Fujitsu M2488 manual Locate command 2Bh, Locate CDB Description, Locate Field Description, Lsb

TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE

4-3.8 LOCATE command 2Bh

The LOCATE command causes the tape unit to position to a specific logical location. The Block address field specifies the target location; the logical unit positions in front of the block associated with the Block address (i.e. on the BOT side of the block.) Any buffered write data and filemarks are written to the tape before the locate operation occurs.

4-3.8.1 LOCATE CDB Description

LOCATE is a ten-byte command. The bytes are shown below and described in Table 4-25. Com- mon 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	1		0			1	0		1		1
1
			LUN					Reserved			BT		CP		Immed
2								Reserved
3		MSB
4
							Block Address
5
6																LSB
7								Reserved
8								Partition
9
					Reserved								Flag			Link

Note: Changeable fields in the CDB are shaded.

Table 4-25. LOCATE Field Description

BYTE	BIT	VALUE	DESCRIPTION
0	0-7	2Bh	Operation code.
1	0	0	If Immed (Immediate) =0, status is not returned for the LOCATE com-
			mand until the locate operation has completed or has failed
		1	If Immed bit = 1, status is returned for the LOCATE command as soon as
			the CDB has been validated and any buffered write data and filemarks have
			been written to tape. The locate operation has been started but not neces-
			sarily completed when status is returned.
1	1	0	If CP bit =0, the Change Partition field is ignored. (The tape format only
			supports one partition, partition 0, so this field should only be set to 0 when
			the CP bit is set to 1.)
		1	If CP bit =1, the Change Partition field specifies the target partition.

4-28 CG00000-011503 REV. A April 1997