| Auto Start and Delay Start 6/12 pins (position #3-4 and #5-6 on J6) |
| These pins control when and how the drive spins up with the combination
of Position #1-2 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. Placing a jumper on delay start 6/12 results in a start up delay
of 12 seconds times the SCSI ID. |
Disable SCSI Parity Check (position #7-8 on J6) |
| Installing
a jumper disables SCSI Parity checking. |
Enable TI-SDTR (position #9-10 on J6) |
| Installing a jumper enables Target Initiated Synchronous Data Transfer
Request (SDTR) and Wide Data Transfer Request (WDTR) negotiation. If this
jumper is not installed, SSM (Synchronous select Mode) bit in Mode Page
0 controls Target Initiated SDTR and WDTR negotiation. If this jumper is
installed, SSM bit is ignored. |
Disable Unit Attention (position #11-12 on J6) |
| Installing
a jumper enables control of UAI (Unit Attention Inhibit) bit in Mode
Page 0. |
LED pins (position #1-2 on J4) |
| 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 (position #5-6 on J4) |
| If a jumper is installed, the drive functions as a single-ended mode drive. |
Term Power (position #3-4 on J4) |
| 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. |
 |
|
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).
|
|
|
Terminators |
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)
|
|
|
