Seagate Fibre Channel Interface - Manual (Page 67)

Fibre Channel Interface Manual, Rev. D 53
DF_CTL (Data Field Control)
Set to 00h to indicate no optional Fibre Channel headers are used.
F_CTL (Frame Control)
Set to 090000h for the ABTS. This indicates the ABTS is from the originator of the exchange, this is the last frame of the
sequence, and sequence initiative is transferred for the drive to send the reply back.
For the reply frames, the drive sets the F_CTL to 990000h. This indicates the frame is from the responder, this is the last
sequence, this is the last frame of the sequence, and sequence initiative is returned to the initiator.
OX_ID (Originator Exchange Identifier)
The OX_ID for the sequence being identified by the basic link service.
Parameter
Not used for basic link services.
R_CTL (Routing Control)
The basic link service frame. See the description of each basic link service below for the R_CTL value.
RX_ID (Responder Identifier)
Not used by the drive. The value of FFFFh indicates the RX_ID is not being used.
S_ID (Source Identifier)
The address of the initiator that sent the frame for ABTS. For the basic link service replies, the S_ID contains the address of
the drive.
SEQ_CNT (Sequence Count)
Set to 0000h to indicate this is the first frame of the Fibre Channel sequence.
SEQ_ID (Sequence Identifier)
Contains the last used SEQ_ID for the exchange for ABTS. The drive does not check the SEQ_ID as the entire exchange
(command) is aborted by the error recovery process. The drive returns the same SEQ_ID in the reply frame as received
from the initiator in the ABTS.
Type
00h
Used for all basic link services frames.
9.1.1 Abort Sequence (ABTS)
The Abort Sequence (ABTS) is sent by the initiator to abort a single SCSI exchange (command) or FC
exchange (one of the link service operations). The ABTS frame does not have a payload. All the information is
included in the header.
The R_CTL is 81h.
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