C141-E039-01EN
3 - 15
(1)
Header
a) Bytes 0 to 2
X '00' must be specified in this field.
b) Parameter Length
The parameter list length in byte 4 and subsequent bytes which follows the header must be
specified in this field. The parameter list length supported by the IDD is X '04' and the
INIT must not specify a value other than X '04' in this field. If a value other than X '04' is
specified, this command is terminated with a CHECK CONDITION status (ILLEGAL
REQUEST [=5] / Invalid field in parameter list) [=26-00] and the operation mode are not
changed.
(2)
Parameter List
a) WDTR
(wide data transfer request: Effective for devices which support 16 bit SCSI
only.)
This specifies whether or not a wide mode data transfer request from the IDD is permitted.
"1" (Permitted): After the power is switched on, after a RESET condition occurs or when
the first command is received following reception of a BUS DEVICE
RESET message, if a WIDE DATA TRANSFER REQUEST (WDTR)
message is not sent by the INIT, the IDD sends the WDTR message and
attempts to establish wide mode data transfer.
"0"* (Prohibited):If it is necessary to establish wide mode data transfer, the IDD does not
send the WDTR message. However, if the INIT sends the WDTR
message, the IDD responds normally.
* Set at shipping time
b) UNTATN
(Unit Attention Report Mode)
This specifies the response method to commands received from the INIT when the IDD is
holding a UNIT ATTENTION condition:
"1"* (Report):
The IDD reports a CHECK CONDITION status (Standard SCSI
specification) in response to commands other than INQUIRY and
REQUEST SENSE.
"0" (No Report): The IDD terminates all commands that are received normally. (A
CHECK CONDITION status which causes a UNIT ATTENTION
condition is not reported.)
* Set at shipping time