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18 Fibre Channel Interface Manual, Rev. D
Start-of-frame Initiate Class 3 (SOFi3)
SOFi3 indicates the beginning of the first frame of a sequence of frames (an exchange). (This includes all sin-
gle frame sequences, commands, link services, transfer readys, and response frames.) SOFi3 is also used in
the first data frame of a sequence.
Start-of-frame Normal Class 3 (SOFn3)
SOFn3 indicates the beginning of any frame other than the first frame of an exchange (see SOFi3 above).
Start-of-frame Initialize Loop (SOFil)
SOFil is the same as SOFi3, but is renamed for use in Loop Initialization to remove the class of service distinc-
tion from the initialization process.
End-of-frame Normal (EOFn)
EOFn indicates the end of any frame other than the last frame of an exchange or sequence.
End-of-frame Terminate (EOFt)
EOFt marks the end of the last frame of all sequences. It can also indicate the end of the last frame of an
exchange. For example, the single frame sequences, commands, link services, transfer readys, and response
frames.
5.4.1.2 Primitive signals custom made for arbitrated loop topologies
There are eight primitive signals used exclusively within arbitrated loop (FC-AL) topologies. These primitives
are listed in Table 5 and defined in text following the table.
Arbitrate (ARBx)
ARBx is transmitted to request access to the loop. Each ARBx contains the Physical (port) Address (AL_PA) of
the requestor.
Arbitrate (ARB(F0))
ARB(F0) is transmitted to manage access fairness (see Section 8.3.1 on page 47). It is also used to assign a
loop master during initialization.
Table 5: FC-AL primitive signals
FC-AL primitive signal Signal
Beginning
running
disparity Ordered set (FC-1) Ordered set (hex)
Arbitrate ARBx Negative K28.5 D20.4 AL_PA AL_PA BC 94 AL_PA AL_PA
Arbitrate (F0) ARB(F0) Negative K28.5 D20.4 D16.7 D16.7 BC 94 F0 F0
Open full-duplex OPNyx Negative K28.5 D17.4 AL_PD AL_PS BC 91 AL_PD AL_PS
Open half-duplex OPNyy Negative K28.5 D17.4 AL_PD AL_PD BC 91 AL_PD AL_PD
Open broadcast replicate OPNfr Negative K28.5 D17.4 D31.7 D31.7 BC 91 FF FF
Open selective replicate OPNyr Negative K28.5 D17.4 AL_PD D31.7 BC 91 AL_PD FF
Close CLS Negative K28.5 D5.4 D21.5 D21.5 BC 85 B5 B5
Dynamic Half Duplex DHD Negative K28.5 D10.4 D21.5 D21.5 BC 8A B5 B5
Mark MRKtx Negative K28.5 D31.2 MK_TP AL_PS BC 5F MK_TP AL_PS