Acer HDS AMS200 Reference Manual page 332

D_ID (Destination ID):
This indicates the transmission destination of a frame. D_ID of the frame from the SCSI
command issuer side (Exchange originator) is the target ID of SCSI-3.
S_ID:
This indicates the transmission destination of a frame. S_ID of the frame from the SCSI
command issuer side (Exchange originator) is the initiator ID of SCSI-3.
TYPE (Data structure type):
In the TYPE field of all frames of the FCP sequence, 0x08 is set.
F_CTL (Frame control):
This consists of fields for controlling start of the sequence and exchange, and normal
and abnormal terminations. For further details, refer to the FC-PH standard.
SEQ_ID (Sequence ID):
This indicates an order of the frames in the sequence. For further details, refer to the
FC-PH standard.
DF_CTL (Data field control):
This indicates whether there is an optional header or not. The FCP requires no optional
header.
OX_ID (Originator exchange ID):
This indicates the exchange ID on the starting side of the exchange (initiator) and
corresponds to the tag number of SCSI-3. (OxFFFF cannot be specified.)
RX_ID (Responder exchange ID):
This indicates the exchange ID on the responding side of the exchange (target).
Any value may be given to this. The responding side of the exchange can assign a unique
value to OX_ID (tag).
RLTV_OFF (Relative offset):
In the FCP-DATA IU, the offset (offset on the buffer allocated by the host) of the top
byte of the payload of each frame is set. In other IU frames, 0 is set.
312 Appendix D Interfaces