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Note:
When the INIT issues the first command after the TARG's power is switched on, or after a
RESET condition occurs, it can send the WIDE DATA TRANSFER REQUEST message
and the SYNCHRONOUS DATA TRANSFER REQUEST message. However, when the
TARG is set internally on a data transfer mode established previously by a BUS DEVICE
RESET message issued by another INIT, generally, the INIT is not aware of it. In such a
case, if the CHANGE DEFINITION command's specification (synchronous mode, wide
mode transfer request) permits the synchronous mode/wide mode transfer request, the
TARG (IDD) will send the WIDE DATA TRANSFER REQUEST message and the
SYNCHRONOUS DATA TRANSFER REQUEST message in order to reestablish
synchronous mode/wide mode transfers, so it is necessary for the INIT change its settings
to the required parameters in response to this message.
See "CHANGE DEFINITION" in 3.1.4, SCSI Bus (INFORMATION TRANSFER Phase) in
Chapter 1 and SCSI Messages (SYNCHRONOUS DATA TRANSFER REQUEST, WIDE
DATA TRANSFER REQUEST) in Chapter 2 of "SCSI Physical Interface Specifications" for
further details.
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C141-E039-01EN
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