Fujitsu MAW3073 SERIES Specifications page 180

d. Transfer mode setup from IDD to INIT
When the synchronous data transfer mode is allowed by the CHANGE DEFINITION
command, the IDD shall execute one of the following operations if the INIT still continue the
default transfer mode.
(a) When the ATTENTION condition has been generated:
If an ATTENTION condition exists before the COMMAND phase and if the INIT does not
send the SYNCHRONOUS DATA TRANSFER REQUEST message after the end of
COMMAND phase, the IDD shall try to select the synchronous data transfer mode by sending
the SYNCHRONOUS DATA TRANSFER REQUEST message to the INIT.
Table 2.6 shows the contents of the SYNCHRONOUS DATA TRANSFER REQUEST
message sent from the IDD and the data transfer mode set to the IDD and INIT by the response
of this message from the INIT. If the INIT does not respond as defined on Table 2.6, the IDD
assumes that the synchronous data transfer is unavailable and selects the asynchronous data
transfer mode between the IDD and the INIT.
If an ATTENTION condition has occurred in the COMMAND phase and if the IDD has
entered the BUS FREE phase or STATUS phase as the result of MESSAGE OUT phase
operations, the default transfer mode of the INIT continues when the IDD cannot send the
SYNCHRONOUS DATA TRANSFER REQUEST message.
(b) When the ATTENTION condition has not been generated:
If the ATTENTION condition does not exist, the IDD does not send the SYNCHRONOUS
DATA TRANSFER REQUEST message to the INIT. In this case, data is transferred in the
asynchronous transfer mode. The default transfer mode of the INIT is released.
2-22 C141-C011