other
bits
in
this
byte
are
reserved
for
use
in
requesting
other
sub-channel
data.
The
bits
occur
in
the
sub-channel
in
P Q R
STU
V W
order.
At
present,
sub-channels
R,
S, T;
U,
V
amd
Ware
not
used.
5-41
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