Seagate ST43402ND user manual ST43401N/ND control board jumpers, Spindle, Sync Pins

24 ST43401N/ND, ST43402ND User’s Manual, Rev. B

Write Protect/Enable (WRT)

Fault LED connector

Ready LED connector

Slave Select (SLV)

J4A WRT SLV

Write Protect/Enable (WRT)

Write protect (disable writing)

Write enable (enable writing)

Slave Select (SLV)

Master (master drive for spindle sync)

Terminator Resistor-Paks (3) (must be installed if drive is at either end of the daisychain)

Pin 1

Pin 1

Pin 1

=Jumper connected

=Jumper not connected

=Non-applicable jumper (not relevant to the option discussed)

Slave (slave drive unless selected as the master by a SCSI command)

Spinup Delay Option (SDO)

Start Command Option (SCO)

ID3

ID2

ID1

ID0

Unit Selectors

SCSI Bus Parity Check Option (SCPAR)

Sweep Cycle Option (SWP)

SDO SCPAR

SCO SWP

Motor (MTR)

Ground (GND)

Key (no pins)

Spindle Sync Clock – (SSCLK–)

Spindle Sync Clock + (SSCLK+)

	ID3 ID1 MTR	Spindle
J7	ID2 ID0	Sync Pins

SCSI Unit Selectors

Unit Select ID = 0

Unit Select ID = 1

Unit Select ID = 2

Unit Select ID = 3

Unit Select ID = 4

Unit Select ID = 5

Unit Select ID = 6

Unit Select ID = 7

Unit Select ID = 8

Unit Select ID = 9

Unit Select ID = A

Unit Select ID = B

Unit Select ID = C

Unit Select ID = D

Unit Select ID = E

Unit Select ID = F

J4B

Spinup Delay Option (SDO)

Immediate spinup

(if the Start Command Option jumper is disconnected)

Spinup delay equal to the SCSI bus ID multiplied by 10 seconds (if the Start Command Option jumper is disconnected)

Start Command Option (SCO)

Start spindle according to the Spinup Delay

Option jumper

Start spindle after the SCSI bus sends a Start

Unit command

SCSI Bus Parity Check Option (SCPAR)

Enable parity check of SCSI bus data

Ignore parity

Sweep Cycle Option (SWP)

Disable sweep cycles (recommendation – sweep cycles should be enabled at the system or subsystem level)

Enable sweep cycles at the drive level

4	J01
2
3
Terminator Power Source Jumper
1	2	4
	1	3

Assign the terminal power jumpers as shown below.

Internal terminator power source.

External terminator power source.

Internal terminator power to I/O.

Figure 8. ST43401N/ND control board jumpers