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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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