Fujitsu manual Media Changer Commands M2488 Product Guide, Exchange Medium MC command A6h

MEDIA CHANGER COMMANDS M2488 PRODUCT GUIDE

6-2.1 EXCHANGE MEDIUM MC command A6h

The EXCHANGE MEDIUM medium-changer command provides a means to exchange the medium in the source element, with the medium located at a destination element.

The medium in the source element is moved to the first destination element and the medium that pre- viously occupied the first destination element is moved to the second destination element. The sec- ond destination element may or may not be the same element as the source element. In the case of a simple exchange, the source element and the second destination element are the same.

This device can emulate the capability of handling two units of media at the same time. The ACL cannot perform exchange medium operations. The FACL can perform an exchange medium opera- tions if the tape unit is empty.

6-2.1.1 EXCHANGE MEDIUM CDB Description

EXCHANGE MEDIUM is a twelve-byte command. The bytes are shown below and described in the following paragraphs. Common fields are described in paragraph 4-3.1 on page 4-4.

								BITS
BYTES	7		6	5		4			3	2	1		0
0	1		0	1		0			0	1	1		0
1
			LUN							Reserved
2-		MSB
						Transport Element Address
3
														LSB
4-		MSB
							Source Address
5
														LSB
6-		MSB
						First Destination Address
7
														LSB
8-		MSB
						Second Destination Address
9
														LSB
10								Reserved
11
					Reserved							Flag		Link

Note: Changeable fields in the CDB are shaded.

This command will only accept Transport element addresses of 0000h (default) or 000Eh (Trans- port Element address).

For this product, the Source address, First destination address, and Second destination addresses are storage elements.

When the Source address, First destination address, and Second destination addresses have the same value, this command performs no operation.

When the Source address and the First destination address have the same value and the second destination addresses has a different value, you are attempting to perform a simple MOVE MEDIUM and this EXCHANGE MEDIUM command is accepted.

The device capabilities page (XCL MODE parameters page 1Fh) provides a matrix which defines the supported source element type and first destination element type combinations for

6-2 CG00000-011503 REV. A March 1997