Seagate Fibre Channel Interface User Manual
Page 71
Fibre Channel Interface Manual, Rev. D
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Field definitions (listed alphabetically)
D_ID (Destination Identifier)
Frame destination address.
DF_CTL (Data Field Control)
Set to 00 to indicate no optional Fibre Channel headers are used.
F_CTL (Frame Control)
Set to 290000h for extended link service requests. This indicates the frame is from the originator of the exchange, this is
the last frame of the sequence, and sequence initiative is transferred for the responder to send the reply back.
For the reply frames, the F_CTL is set 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 originator.
OX_ID (Originator Exchange Identifier)
The drive sends 0000 to the OX_ID field in extended link services requests it originates. For extended link services replies,
the drive uses the OX_ID value received from the initiator.
Parameter
Not used for extended link services.
R_CTL (Routing Control)
22h
Extended link services and unsolicited control for extended link service request, PLOGI, PRLI, RLS, RRQ, and
PDISC.
23h
Extended link services and solicited control for replies, ACC and LS_RJT.
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 originator of the frame. This address is used by the destination to return any responses that may be
required by the operation.
SEQ_CNT (Sequence Count)
Not checked by the drive. For extended link services replies and requests sent by the drive, SEQ_CNT equals 0000.
SEQ_ID (Sequence Identifier)
Not checked by the drive. For extended link services replies, the drive uses the SEQ_ID value received from the initiator.
The drive sends SEQ_ID equal to FFh for extended link services requests it originates.
Type
01h
All extended link services frames.
Table
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