Seagate ST34520N Product Manual - Page 50
Jumper Function Description
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40 Medalist Pro Product Manual, Rev. D 8.1.2 Function description J2 Jumper Installation TE On Off Jumper Function Description (Applies only to "N" and "W" models) With the jumper installed, the On-board (non-removable) terminator circuits are enabled (connected to the I/O lines). Default is jumper installed. Terminator circuits not enabled (not connected to I/O lines). SE (Applies only to "LW" and "LC" models) On Forces drive to use single-ended I/O drivers/receivers only. Off Drive can operate on the interface in low voltage differential mode or single-ended, depend- ing on the voltage state of the I/O "DIFFSENS" line. Default is no jumper on. DS ME Off Off Off On On Off On On (Applies to all models) Spindle starts immediately after power up - Default setting. Drive spindle does not start until Start Unit command received from host. 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. Drive spindle starts when Start Unit command received from host. Delayed start feature is overridden and does not apply when ME jumper is installed. PD (Applies to all models) On Parity checking and parity error reporting by the drive is disabled. Off Drive checks for parity and reports result of parity checking to host. Default is PD jumper not installed. RES Off (Applies to all models) Reserved jumper position. Default is no jumper installed. TP2 TP1 Off Off On Off Off On On On (Does not apply to "WC" models) No terminator power is connected to drive terminators or SCSI bus I/O cable*. Drive supplies its own terminator power only. Jumper on this position is factory default. Drive supplies power to SCSI bus I/O cable*; none to internal terminators. When drives have differential I/O circuits, a jumper on the TP1 position may be needed to power external terminators (see system documentation). Drive supplies terminator power to itself (internal connection) and to SCSI bus I/O cable*. This is a legal jumper setting. TP1 and TP2 "Position A" On Off (Applies only to "N" and "W") This horizontally positioned jumper across the two TP positions furthest from the PCB edge, connects terminator power from SCSI bus I/O Termpower cable* to the drive's internal terminators (for single-ended I/O only). See above explanations for TP jumpers. TP (Applies only to "LW" model) Off No terminator power is connected to SCSI bus I/O cable.* Default is no jumpers on. On Drive supplies power to SCSI bus I/O cable.* A jumper on the TP1 position may be needed to power external terminators (see Section 9.8 and Figure 10). *See Figure 12 for pins used for Termpower.