| 0661-371 |
| Jumper settings |
Electrical connectors
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| Electrical connectors (view from
back of disk drive) |
Jumper settings |
The jumper block is used to select the
SCSI device ID, to control the spindle motor start and to select the
appropriate option pin function. There are four ground pins, V, W,
X, Y. If the option pin is jumpered to ground, drive initiated
synchronous negotiation is disabled, but requests from the initiator
will still be accepted. Option block ground pins must only be used
for selecting jumper block functions. |
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| Figure 1 Option Block |
With the remote start jumper in place
the motor spins up when power is applied. With the remote start
jumper removed the motor spins up when the drive is issued a start
unit command.
During the power up sequence the
option pin is interrogated. If it is grounded the pin remains an
input. If it is not grounded it becomes an output, indicating motor
active or command active depending on the state of the CMDAC bit in
mode select page 0.
Note: As an input the option
pin has several effects upon the SCSI function. Please refer to the
0661 SCSI specification for details. |
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