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7.6 Bus Phases
C156-E228-02EN 7-27
7
Bus Settle Delay (Min)
Figure 7.13 INFORMATION TRANSFER phase (phase control)
1. After the ACK signal becomes false during the
INFORMATION TRANSFER phase, the TARG can begin to
prepare for a new phase by changing the status of C/D, I/O, and
MSG signals. The status of these three signals can change in
any order or at once. The status of one signal may change more
than once; however, the TARG should change the status of each
signal only once.
2. Note that a new INFORMATION TRANSFER phase starts
when the REQ signal that requests transfer of the first byte in
the phase becomes true. The phase ends when one of C/D, I/O,
or MSG signal changes after the ACK signal becomes false. The
period between the time one phase ends and the time the REQ
signal to initiate the next new phase becomes true is not defined.
3. The INIT can predict the next new phase (expected phase) from
the status change of C/D, I/O, and MSG signals or from the type
of the preceding execution phase executed. However, note that
the expected phase does not come into effect until the REQ
signal becomes true.