B-3
Themis Computer
B—DIP-Switch, Jumper-Pin, and Solder-Bead Configurations
Field-Configurable
B.2.2
Baseboard Jumper Pins
Jumper pins are found only on the
top side (component side)
of the USPII
e
-USB
Baseboard and are described in
Table B-1
.
In
Table B-1
, an
ON
jumper position means the jumper is installed, shorting the pins
and completing the circuit.
OFF
means there is no jumper installed, hence the path
between the pins is open, breaking the circuit.
Table B-1.
Baseboard Jumper-Pin Settings (Top Side)
Jumper
Pins
Jumper
Position
a
Description
JP1401 (see
Table B-2
,
page B-4)
ON
Force Universe II to be the VME system controller (SYSCON).
b
OFF
Autosensing is enabled to determine the Universe II operating mode.
JP1402 (see
Table B-2
,
page B-4)
Short 1–2
VME bus grant in (3) at input of the VME system controller is pulled up, forc-
ing the USPII
e
-USB to be a non-system controller at power-up.
Short 2–3
Setting the VME controller as the system controller is determined by JP1401.
JP1501
ON
Transmit system reset to VME SYSRST.
OFF
DO NOT transmit system reset to VME SYSRST.
JP1601
ON
Enable the USPII
e
-USB to be receptive to the VME system reset (SYSRST).
OFF
USPII
e
-USB will ignore any incoming VME system reset (SYSRST) signal.
JP1801 (see
Table B-3
,
page B-5)
ON
c
Force SCSI A into single-ended (SE) mode when a 3-row VME backplane is
used, and connect SCSI A to VME P2.
OFF
Allow autosense mode to determine if SCSI A bus is SE or differential mode.
JP2201
ON
Flash 0 is writable.
OFF
Flash 0 is NOT writable.
JP2202
ON
Flash 1 is writable.
OFF
Flash 1 is NOT writable.
JP2203
ON
Flash 2 is writable.
OFF
Flash 2 is NOT writable.
Note:
Footnotes are described at the end of
Table B-1
on page B-4.
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