FUJITSU C150-E049-02EN - Manual (Page 56)

M3099GX/GH OEM Manual 3-23
INTERFACE
DATA IN Phase
The DATA IN phase allows the target to request that data be sent to
the initiator from the target.
The target shall assert the I/O signal and negate the C/D and MSG
signals during the REQ/ACK handshake(s) of this phase.
DATA OUT Phase
The DATA OUT phase allows the target to request that data be sent
from the target to the initiator.
The target shall negate the C/D, I/O, and MSG signals during the
REQ/ACK handshake of this phase.
STATUS Phase
The STATUS phase allows the target to request that status
information be sent from the target to the initiator.
The target shall assert the C/D and I/O signals and negate the MSG
signal during the REQ/ACK handshake of this phase.
Message Phase
The message phase is a term that references either a MESSAGE IN,
or a MESSAGE OUT phase. Multiple messages may be sent during
either phase. The first byte transferred in either of these phases shall
be either a single-byte message or the first byte of a multiple-byte
message. Multiple-byte messages shall be wholly contained within a
single message phase.
MESSAGE IN Phase
The MESSAGE IN phase allows the target to request that message(s)
be sent to the initiator from the target.
The target shall assert the C/D, I/O, and MSG signals during the
REQ/ACK handshake(s) of this phase.
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