9.1.2Function description
J6 |
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jumper |
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installation | Jumper function description | |
SE |
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On |
| Forces drive to use |
Off |
| Drive can operate on the interface in low voltage differential mode or |
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| ing on the voltage state of the I/O “DIFFSNS” line. Default is SE jumper not installed. |
DS | ME |
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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 |
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| spindle starts immediately when DC power connected, drive 1 starts after 12 second delay, |
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| drive 2 starts after 24 second delay, etc. |
On | On | Drive spindle starts when Start Unit command received from host. Delayed start feature is |
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| overridden and does not apply when ME jumper is installed. |
WP |
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On |
| Entire drive is write protected. |
Off |
| Drive is not write protected. Default is WP jumper not installed. |
PD |
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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. |
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| Default is PD jumper not installed. |
RES |
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Off |
| Reserved jumper position. Default is no RES jumper installed. |
TP |
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Off |
| The drive does not supply terminator power to external terminators or to the SCSI bus I/O |
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| cable. |
On |
| Drive supplies power to SCSI bus I/O cable. When drives have differential I/O circuits, a |
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| jumper on the TP position may be needed to power external terminators (see system docu- |
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| mentation). These drives do not have terminator circuits on the drive. |
Note. | J6 does not exist on the LC model and is supported on the LW model only. | |
42 | Cheetah 15K.5 SCSI Product Manual, Rev. J |
