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The Basic Link Services supported by this drive are the Abort Sequence (ABTS) and its
responses, Basic Accept (BA_ACC) and Basic Reject (BA_RJT). Other Basic Link Services
are discarded.
The header field of the Basic Link Service is defined below.
Word
0
1
Header
<R_CTL>
0
8x
1
Reserve
2 <TYPE>
00
3 <SEQ_ID
<DF_CTL>
>
4
<OX_ID>
5
<Parameter>
1 - 28
2
3
Byte
<D_ID>
<S_ID>
<F_CTL>
<SEQ_CNT>
<RX_ID>
C141-E054-02EN
(1) R_CTL.. (Routing Control)
The high order four bits (8h) represent Basic
Link Service, and the low order four bits each
Basic Link Service.
(2) D_ID.. (Destination Identifier)
•
Address of the drive which receives ABTS.
•
Address of the initiator for a response to
ABTS.
(3) S_ID.. (Source Identifier)
•
Address of the initiator which sends
ABTS.
•
Address of the drive for a response to
ABTS.
(4) Type
The Basic Link Service uses 00h.
(5) F_CTL.. (Frame Control)
•
Set 09000000h for the transmission of
ABTS.
(Originator of Exchange, Last Data Frame
of Sequence, Transfer Sequence Initiative)
•
Set 99000000h for a response to ABTS.
(Responder of Exchange, Last Sequence of
Exchange)
(6) SEQ_ID.. (Sequence Identifier)
The drive does not check this item. For a
response to ABTS, respond with the same
SEQ_ID as received.
(7) DF_CTL.. (Data Field Control)
Set 00h because no optional header is used.
(8) SEQ_CNT.. (Sequence Count)
Set 0000h to indicate the first frame of a
sequence.
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