User's Manual

DLT2000 SCSI Interface
DLT2000/DLT2700 Cartridge Tape Subsystem 8-93
8.4.14 READ BUFFER (3Ch)
Bit
76543210
0 Operation Code (3Ch)
Logical Unit Number Reserved Mode
(MSB)
Byte
(LSB)
Allocation Length
Unused Flag
Buffer Offset
Buffer ID
1
(MSB)
(LSB)
Reserved
2
Link
3
4
5
6
7
8
9
Figure 8-60 READ BUFFER CDB
READ BUFFER is used in conjunction with WRITE BUFFER as a diagnostic function
for testing the drive's data buffer and the SCSI bus integrity.
Mode
The drive supports the following values within the field. If any nonsupported value is
set, the drive terminates the command with a CHECK CONDITION status and an
ILLEGAL REQUEST sense key set.
Mode Description
Combined Header and Data
Data
Descriptor
000b
010b
011b
Figure 8-61 READ BUFFER Modes Supported
Buffer ID & Offset
The drive only supports a single Buffer ID field of zero, and offsetting of data is not
supported. If these fields are nonzero, the drive returns a CHECK CONDITION status
with an ILLEGAL REQUEST sense key set.