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Command Specifications
3 - 16 C141-E167
Bit
Byte
76543210
0 X‘00’
1 X‘00’
2 X‘00’
3 X‘04’ (Parameter Length)
4000WDTR
UNTAIN
SDTR RSRTY 0
5 PHSCRC AGD ACE 0 0 0 RTD
6 X‘xx’ (Spindle Motor Start Delay Time)
7 X‘00’ (Reserved)
The operation mode parameter is configured from a 4-byte parameter list following a 4-byte header.
(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 16-bit SCSI devices only.)
This specifies whether or not a wide mode data transfer request from the IDD is permitted.
If this bit is set to 1, also set SDTR to 1. If only this bit is set but SDTR is not set, error code 5-
26-00 is returned.
"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.
Header
Parameter
List