Acer HDS AMS200 Reference Manual page 325

Header
The format of the Frame Header is shown in Table D.6.
Table D.6 Frame Format
Bits/Word 31 to 24
0 R_CTL
1 Reserved
2 TYPE
3 SEQ_ID
4 OX_ID
5 Parameter
R_CTL (Routing Control):
The R_CTL field is used to categorize the frame function. Classification into the link
control frame and data frame is done by the R_CTL.
D_ID (Destination ID):
The D_ID field contains the address identifier of an N_Port or F_Port within the
destination entity.
S_ID (Source ID):
The S_ID field contains the address identifier of an N_Port or F_Port within the source
entity.
TYPE (Data Structure Type):
The TYPE field identifies the protocol of the frame content for Data Frames.
F_CTL (Frame Control):
The F_CTL field contains control information relating to the frame contents.
The control information includes the Exchange Context, Sequence Context, etc.
SEQ_ID (Sequence ID):
The SEQ_ID field contains the SEQ_ID assigned by the Sequence Initiator, and it shall be
unique for a specific D_ID and S_ID pair while the Sequence is Open.
DF_CTL (Data Field Control):
The DF_CTL field specifies the presence of optional headers at the beginning of the Data
Field.
SEQ_CNT:
The SEQ_CNT field indicates the sequential order of Data Frame transmission within a
single sequence or multiple consecutive sequences for the same Exchange.
OX_ID (Originator Exchange ID):
The OX_ID field identifies the Exchange ID assigned by the Originator of the Exchange.
Each Exchange shall be assigned an identifier unique to the Originator or Originator-
Responder Pair.
RX_ID (Responder Exchange ID):
The RX_ID is an identifier of the exchange assigned by the responder of the exchange. It
is unique and locally significant for the responder.
23 to 16 15 to 08
D_ID
S_ID
F_CTL
DF_CTL SEQ_CNT
RX_ID
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