Reserve (6)
222 SL500: Interface Reference Manual • July 2008 Revision: F • 96122
Reserve (6)
The 6-byte Reserve command (16h) allows the initiator to perform unit reservations
or element reservations. Unit reservations are reservations of the library as a
whole. Element reservations are reservations of specific elements of the library.
TABLE 6-93 Reserve Command
Byte
Bit
76543210
0Operation Code (16h)
1Ignored Obsolete (0h)Element
2 Reservation Identification
3
to
4
(MSB)
Element List Length
(LSB)
5Control Byte (00h)
Reserve (6) Command Definitions:
Element This bit indicates if the reserve is an element reserve. The library supports
reservation at the element level:
■ 0 = The entire library unit is reserved.
■ 1 = A series of elements—identified by the Reservation Identification field
and specified by the Element List Descriptor—is reserved.
Reservation
Identification
This field is a value established by an initiator to identify a specific element
reservation request. The library supports a maximum of 64 element
reservations.
Note – Ignore this field if the Element bit is not set.
Element List Length This field indicates the length in bytes of the Element List that follows the
command. The list may include a maximum of 16 Element List Descriptors, each
of which is 6 bytes long.
Valid values are 0, 6, and increments of 6 up to the maximum of 60h (96d).
If the value is 0 and the Element bit is set, no elements are reserved.
Note – Ignore this field if the Element bit is not set.
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