Specifications

Selecting the Reset jumper position will cause the board to be reset when the front panel switch
is operated. If the board is in the System Controller Slot, it will also assert RST# on the VME
backplane and hence reset the other boards in the chassis. If the board is operating in any other
slot, it will respond to front panel resets and also to the assertion of the VME SYSRST
signal.
Selecting the NMI jumper position configures the switch to generate NMI when operated. No
reset is generated in this case. The board will still be reset by the VME backplane SYSRST
or
EXTRST
signals if they are asserted.
2.4.7 External Reset
The External Reset input is also available on a front panel connector. This will cause a board
reset in the same way as the front panel switch. This input consists of two small sockets one for
connection of the reset input and the other ground reference. This input can be driven from an
open collector TTL output (or discrete transistor) or normally open switch/relay contacts. To
initiate the reset connect these inputs. This input is filtered, and protected from polarity and
overshoots/undershoots so no external contact debouncing is required.
VP 110/01x 2-5
Hardware Installation
Switch 3 - Front Panel Switch Function
ON - Reset (Default)
OFF - No Action
Switch 4 - Front Panel Switch Function
ON - NMI
OFF - No Action (Default)
ON
OFF
1
2
3
4
Figure 2-3 Front Panel Reset and NMI Switch