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When the SCSI bus is between two information transfer phases, the following
restrictions apply to the SCSI bus signals:
• The BSY, SEL, REQ, and ACK signals do not change.
• The C/D, I/O, MSG, and DATA BUS signals can change.
• When changing the DATA BUS direction from out (initiator-driving)
to in (drive-driving), the drive delays driving the DATA BUS by at
least a data release delay plus one bus settle delay after asserting the
I/O signal. The initiator releases the DATA BUS no later than a data
release delay after the transition of the I/O signal to true.
• When switching the DATA BUS from in to out, the drive releases the
DATA BUS no later than a deskew delay after negating the I/O signal.
• The ATN and RST signals can change as defined under the
descriptions for the attention condition (Section 3.6.1) and reset
condition (Section 3.6.2).