Ultrastar 2XP
Jumper settings |
Models: DCHS-34550, 39100 |
Option Jumper Blocks: |
50 Pin Single Ended Drive
68 Pin Single Ended Drive
68 Pin Differential Drive
SCA-2 Single Ended
68 Pin Auxiliary Connector
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Descriptions: |
SCSI ID Address Settings
Pin Descriptions
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Auto start and delay pins
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-start, a SCSI start unit command is required to make the drive spin and be ready for media access operations. When in auto-start
mode, the drive will delay its start time by a period of time multiplied by its own SCSI address. |
Write protect pin
If the write protect pin is jumpered to ground, the drive will prohibit SCSI commands that alter the customer data area portion of the media from being performed. The state of this pin is
monitored on a per command basis. See the Ultrastar 2XP interface specification for functional details. |
Option block mode pin
The option block mode pin is used to modify the function of the front option jumper block. When the option block mode pin is grounded the pins (25, 27, 29, 31) will be redefined to control
what is referred to as 'alternate mode'. Alternate mode is reserved for future use. |
Disable T.I. sync. negotiation pin
If a disable target initiated synchronous negotiation pin is grounded then an initiator is required to start a negotiation handshake if synchronous and/or wide (double byte) SCSI transfers
are desired. Please refer to the Ultrastar 2XP interface specifications for more details on this feature. |
Disable SCSI parity pin
Grounding this pin will disable SCSI parity checking. |
Disable unit attention pin
Grounding this pin will disable the drive from building unit attention sense information for commands immediately following a power on reset (POR) or SCSI bus reset. Any pending unit
attention conditions will also be cleared at POR or SCSI reset times. |
Customizing pin
The customizing pin is currently reserved for future use. |
Enable narrow mode
Jumpering pin 13 to 14 will cause the 68 pin differential or the 80 pin SCA-2 to operate in a single byte mode. The drive will not negotiate for "wide" (double byte) operation.
The drive will terminate the unused upper byte and upper byte parity on the SCSI bus. |
Enable active termination
Single ended 50 and 68 pin models are available with on card SCSI bus active terminators. The active termination feature can be enabled by installing a jumper between pins 13 and 14 of the
front option jumper block or connecting pins 9 and 11 of the auxiliary connector on 68 pin SCSI models. SCA-2 80 pin and 68 pin differential have no termination.
Note: The Termination power enable block must have a jumper between pins 1 and 2 in order to use Enable active termination. |
Termination power enable
Termination power is optionally provided for systems that need active termination. In order to use the termination power, the user needs to install a jumper between pins 1 and 2 of the
Termination power enable block. The jumper should only be installed on one device, which should be the last device on the SCSI bus (i.e. the drive that is physically closest to a
terminator). |
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