Fujitsu MAH3091MC - Enterprise 9.1 GB Hard Drive, Maintenance Manual

Page: 90 / 157

C141-E103-01EN 5 - 9
Table 5.5 Setting of the SCSI interface operation mode (CN2)
Operation mode CN2 15-16
Follows the DIFFSNS signal level on the SCSI bus Open *
Single-Ended mode Short
* Set at factory shipment
(5) Setting the bus width of the SCSI interface
By establishing a short-circuit between the 13 and 14 CN2 setting terminals, the bus width for the
SCSI interface is forcibly set to the 8-bit bus mode. This setup terminal must be set in order to
guarantee the physical level of the SCSI interface’s upper bus (DB8-15, P1) inside the IDD only
when the top-level bus (DB8-15, P1) for the IDD SCSI interface is not connected to the external
part of the IDD.
Table 5.6 Setting the bus width of the SCSI interface (CN2)
Bus width CN2 13-14
16 bit bus Open *
8 bit bus Short
* Set at factory shipment
5.3.3 Mode settings
In addition to the previously described settings using setting terminals, the IDD is provided with several
mode settings. The mode settings are enabled by specifying the CHANGE DEFINITION command.
Table 5.7 lists the mode settings and their settings at factory shipment.
Refer to Section 3.1.4 of the SCSI Logical Interface Specifications for details of the command.
Table 5.7 Default mode settings (by CHANGE DEFINITION command)
Mode setting Contents
SCSI level SCSI-2
SYNCHRONOUS DATA TRANSFER REQUEST message sending Sent from IDD
UNIT ATTENTION report mode Reported
Reselection retry count Not restricted
WIDE DATA TRANSFER REQUEST message sending Sent from IDD
Reselection time-out delay 250 ms
Spindle motor start delay time 0 sec (MP)
12 sec × SCSI ID (MC)