Notes For Figure 8 - Seagate ST446452W Product Manual

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8.1.1

Notes for Figure 8

Notes explaining the functions of the various jumpers on jumper header connectors J01, J4A and J4B are
given here. The term "default" means as standard OEM units are configured with a jumper on those positions
when shipped from factory. "Off" means no jumper is installed; "On" means a jumper is installed. OFF or ON
underlined is factory default condition.
Function description of configuration jumpers
J4A jumpers Jumper function description
A , A , A , A SCSI ID jumpers. Drive ID address on the SCSI bus from 0 to 15 established by these
3 2 1 0
jumpers as shown. Default is Drive ID = 0. ID = 7 is highest priority which is usually the
SCSI host adapter. Priorities go ID7 to ID0, then ID15 to ID8.
WP
On Entire drive is write protected.
Off Drive is not write protected. (Default)
TE
On On-board (non-removable) terminator circuits are enabled. (Default)
Off On-board (non-removable) terminator circuits are disabled.
J4B Jumpers
DS ME
Off Off Spindle starts immediately after power up. (Default)
Off On Spindle does not start until a Start Unit command is received from the host.
On Off Startup is delayed by SCSI ID times 12 seconds after power is applied. For example:
Drive with SCSI ID of 0 starts the spindle immediately when DC power is connected,
drive with SCSI ID of 1 starts after a 12-second delay, drive with SCSI ID of 2 starts
after 24-second delay, etc. Tolerance is plus 3 seconds, minus 0 seconds.
On On Spindle starts when the host sends a Start Unit command. Delayed start feature is over-
ridden and does not apply when the ME jumper is installed.
PD
On SCSI parity checking and parity error reporting by the drive is disabled.
Off Drive checks for parity and reports the results of parity checking to host. (Default)
J01 Jumpers [1]
No jumpers on No terminator power is connected to the drive terminators or the SCSI bus I/O cable.
2-4 Drive terminator power comes from SCSI bus.
1-3 and Drive supplies terminator power to itself (internal connection) and to the SCSI bus I/O
2-4 cable.
1-2 Terminator power is supplied from the drive's internal power to the drive's internal termi-
nators only.
[1] See Table 11 for the I/O connector (J6) pins used for Termpower.
Elite 47 Product Manual, Rev. A