Jumper Signal Description On 68 Pin Jumper Block; Led Driver Out (Position 1-2); Enable Termination Power (Positions 3-4); Force Single Ended Mode (Position 5-6) - Hitachi HUS151473VL3800 - Ultrastar 73.4 GB Hard Drive Specifications

7.10 Jumper signal Description on 68 pin Jumper Block

7.10.1 LED Driver Out (position 1-2)

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 +5V source provided on pin 1 on J4 jumper block.
The LED Cathode is then connected to the pin 2 on J4 jumper block to complete the circuit.
+5V
150 Ohms

7.10.2 Enable Termination Power (positions 3-4)

If a jumper is installed, termination power is supplied to pins 17, 18, 51, and 52 of the 68-pin SCSI interface.

7.10.3 Force Single Ended Mode (position 5-6)

If a jumper is installed, the drive functions as a single-ended mode drive.

7.10.4 Positions #7-8 to #13-14: Device ID

These four lines define the device ID on the SCSI BUS. ID 0 is the least significant bit and ID 3 is the most significant bit.
Device ID is defined in the table below. In the table, "on" means a jumper is installed and "off" means that no jumper isin-
stalled.
Table 17: SCSI Device ID
ID 3 ID 2
OFF OFF
OFF OFF
OFF OFF
OFF OFF
OFF ON
OFF ON
68 pin
150 Ohms
ID 1 ID 0
OFF OFF
OFF ON
ON OFF
ON ON
OFF OFF
OFF ON
Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
Position #1 , 2 on J-4 Jumper Block
(pin 1 of J-4 ) to LED Anode
(pin 2 of J-4 ) to LED Cathode
Device ID
0
1
2
3
4
5
29