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(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
"0"* (Prohibited):If it is necessary to establish wide mode data transfer, the IDD does not
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):
"0" (No Report): The IDD terminates all commands that are received normally.
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.
send the WDTR message. However, if the INIT sends the WDTR
message, the IDD responds normally.
* Set at shipping time
The IDD reports a CHECK CONDITION status (Standard SCSI
specification) in response to commands other than INQUIRY and
REQUEST SENSE.
CHECK CONDITION status which causes a UNIT ATTENTION
condition is not reported.)
* Set at shipping time
C141-E039-01EN
(A
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