Seagate Barracuda ST11950N, Product Manual

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Barracuda 1 and 2 Product Manual, Rev. C 49
Block Pins Function
ST11950W and ST12550W J01 1 & 2 Terminator power from the drive
1 & 3 Terminator power to the SCSI bus
2 & 4 Terminator power from the SCSI bus
1 & 3 and Terminator power to the SCSI bus and drive
2 & 4
ST11950WD and ST12550WD J01 1 & 3 Terminator power to the SCSI bus
ST11950W/WD and J4 1 & 2 Write Protect option. Jumper installed write pro-
ST12550W/WD tects the entire disc drive. Default is no jumper.
3 & 4 Delay Motor Start option. Jumper installed causes
the drive to wait ten (10) seconds for each target
ID number before starting the spindle automati-
cally. Default is no jumper.
Example:
Target ID is equal to three (3)
3 X 10 = 30
Target spindle motor starts after
thirty (30) seconds
5 & 6 Enable Motor Start option. Jumper installed
causes the target to wait for the Start Unit com-
mand from the SCSI host. No jumper installed
causes the unit to start according to the Delay
Motor Start option (J4 pins 3 and 4). Default is no
jumper.
7 & 8 Parity Disable option. Jumper installed causes
parity checking and error reporting to be dis-
abled. Default is no jumper.
9 & 10 Reserved
11 & 12 Enable Drive Terminator. Jumper installed en-
ables the Drive Terminator. Default is no jumper.
13 & 14 Reserved
J5 1 & 2* SCSI ID bit 0
3 & 4* SCSI ID bit 1
5 & 6* SCSI ID bit 2
7 & 8* SCSI ID bit 3
9 & 10 Remote LED connector
Pin 9 is cathode (negative)
Pin 10 is anode (positive) and is current
limited through a 1K ohm, 1/10W resistor
11 & 12 Spindle sync cable connector
Pin 11 is SSREF+
Pin 12 is ground
*See Figure 19 to set the SCSI ID.