Generate Recommended Access Order Command
44 T10000: Interface Reference Manual August 2016
Generate Recommended Access Order Command
The Generate Recommended Access Order (GRAO) command generates a
recommended access order for the User Data Segments that are sent by the command
as parameter data. The GRAO command is defined by an operation code and Service
Action. The GRAO parameter list is processed before status for the command is
returned. After the GRAO command completes the Receive Recommended Access
Order (RRAO) command can be used to receive the results in the form of a
Recommended Access Order (RAO) list.
TABLE 3-8 Generate Recommended Access Order Command
Byte
Bit
76543210
0 Operation Code(A4H)
1 Reserved Service Action (11h)
2 Reserved
RAO Process
3 Reserved
UDS_Type
4
thru
5
Reserved
6
thru
9
(MSB)
Parameter List Length
(LSB)
10 Reserved
11 Control Byte
Parameter Value
RAO Process: Method used to
generate RAO list
000b = List of user data segments not reordered, estimated
locate times from current position to first logical block
001b = List of user data segments not reordered, estimated
locate times from current position to first logical block and
then from last logical block in previous user data segment to
first logical object in this user data segment.
010b = List of user data segments is reordered into the
recommended access order, estimated locate times from
current position to first logical block in the reordered list and
then from last logical block in previous user data segment to
first logical object of this user data segment.
000b = List of user data segments not reordered, estimated
locate times from beginning of partition 0 to the position to
first logical block in each user data segment.
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