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Ultrastar 18XP and 9LP models contain a jumper block that can be used to enable
certain features and select the SCSI ID of the drive. This jumper block is referred to as
the 'Front' Option Jumper Block due to its location on the drive (opposite the SCSI
connector). This jumper block varies in pin definition based on interface type (50, 68,
Differential, SCA-2). Jumper position and function are as shown below. Pin pitch is
2 mm. Termination power enable 2.54 mm pitch. |
See the following topic for additional installation information: |
Installation notes for LVD drives
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Option Jumper Blocks: |
50 Pin Single Ended Drive
68 Pin Single Ended and Low Voltage Differential
Drive
SCA-2 Single Ended or Low Voltage Differential Drive
68 Pin Differential Drive
68 Pin Auxiliary Connector
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Descriptions: |
SCSI ID Address Settings
Pin Descriptions
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| Note: LVD drives do not use the termination power enable jumpers. |
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| Note: Addresses 8-15 only apply to 68 and 80 pin models. |
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| Notes: |
- Either the Front Option Block OR the Auxiliary block may be used
but not both.
- The signal pins on the auxiliary connector are single wire inputs. Jumpers are
not used on this connector.
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The 68 pin models contain an auxiliary connector that replicates some of the functions
contained in the Front Option Jumper Block. The auxiliary connector signal
definition conforms to the SCSI document: SFF-8009 Rev 2.0 definition with the following
exceptions: |
- EXTERNAL FAULT (XTFALT-) is not supported on pin2.
- AUTO SPIN START was chosen as the vendor unique signal assignment on pin 4. This
signal is an input to the drive. The SCSI document SFF-8009 specifies this pin is an
output. This signal should be used for applications that want to 'auto-start' the
drive based on location dependent SCSI ID.
This pin should be handled in one of the following ways:
- Tied to ground (auto spin start enabled)
- Allowed to float (no connections)
- Driven with an open collector driver (greater than 1 milliampere sink capability)
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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. |
Auto startup modes selectable by auto-start/delay pin combinations
Note: The on condition indicates that a jumper is in place to the adjacent
ground pin. The off condition indicates that no jumper is in place. |
| External activity (LED) pins |
| The LED pins can be used to drive an external light emitting diode. Please refer to
the LED pin section of the Ultrastar 9LP/18XP interface specification for a detailed
functional description of this pin. Up to 33 mA (+/-5%) of TTL level LED drive
capability is provided. Current limiting for the LED is provided on the electronics card.
The LED anode may be tied to the +5V source provided on pin 18 of the front option jumper
block, pin 11 of the auxiliary connector on the 68 pin unitized connector or the 5V power
source on the 80 pin SCA model. The LED cathode is then connected to the external activity
pin to complete the circuit.
Note: 68 pin and 80 pin SCA SCSI models have two sets of pins, a set on the
front and a set on the back, that are connected to the same LED driver circuit. The
combined drive capability is stated above. |
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 9LP/18XP interface
specification for functional details. |
Disable 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. |
Disable wide negotiations |
| Jumpering pin 31 to pin 32 will cause the 68 pin SE, 80 pin SCA-2, 68 pin
differential, or the 80 pin and 60 pin low voltage differential models to operate in a
narrow (single-byte) mode. The drive will not negotiate for wide (double-byte)
operation. |
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 10 of the
auxiliary connector on 68 pin SCSI models. SCA-2 80 pin and 68 pin differential have no
termination. |
Force single ended mode (LVD only) |
| Jumpering pin 23 to pin 24 will cause the 68 pin and 80 pin SCA-2 low voltage
differential models to operate in a single ended mode only. The drive will not use
the DIFFSENS line to determine SE or LVD modes. |
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