Fujitsu M2488 manual Element Status Data Header Field Description

MEDIA CHANGER COMMANDS M2488 PRODUCT GUIDE

6-2.5.2.1 Element Status Data

The Element status data header is an 8 byte block; a diagram of this block is shown in Table 6- 21 and described in Table 6-22.

Table 6-21. Element Status Data Header

						BITS
BYTES	7	6	5		4		3	2	1	0
0-	MSB			First Element Address Reported
1										LSB
2-	MSB			Number of Elements Available
3										LSB
4						Reserved
5-	MSB)			Byte Count of Report Available
7										LSB

Table 6-22. Element Status Data Header Field Description

BYTE	BIT	VALUE	DESCRIPTION
0-1			The First element address reported field contains the smallest element address of
			those elements that meet the requirements defined in the CDB parameters. This
			value is not adjusted for the allocation length.
2-3	0		The Number of elements available field indicates the number of element descriptors
			that meet the requirements defined in the CDB request. This value is not changed
			because of insufficient allocation length. By definition, the value in the Number of
			elements available field will always be less than or equal to the Number of elements
			field in the CDB. This value is not adjusted for the allocation length.
5-7	2		The Byte count of report available field indicates the total number of bytes in the
			element status pages based upon the requirements of the CDB request. This value is
			not adjusted for the allocation length.

None of the fields in the Element status data header are adjusted if the allocation length is insuf- ficient to send all status data available. Note that a READ ELEMENT STATUS command can be issued with an Allocation length of 8 to determine the allocation length needed to transfer all element status page bytes specified by the command; the allocation length needed is the value reported in the Byte Count of Report Available field plus 8.

6-22 CG00000-011503 REV. A March 1997