Hitachi ULTRASTAR 15K450 HUS154530VLF400 - Manual (Page 105)

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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The Extension field is used to specify any additional bit flag, parameters, or other information defined by the document asso-
ciated with the Capability Entry. The drive does not currently make use of Extension field, therefore all Capability Entries
returned by the drive are 4 bytes in length.
17.3.13 Re-instate Recovery Qualifiers (RRQ)
The Re-instate Recovery Qualifier (RRQ) can be sent by the Initiator to the drive, as an indication that the Recovery Qualifier
(S_ID, D_ID, OX_ID, RX_ID, SEQ_ID, and SEQ_CNT) for an aborted exchange may be reused. RRQ is not required by the
drive following an aborted exchange. Following an ABTS the drive allows immediate reuse of the Recovery Qualifier. The
drive responds to RRQ with a valid ACC.
The following tables show the RRQ payload and the RRQ ACC payload.
Table 67: RRQ payload
Table 68: RRQ ACC payload
The drive performs no protocol checking on the RRQ payload. When it recognizes an ELS with 12h in byte 0, it simply
responds with an RRQ ACC.
Byte Item Size (Bytes)
0-3 Command Code = 12000000h 4
4 reserved 1
5-7 Originator S_ID 3
8-9 OX_ID 2
10-11 RX_ID 2
12
-
43
Association Header (Opt) 32
Byte Item Size (Bytes)
0-3 ACC Code = 02000000h 4