Seagate Fibre Channel Interface - Manual (Page 112)

98 Fibre Channel Interface Manual, Rev. D
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 CT 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 CT services.
R_CTL (Routing Control)
02h
Unsolicited control for CT service request, PDISC.
03h Solicited control for responses.
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 CT services requests, the drive uses the SEQ_ID value equal to FFh.
Type
20h
Fibre Channel services.
Table
number
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