Table of Contents
Advertisement
CDU-541 CD-ROM DRIVE SCSI INTERFACE MANUAL
5 .2.21. READ SUB-CHANNEL Command
==============~======================================= ========================
Bit
I
Byte
I
7
6
5
4
3
2
1
a
==============================================================================
o
:
Operation Code (C2h)
:
-----i-----------------------------------------------------------------------:
,
: Logical Unit Number:
Reserved
i
-----:-----------------------------------------------------------------------i
2
iReservedi
Sub
Q :
Reserved
I
-----i-----------------------------------------------------------------------
3 1
Reserved
-----i-----------------------------------------------------------------------
4
:
Reserved
-----1-----------------------------------------------------------------------
5
1
Reserved
-----1-----------------------------------------------------------------------
6
I
Reserved
I
-----1-----------------------------------------------------------------------1
7
1
(MSB)
I
-----1---
Allocation Length
---I
8
i
(LSB)
I
-----1-----------------------------------------------------------------------1
9
:
Control Byte
:
==============================================================================
The READ SUB-CHANNEL command requests that the target return the requested
sub-channel data of the current block.
The data format returned is specified
by the LBAMSF bit of MODE SELECT page code
8.
The LBAMSF bit of zero
indicates that the target will return LBA data format.
The LBAMSF bit of one
indicates that the target will return MSF data format.
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.
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 returning data from the other sub-channels is not
permitted by the medium standards.
5-38
Advertisement
Table of Contents
