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A phase ends when the C/D, I/O, or MSG signal changes after the negation of the
ACK signal. The time between the end of a phase and the assertion of the REQ
signal beginning a new phase is undefined. An initiator is allowed to anticipate a
new phase based on the previous phase, the expected new phase, and early
information provided by changes in the C/D, I/O, and MSG signals. However, the
anticipated phase is not valid until the REQ signal is asserted at the beginning of
the next phase.
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True I/O Signal: from drive to initiator
False I/O Signal: from initiator to drive
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0 0 0 DATA OUT Initiator to drive.
Allows the drive to request that data be
sent from the initiator to the drive.
0 0 1 DATA IN Drive to initiator.
Allows the drive to send data to the
initiator.
0 1 0 COMMAND Initiator to drive.
Allows the drive to request a command
from the initiator.
0 1 1 STATUS Drive to initiator.
Allows the drive to send status
information be sent from the drive to
the initiator.
1 1 0 MESSAGE OUT Initiator to drive.
Allows the drive to request that
message(s) be sent from the initiator to
the drive; the drive invokes this phase
in response to the attention condition
created by the initiator.
The drive handshakes byte(s) until the
ATN signal is negated, except when
rejecting a message.
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1 1 1 MESSAGE IN Drive to initiator.
Allows the drive to send message(s) to
the initiator.
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