Seagate Barracuda ST318418N - Manual (Page 51)

Barracuda 36ES2 Product Manual, Rev. B 41
8.1.2 Function description
[1] See Figure 13 for pins used for Termpower.
[2] See Figure 14 for pins used for Termpower.
J2
jumper
installation
Jumper function description
TE (Applies only to the N models)
On With the jumper installed, the onboard (non-removable) terminator circuits are enabled (con-
nected to the I/O lines).
Off Terminator circuits not enabled (not connected to I/O lines). Default is jumper installed.
SE (Applies only to the LW model)
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,
depending on the voltage state of the I/O “DIFFSNS” line. Default is SE jumper not installed.
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 times12 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 WP jumper not installed.
PD
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.
TP1 (Applies only to the LW and N models)
Off No terminator power is connected to SCSI bus I/O cable [1]. No jumpers on is factory default.
On Drive supplies power to SCSI bus I/O cable [1]. A jumper on the TP1 position may be needed
to power external terminators (see Section 9.8 and Figure 21).
TP2 (Applies only to the N models)
On Connects terminator power to the drive’s internal terminators [2] (for single-ended I/O only).
Off No power is connected to the drives internal terminators. Default is jumper installed.