The first four set of pins are the ID settings. These
usually follow the same rule as the example shown on the last page. However,
this drive goes from 0 to 3. After that you see a 1 pin. This is known as a key.
It separates the drives other functions. The one after the key is Autostart.
This will autospin up the drive
as soon as it turns on. Some SCSI controllers do not like this though, so you
can experiment with it. Personally, I leave it off. The next 3 from the key are
reserved from the factory. Just ignore them.
Here are the next set of pins:
External Activity (LED) Pin
The 2 pins can be used to drive an external Light Emitting Diode. However, most
SCSI controllers have the pins needed for driving LED's so this is not used.
Auto Start Delay
The Auto Start and Auto Start Delay pins control when and how the drive can spin
up and come ready. When configured for Auto-Startup, the motor spins up
after power is applied without the need of a SCSI Start Unit command. For no
Auto-Startup, a SCSI Start Unit command is required to make the
drive spin and be ready for media access operations. When in Auto-Start Delay
mode, the drive will delay its start time by a period of time multiplied by its
SCSI address.
Write Protect Pin
If the Write Protect pin is jumpered, the drive will prohibit commands that
alter the customer data area portion of the drive from being performed.
This pin is not used.
Disable Synchronous Negotiation Pin.
If this is jumpered then an Initiator is required to start a negotiation
handshake if wide transfers (16 bit) are desired. This pin is not used.
Disable SCSI Parity Pin
If jumpered, this pin will disable SCSI parity checking. Similar to our CD-ROM
drive example above.
Disable Unit Attention Pin
Jumpering this pin will disable the drive from building Unit Attention Sense
information for commands immediately following a Power On Reset or SCSI Bus
Reset. This pin is not used.
Disable Wide Negotiations
Jumpering this pin will cause the drive to operate in single byte mode. The
drive will not negotiate wide operation. This is to be jumpered for using the
drive on a SCSI-2 bus.
Force Single-Ended Mode
This will cause the 68 pin LVD drive to operate in single ended
mode only. Jumper this pin if you are using this drive on a UW or SCSI-2
controller. Note that the drive will not function to its full performance.
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