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CDU-541 CD-ROM DRIVE SCSI INTERFACE MANUAL
5.2. 18. READ EXTENDED Command
==============================================================================
Bit:
7
6
5
4
3
2
1
o
Byte :
==============================================================================
o
:
Operation Code (28h)
I
-----1-----------------------------------------------------------------------1
1
:
Logical Unit Number
:
Reserved
:
-----:-----------------~-----------------------------------------------------:
2
:
(MSB)
:
-----1---
---I
3
:
I
-----1---
Logical Block Address
---I
4
I
I
-----1---
---I
5
I
(LSB)
I
-----l-------------~---------------------------------------------------------:
6
I
Reserved
I
-----1-----------------------------------------------------------------------:
7
I
(MSB)
I
-----1---
Transfer Length
---I
8
I
(LSB)
I
-----i-----------------------------------------------------------------------1
9
i
Control Byte
I
==============================================================================
The READ EXTENDED
comma~d ~equests
that the
controlle~
transfer data to the
initiator.
The data will be transferred in whole blocks without delays
occurring during a block transfer.
The logical block address specifies the logical block at which the read
operation will begin.
The transfer length specifies the number of contiguous logical blocks of
data that will be transferred.
A transfer length of zero indicates that no
logical blocks will be transferred but the addressed drive will perform a seek
operation to the specified address.
This condition will not be considered as
an error.
Any other value indicates the number of logical blocks that will be
transferred.
See the READ command for exception handling description.
5-33
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