Configuration and Jumper Options
SCSI ID Selection
Up to sixteen devices (the host and fifteen targets) can be attached to the SCSI bus.
These are selected with jumpers on the Option Jumper Block or on Auxiliary Connector J1B
(use either but not both); see the Note below the J1B drawing for J1B usage.
In multiple-device systems, each device must have its own Unique SCSI ID.
The SCSI ID (drive address) jumpers are identified as ID0, ID1, ID2, and ID3.
ID selection is binary, as shown below.
| SCSI ID |
ID3 |
ID2 |
ID1 |
ID0 |
| 0 (Default) |
out |
out |
out |
out |
| 1 |
out |
out |
out |
in |
| 2 |
out |
out |
in |
out |
| 3 |
out |
out |
in |
in |
| 4 |
out |
in |
out |
out |
| 5 |
out |
in |
out |
in |
| 6 |
out |
in |
in |
out |
| 7 |
out |
in |
in |
in |
| 8 |
in |
out |
out |
out |
| 9 |
in |
out |
out |
in |
| 10 |
in |
out |
in |
out |
| 11 |
in |
out |
in |
in |
| 12 |
in |
in |
out |
out |
| 13 |
in |
in |
out |
in |
| 14 |
in |
in |
in |
out |
| 15 |
in |
in |
in |
in |
Interface Termination
An external terminator provides termination for the interface lines.
Suggested end-of-cable terminator: Methode DS2050-01-68D
Terminator Power
If a jumper is installed at W1 (Default), the drive provides terminator power (TERMPWR) to the bus.
If the jumper is omitted, the host system provides TERMPWR.
- Remote LED
A user-supplied LED may be connected to Remote LED (Pins 1 and 2).
Spindle Options
Jumpers at SP0 (Pins 11 and 12) and SP1 (Pins 13 and 14) control the spindle options.
| SP0 |
SP1 |
|
| N |
N |
The drive starts the spindle motor at power-on. (Default) |
| Y |
N |
The drive waits for a Start Unit SCSI command to start the spindle motor. |
| N |
Y |
Spindle start-up is delayed based on SCSI ID address (12 seconds per ID) |
Write Protect
A jumper at WP (Pins 15 and 16) selects the write protect option.
| Jumper |
The drive is write protected. |
| No Jumper |
The drive is not write protected. (Default) |
Parity
A jumper at PTY (Pins 17 and 18) selects the bus parity check option.
The drive always generates parity regardless of this option.
| Jumper |
SCSI interface parity checking disabled. |
| No Jumper |
SCSI interface parity checking on. (Default) |
Spindle Sync Signals
Use of the MSYNC and SSYNC signals is optional.
These signals are used as spindle synchronization reference.
Auxiliary Connector J1B
Note:
J1B is sampled at initialization for jumpers on pins 7-8, 5-6, 3-4, and 1-2 for SCSI ID3, ID2, ID1, and ID0 respectively; these connections (if not jumpered) are then released for the following usages:
A dash character (-) at the end of a signal name indicates that it is asserted at the low level (i.e., active low) and negated at the high level.
Drive Fault (XTFALT-)
Output signal negated (Default); indicates no drive fault.
Output signal asserted; indicates a drive fault condition.
Slave Sync (SSYNC-)
Use is optional; used as spindle synchronization reference.
Remote LED-
Open collector output; used to drive a user-supplied LED to indicate the drive is active.
Ground (GND)
Logic ground; provides signal ground.
+5 Volts (+5V)
5 VDC (1A max); used to drive external LEDs.
Write Protect (FAULT-)
Input signal negated (Default); drive is not write protected.
Input signal asserted; drive is write protected.
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