TAPE UNIT SCSI COMMANDS
M2488 PRODUCT GUIDE
4-68
CG00000-011503 REV. A
April 1997
4-3.15
READ BLOCK LIMITS command 05h
The READ BLOCK LIMITS command requests the target’s block length limits for the logical unit.
The READ BLOCK LIMITS data, shown in Table 4-62, is sent during the DATA IN phase of the
command.
4-3.15.1
READ BLOCK LIMITS CDB Description
READ BLOCK LIMITS is a six-byte command. The bytes are as shown below and described in
Table 4-61. Common fields are described in paragraph 4-3.1 on page 4-4.
Variable and fixed length blocks are supported. Refer to Table 4-62 for the READ BLOCK LIM-
ITS data.
BITS
BYTES
7
6
5
4
3
2
1
0
0
0
0
0
0
0
1
0
1
1
LUN
Reserved
2
Reserved
3
Reserved
4
Reserved
5
Reserved
Flag
Link
Note: Changeable fields in the CDB are shaded.
Table 4-61. READ BLOCK LIMITS Field Description
BYTE
BIT
VALUE
DESCRIPTION
0
0-7
05h
Operation code.
Table 4-62. READ BLOCK LIMITS Data
BYTE
BIT
VALUE
DESCRIPTION
0
0-7
Reserved.
1-3
040000h (262,144)
The maximum block length is the maximum number of bytes the host can
request via a read or write operation.
The maximum block length conforms to the maximum specified in the
ANSI Extended Magnetic Tape Format for Information Interchange 36
Track, Parallel Serpentine proposed specification X3B5/94-043 section
8.2.
4-5
0001h
The minimum block length supported is one byte. The minimum block
length indicates the minimum number of bytes that can be read from or
written to the MTU.
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