Fujitsu MAN3184 SERIES Specifications page 155

Note:
The retry count for the timeout of RESELECTION phase can be set by the CHANGE
DEFINITION command. For details, see Section 1.6.11.
(8) Errors concerning message protocol
If the IDD detects an ATTENTION condition in the SELECTION phase and it receives the
message except for the following messages from the INIT in its response to the ATTENTION
condition (the MESSAGE OUT phase), the IDD considers it as an error in the message protocol
and enters the BUS FREE phase immediately.
IDENTIFY
ABORT TASK
TARGET REST
(9) Internal controller error
If a hardware or firmware error inside of the IDD is detected and if the LUN is already identified,
the IDD abnormally terminates the currently executing command in the CHECK CONDITION
status. In such case, the IDD generates the sense data which indicates the "HARDWARE ERROR
[=4]/Internal target failure [=44-nn]" sense key/sense code. If the LUN is not identified yet, the
IDD does not generate the sense data but enters the BUS FREE phase immediately.
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