Seagate HAWK 4, Product Manual

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Product Manual - Hawk 4 Family SCSI-2 (Volume 1), Rev. F 31
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Notes for Figure 10.1-1:
[1] Notes explaining the functions of the various jumpers on jumper header connectors J2, J5 and J6 are
given below in left to right order of jumper position. The term “default” means as standard OEM units
are configured when shipped from factory. “Off” means no jumper is installed; “On” means a jumper is
installed. Off or on underlined is factory default condition.
[2] The "ND" model does not have terminators on the drive PCB, so these jumpers are not applicable.
[3] Reserved usage. Do not install a jumper.
J2
Jumper
Installation
Jumper Function Description
TE (Applies only to "N" models)
On With the jumper installed, the On-board (non-removable) terminator circuits are enabled
(connected to the I/O lines). Default is jumper installed.
Off Terminator circuits not connected to I/O lines.
DS ME
Off Off Spindle starts immediately after power up - Default setting.
Off On Drive spindle does not start until Start Unit command received from host.
On Off Spindle Startup is delayed by SCSI ID times 12 seconds after power is applied, i.e., drive 0
spindle starts immediately when DC power connected, drive 1 starts after 12 second delay,
drive 2 starts after 24 second delay, etc.
On On Drive spindle starts when Start Unit command received from host. Delayed start feature is
overridden and does not apply when ME jumper is installed.
WP
On
Entire drive is write protected.
Off Drive is not write protected. Default is no WP jumper installed.
PE
On
Parity checking and parity error reporting by the drive is enabled. Default is PE jumper
installed.
Off Drive does not report result of parity checking to host.
SS
Off
Reserved jumper position. Default is no jumper installed.
TP TP
Off Off No terminator power is connected to drive terminators or SCSI bus I/O pin 26.
On Off Drive supplies its own terminator power only. Jumper on this position is factory default.
Off On Drive supplies power to I/O pin 26 of SCSI bus; none to internal terminators. When drives have
differential I/O circuits, a jumper on the right TP position may be needed to power external
terminators (see system documentation). The ST15230ND drive has differential I/O circuits
which have no terminator circuits on the drive.
On On Drive supplies terminator power to itself (internal connection) and to I/O pin 26 of SCSI bus.
This is a legal jumper setting.