Fujitsu MBA3073 SERIES Technical Manual page 127

e) the last SPI data stream information unit.
At completion of those SPI information units the I_T_L_Q nexus becomes an I_T nexus. The I_T
nexus remains in place until the TARG does a physical disconnect or an I_T_L_Q nexus is
reestablished by the TARG transmitting a SPI L_Q information unit.
Logical reconnections occur on the successful TARG transmission and INIT receipt of a SPI L_Q
information unit for an existing I/O process. The logical reconnection reestablishes the I_T_L_Q
nexus for that I/O process.
SCSI devices using information unit transfers may receive several commands during an initial
connection. This occurs when an INIT uses the multiple command option in the SPI L_Q
information unit.
For each SPI L_Q received with a multiple command type or a last command type a logical
connection occurs and an I_T_L_Q nexus is formed.
If there is a phase change to a MESSAGE OUT phase or a MESSAGE IN phase then there is no
logical disconnect and the I_T_L_Q nexus remains in place. If a DT DATA phase follows the
message phase then the L_Q portion of the current I_T_L_Q nexus shall be replaced with the L_Q
in the next SPI L_Q information unit.
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