Status Phase; Message Phase; Data Transfer Rate In Synchronous Mode - Fujitsu MAN3184 SERIES Specifications

1.6.8

STATUS phase

In a STATUS phase, the TARG requests to transfer status information from the TARG to the
INIT. The TARG keeps the C/D and I/O signals true and the MSG signal false during REQ/ACK
handshaking in this phase.
1.6.9

MESSAGE phase

The MESSAGE phase is divided into MESSAGE IN and MESSAGE OUT phases depending on
the direction of message information transfer. In either phase, several messages can be transferred.
The first byte transferred in a MESSAGE phase must be a single-byte message or the first byte of a
multiple-byte message. If the message consists of more than one byte, all bytes must be transferred
in a single MESSAGE phase. For details of message types and their operation, refer to Chapter 2.
(1) MESSAGE IN phase
In a MESSAGE IN phase, the TARG requests to transfer message information from the TARG to
the INIT. The TARG keeps the C/D, I/O, and MSG signals true during REQ/ACK handshaking in
this phase.
(2) MESSAGE OUT phase
In a MESSAGE OUT phase, the TARG requests to transfer message information from the INIT to
the TARG. The TARG keeps the C/D and MSG signals true and I/O signal false during
REQ/ACK handshaking in this phase.
The TARG executes this phase in response to the ATTENTION condition (described in Section
1.7.1) created by the INIT, and must remain in the MESSAGE OUT phase.
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Figure 1.30 Data transfer rate in synchronous mode
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