Fujitsu M2488 manual Read Block Limits command 05h, Read Block Limits CDB Description

TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE

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.

						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.

Variable and fixed length blocks are supported. Refer to Table 4-62 for the READ BLOCK LIM- ITS data.

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.

4-68 CG00000-011503 REV. A April 1997