| Enable Auto Spin (68-pin models) |
| If a jumper is installed, the drive will spin up automatically after power on reset. If a jumper is not installed, the drive will not spin up unless a START UNIT command is received. |
Disable Auto Spin (80-pin models) |
| If a jumper is not installed, the drive will spin up automatically after power on reset. If a jumper is installed, the drive will not spin up unless a START UNIT command is received. |
Auto Start and Delay Start 6/12 pins |
| These pins control when and how the drive spins up with the combination of Position #5 on J6. When both Auto Spin up and Auto Start Delay are enabled, the drive start will be delayed
by a period of time multiplied by its own SCSI address. If Auto Spin up is disabled, these jumpers will be ignored. Throughout this paragraph 'on' means a jumper is installed
and 'off' means that no jumper is installed. |
Disable SCSI Parity Check |
| Installing a jumper disables SCSI Parity checking. |
Enable TI-SDTR |
| Installing a jumper enables Target Initiated Synchronous Data Transfer Request Negotiation. |
Disable Unit Attention |
| Installing a jumper enables control of UAI (Unit Attention Inhibit) bit in Mode Page 0. |
LED pins |
| The LED pins are used to drive an external Light Emitting Diode. Up to 30 mA of sink current capability is provided. The LED Anode must be tied to the current limited + 5 V source provided
on the pin for LED Anode at the Location #1 on J4 jumper block. The LED Cathode is then connected to the pin for LED Cathode at the Location #2 on J4 jumper block to complete the circuit. |
Force Single Ended Mode |
| If a jumper is installed, the drive is forced to work as a single-ended mode drive. |
Term Power |
| NC for 80 pin models. If a jumper is installed on 68 pin models, termination power is supplied to pins 17, 18, 51, and 52 of the 68 pin SCSI interface. |
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SCSI Bus Cable |
SE mode:
The maximum cumulative cable length when using a single-ended transceiver should be 3 meters. Implementations that limit the transfer rate to a maximum of 5 megabyte transfers per
second may extend the cumulative cable length to 6 meters. (ANSI SCSI-3 X3T10/855D).
The maximum cumulative signal path between terminators shall be 3.0 meters when using up to 4 maximum capacitance (25pF) devices. The maximum cumulative signal path length between
terminators shall be 1.5 meters when using from five to eight maximum capacitance devices. (ANSI SCSI-3 FAST-20 X3T10/1071D). |
LVD mode:
The maximum cumulative cable length when using an LVD transceiver must comply to the limit, which is defined by ANSI SCSI-3 X3T10/855D.
The maximum cumulative signal path between terminators shall be 12 meters when using up to 4 maximum capacitance (25pF) devices.
The maximum cumulative signal path length between terminators shall be 12 meters when using from five to eight maximum capacitance devices. (ANSI SCSI-3 FAST-20 X3T10/1071D).
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Terminators |
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Onboard SCSI active termination is not supported. The using system is responsible for making sure that all required signals are terminated at both ends of the bus cable. |
Note: LVD versions cannot provide bus termination. However, 68 pin DPSS
versions can be jumpered to provide Terminator Power. |
The following are 68 pin model terminator examples: |
Data Mate DM2750-01-LVD (LVD only)
Amphenol 497040001 (Multimode)
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