Barracuda 36ES2 Product Manual, Rev. B

41

8.1.2Function description

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—Defaultsetting.

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.

[1]See Figure 13 for pins used for Termpower.

[2]See Figure 14 for pins used for Termpower.

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Seagate ST336918N, ST318418N, ST318438LW, ST336938LW manual Barracuda 36ES2 Product Manual, Rev. B Function description